diff --git a/cmds/clean/all.js b/cmds/clean/all.js
index b8bcb90b..531de095 100644
--- a/cmds/clean/all.js
+++ b/cmds/clean/all.js
@@ -17,9 +17,11 @@
 
 "use strict";
 
-exports.command = ['all', 'everything'];
-exports.desc = 'Do all cleaning tasks';
+import { e_call } from '../../src/util.js';
 
-exports.handler = async (argv) => {
-  await UTIL.e_call(argv, 'clean/all');
+export const command = ['all', 'everything'];
+export const desc = 'Do all cleaning tasks';
+
+export const handler = async (argv) => {
+  await e_call(argv, 'clean/all');
 };
diff --git a/cmds/clean/autoloads.js b/cmds/clean/autoloads.js
index 4a9dd766..1719e48e 100644
--- a/cmds/clean/autoloads.js
+++ b/cmds/clean/autoloads.js
@@ -17,9 +17,11 @@
 
 "use strict";
 
-exports.command = ['autoloads'];
-exports.desc = 'Remove the generated autoloads file';
+import { e_call } from '../../src/util.js';
 
-exports.handler = async (argv) => {
-  await UTIL.e_call(argv, 'clean/autoloads', argv.dest);
+export const command = ['autoloads'];
+export const desc = 'Remove the generated autoloads file';
+
+export const handler = async (argv) => {
+  await e_call(argv, 'clean/autoloads', argv.dest);
 };
diff --git a/cmds/clean/dist.js b/cmds/clean/dist.js
index dc23a6c9..59428e25 100644
--- a/cmds/clean/dist.js
+++ b/cmds/clean/dist.js
@@ -17,9 +17,11 @@
 
 "use strict";
 
-exports.command = ['dist [destination]', 'distribution [destination]'];
-exports.desc = 'Delete the dist directory where the build output is stored';
-exports.builder = yargs => yargs
+import { e_call } from '../../src/util.js';
+
+export const command = ['dist [destination]', 'distribution [destination]'];
+export const desc = 'Delete the dist directory where the build output is stored';
+export const builder = yargs => yargs
   .positional(
     'destination', {
       description: 'destination path/folder to clean up',
@@ -27,6 +29,6 @@ exports.builder = yargs => yargs
       type: 'string',
     });
 
-exports.handler = async (argv) => {
-  await UTIL.e_call(argv, 'clean/dist', argv.dest);
+export const handler = async (argv) => {
+  await e_call(argv, 'clean/dist', argv.dest);
 };
diff --git a/cmds/clean/elc.js b/cmds/clean/elc.js
index 4c8efaf3..d1a12db9 100644
--- a/cmds/clean/elc.js
+++ b/cmds/clean/elc.js
@@ -17,9 +17,11 @@
 
 "use strict";
 
-exports.command = ['elc'];
-exports.desc = 'Remove byte compiled files generated by eask compile';
+import { e_call } from '../../src/util.js';
 
-exports.handler = async (argv) => {
-  await UTIL.e_call(argv, 'clean/elc');
+export const command = ['elc'];
+export const desc = 'Remove byte compiled files generated by eask compile';
+
+export const handler = async (argv) => {
+  await e_call(argv, 'clean/elc');
 };
diff --git a/cmds/clean/log-file.js b/cmds/clean/log-file.js
index 9b3ba74d..07bb2191 100644
--- a/cmds/clean/log-file.js
+++ b/cmds/clean/log-file.js
@@ -17,9 +17,11 @@
 
 "use strict";
 
-exports.command = ['log-file'];
-exports.desc = 'Remove all generated log files';
+import { e_call } from '../../src/util.js';
 
-exports.handler = async (argv) => {
-  await UTIL.e_call(argv, 'clean/log-file');
+export const command = ['log-file'];
+export const desc = 'Remove all generated log files';
+
+export const handler = async (argv) => {
+  await e_call(argv, 'clean/log-file');
 };
diff --git a/cmds/clean/pkg-file.js b/cmds/clean/pkg-file.js
index 88b50357..9f4ef233 100644
--- a/cmds/clean/pkg-file.js
+++ b/cmds/clean/pkg-file.js
@@ -17,9 +17,11 @@
 
 "use strict";
 
-exports.command = ['pkg-file'];
-exports.desc = 'Remove the generated pkg-file';
+import { e_call } from '../../src/util.js';
 
-exports.handler = async (argv) => {
-  await UTIL.e_call(argv, 'clean/pkg-file');
+export const command = ['pkg-file'];
+export const desc = 'Remove the generated pkg-file';
+
+export const handler = async (argv) => {
+  await e_call(argv, 'clean/pkg-file');
 };
diff --git a/cmds/clean/workspace.js b/cmds/clean/workspace.js
index c7027af3..377991f7 100644
--- a/cmds/clean/workspace.js
+++ b/cmds/clean/workspace.js
@@ -17,9 +17,11 @@
 
 "use strict";
 
-exports.command = ['workspace', '.eask'];
-exports.desc = 'Clean up the .eask directory';
+import { e_call } from '../../src/util.js';
 
-exports.handler = async (argv) => {
-  await UTIL.e_call(argv, 'clean/workspace');
+export const command = ['workspace', '.eask'];
+export const desc = 'Clean up the .eask directory';
+
+export const handler = async (argv) => {
+  await e_call(argv, 'clean/workspace');
 };
diff --git a/cmds/core/analyze.js b/cmds/core/analyze.js
index 6209a42b..b49c6aea 100644
--- a/cmds/core/analyze.js
+++ b/cmds/core/analyze.js
@@ -17,9 +17,12 @@
 
 "use strict";
 
-exports.command = ['analyze [files..]'];
-exports.desc = 'Run Eask checker';
-exports.builder = yargs => yargs
+import { TITLE_CMD_OPTION } from "../../src/env.js";
+import { e_call, def_flag } from '../../src/util.js';
+
+export const command = ['analyze [files..]'];
+export const desc = 'Run Eask checker';
+export const builder = yargs => yargs
   .positional(
     '[files..]', {
       description: 'specify Eask-files for checker to lint',
@@ -39,9 +42,9 @@ exports.builder = yargs => yargs
     },
   });
 
-exports.handler = async (argv) => {
-  await UTIL.e_call(argv, 'core/analyze'
-                    , argv.files
-                    , UTIL.def_flag(argv.json, '--json')
-                    , UTIL.def_flag(argv.output, '--output', argv.output));
+export const handler = async (argv) => {
+  await e_call(argv, 'core/analyze'
+    , argv.files
+    , def_flag(argv.json, '--json')
+    , def_flag(argv.output, '--output', argv.output));
 };
diff --git a/cmds/core/archives.js b/cmds/core/archives.js
index 3f20e2d5..0ee92b08 100644
--- a/cmds/core/archives.js
+++ b/cmds/core/archives.js
@@ -17,9 +17,11 @@
 
 "use strict";
 
-exports.command = ['archives', 'sources'];
-exports.desc = 'List out all package archives';
+import { e_call } from '../../src/util.js';
 
-exports.handler = async (argv) => {
-  await UTIL.e_call(argv, 'core/archives');
+export const command = ['archives', 'sources'];
+export const desc = 'List out all package archives';
+
+export const handler = async (argv) => {
+  await e_call(argv, 'core/archives');
 };
diff --git a/cmds/core/bump.js b/cmds/core/bump.js
index 156f6797..834e9f32 100644
--- a/cmds/core/bump.js
+++ b/cmds/core/bump.js
@@ -17,16 +17,18 @@
 
 "use strict";
 
-exports.command = ['bump [levels..]'];
-exports.desc = UTIL.hide_cmd('Bump version for your project');
-exports.builder = yargs => yargs
+import { e_call, hide_cmd } from '../../src/util.js';
+
+export const command = ['bump [levels..]'];
+export const desc = hide_cmd('Bump version for your project');
+export const builder = yargs => yargs
   .positional(
     '[levels..]', {
       description: "version level to bump; accept `major', `minor' or `patch'",
       type: 'array',
     });
 
-exports.handler = async (argv) => {
-  await UTIL.e_call(argv, 'core/bump'
-                    , argv.levels);
+export const handler = async (argv) => {
+  await e_call(argv, 'core/bump'
+    , argv.levels);
 };
diff --git a/cmds/core/cat.js b/cmds/core/cat.js
index 52d0cb47..20ed1036 100644
--- a/cmds/core/cat.js
+++ b/cmds/core/cat.js
@@ -17,9 +17,12 @@
 
 "use strict";
 
-exports.command = ['cat <patterns..>', 'type <patterns..>'];
-exports.desc = UTIL.hide_cmd('View filename(s)');
-exports.builder = yargs => yargs
+import { TITLE_CMD_OPTION } from "../../src/env.js";
+import { e_call, hide_cmd, def_flag } from '../../src/util.js';
+
+export const command = ['cat <patterns..>', 'type <patterns..>'];
+export const desc = hide_cmd('View filename(s)');
+export const builder = yargs => yargs
   .positional(
     '<patterns..>', {
       description: 'patterns you want to search (wildcard)',
@@ -35,8 +38,8 @@ exports.builder = yargs => yargs
     },
   });
 
-exports.handler = async (argv) => {
-  await UTIL.e_call(argv, 'core/cat'
-                    , argv.patterns
-                    , UTIL.def_flag(argv.number, '--number'));
+export const handler = async (argv) => {
+  await e_call(argv, 'core/cat'
+    , argv.patterns
+    , def_flag(argv.number, '--number'));
 };
diff --git a/cmds/core/clean.js b/cmds/core/clean.js
index 36e9cfd8..2aa4a952 100644
--- a/cmds/core/clean.js
+++ b/cmds/core/clean.js
@@ -17,17 +17,22 @@
 
 "use strict";
 
-exports.command = ['clean <type>'];
-exports.desc = 'Delete various files produced during building';
-exports.builder = function (yargs) {
-  yargs.usage(`${exports.desc}
+import path from 'path';
+import { cmd_count } from '../../src/util.js';
+
+const __dirname = import.meta.dirname;
+
+export const command = ['clean <type>'];
+export const desc = 'Delete various files produced during building';
+export const builder = function (yargs) {
+  yargs.usage(`${desc}
 
 Usage: eask clean <type> [options..]`)
-    .commandDir('../clean/')
+    .commandDir(path.join(__dirname, '../clean/'))
     .demandCommand();
 
   /* XXX: Configure only in the menu. */
-  if (UTIL.cmd_count() == 1) {
+  if (cmd_count() == 1) {
     yargs.positional(
       '<type>', {
         description: 'type of the cleaning task',
@@ -35,4 +40,4 @@ Usage: eask clean <type> [options..]`)
   }
 }
 
-exports.handler = async (argv) => { };
+export const handler = async (argv) => { };
diff --git a/cmds/core/compile.js b/cmds/core/compile.js
index 4ffa3326..d388fcc1 100644
--- a/cmds/core/compile.js
+++ b/cmds/core/compile.js
@@ -17,9 +17,12 @@
 
 "use strict";
 
-exports.command = ['compile [names..]'];
-exports.desc = "Byte-compile `.el' files";
-exports.builder = yargs => yargs
+import { TITLE_CMD_OPTION } from "../../src/env.js";
+import { e_call, def_flag } from '../../src/util.js';
+
+export const command = ['compile [names..]'];
+export const desc = "Byte-compile `.el' files";
+export const builder = yargs => yargs
   .positional(
     '[names..]', {
       description: 'specify files to byte-compile',
@@ -33,8 +36,8 @@ exports.builder = yargs => yargs
     },
   });
 
-exports.handler = async (argv) => {
-  await UTIL.e_call(argv, 'core/compile'
+export const handler = async (argv) => {
+  await e_call(argv, 'core/compile'
                     , argv.names
-                    , UTIL.def_flag(argv.clean, '--clean'));
+                    , def_flag(argv.clean, '--clean'));
 };
diff --git a/cmds/core/concat.js b/cmds/core/concat.js
index f6d164ed..a2318b27 100644
--- a/cmds/core/concat.js
+++ b/cmds/core/concat.js
@@ -17,9 +17,12 @@
 
 "use strict";
 
-exports.command = ['concat [names..]', 'concatenate [names..]'];
-exports.desc = UTIL.hide_cmd('Concatenate elisp files');
-exports.builder = yargs => yargs
+import { TITLE_CMD_OPTION } from "../../src/env.js";
+import { e_call, hide_cmd, def_flag } from '../../src/util.js';
+
+export const command = ['concat [names..]', 'concatenate [names..]'];
+export const desc = hide_cmd('Concatenate elisp files');
+export const builder = yargs => yargs
   .positional(
     '[names..]', {
       description: 'specify files to concatenate',
@@ -41,9 +44,9 @@ exports.builder = yargs => yargs
     },
   });
 
-exports.handler = async (argv) => {
-  await UTIL.e_call(argv, 'core/concat'
-                    , argv.names
-                    , UTIL.def_flag(argv.dest, '--dest', argv.dest)
-                    , UTIL.def_flag(argv.output, '--output', argv.output));
+export const handler = async (argv) => {
+  await e_call(argv, 'core/concat'
+    , argv.names
+    , def_flag(argv.dest, '--dest', argv.dest)
+    , def_flag(argv.output, '--output', argv.output));
 };
diff --git a/cmds/core/create.js b/cmds/core/create.js
index c91b3d4e..4a4526cc 100644
--- a/cmds/core/create.js
+++ b/cmds/core/create.js
@@ -17,17 +17,22 @@
 
 "use strict";
 
-exports.command = ['create <type>'];
-exports.desc = 'Create a new elisp project';
-exports.builder = function (yargs) {
-  yargs.usage(`${exports.desc}
+import path from 'path';
+import { cmd_count } from '../../src/util.js';
+
+const __dirname = import.meta.dirname;
+
+export const command = ['create <type>'];
+export const desc = 'Create a new elisp project';
+export const builder = function (yargs) {
+  yargs.usage(`${desc}
 
 Usage: eask create <type> [options..]`)
-    .commandDir('../create/')
+    .commandDir(path.join(__dirname, '../create/'))
     .demandCommand();
 
   /* XXX: Configure only in the menu. */
-  if (UTIL.cmd_count() == 1) {
+  if (cmd_count() == 1) {
     yargs.positional(
       '<type>', {
         description: 'type of the creation',
@@ -35,4 +40,4 @@ Usage: eask create <type> [options..]`)
   }
 }
 
-exports.handler = async (argv) => { };
+export const handler = async (argv) => { };
diff --git a/cmds/core/docker.js b/cmds/core/docker.js
index 0ab6552e..80c5ce49 100644
--- a/cmds/core/docker.js
+++ b/cmds/core/docker.js
@@ -17,12 +17,13 @@
 
 "use strict";
 
-const path = require('path');
-const child_process = require("child_process");
+import path from 'path';
+import child_process from "child_process";
+import { which, cli_args, slash } from '../../src/util.js';
 
-exports.command = ['docker <version> [args..]'];
-exports.desc = 'Launch specified Emacs version in a Docker container';
-exports.builder = async (yargs) => {
+export const command = ['docker <version> [args..]'];
+export const desc = 'Launch specified Emacs version in a Docker container';
+export const builder = async (yargs) => {
   yargs.help(false);
   yargs.version(false);
   yargs.getOptions().narg = [];
@@ -33,8 +34,8 @@ exports.builder = async (yargs) => {
   });
 };
 
-exports.handler = async (argv) => {
-  if (!UTIL.which('docker')) {
+export const handler = async (argv) => {
+  if (!which('docker')) {
     console.warn("Docker is not installed (cannot find `docker' executable)");
     return;
   }
@@ -67,7 +68,7 @@ exports.handler = async (argv) => {
 
   let cmd = default_cmd.concat(rest);
 
-  let proc = child_process.spawn(UTIL.cli_args(cmd), { stdio: 'inherit', shell: true });
+  let proc = child_process.spawn(cli_args(cmd), { stdio: 'inherit', shell: true });
 
   proc.on('close', function (code) {
     if (code == 0) return;
@@ -80,7 +81,7 @@ exports.handler = async (argv) => {
  * @param { String } path - Path to convert.
  */
 function convert_path(path) {
-  return UTIL.slash(path).replaceAll(':', '');
+  return slash(path).replaceAll(':', '');
 }
 
 /**
diff --git a/cmds/core/docs.js b/cmds/core/docs.js
index 7bb2b9bf..bec1f7c2 100644
--- a/cmds/core/docs.js
+++ b/cmds/core/docs.js
@@ -17,17 +17,22 @@
 
 "use strict";
 
-exports.command = ['docs <generator>', 'doc <generator>'];
-exports.desc = 'Build documentation';
-exports.builder = function (yargs) {
-  yargs.usage(`${exports.desc}
+import path from 'path';
+import { cmd_count } from '../../src/util.js';
+
+const __dirname = import.meta.dirname;
+
+export const command = ['docs <generator>', 'doc <generator>'];
+export const desc = 'Build documentation';
+export const builder = function (yargs) {
+  yargs.usage(`${desc}
 
 Usage: eask docs <generator> [options..]`)
-    .commandDir('../docs/')
+    .commandDir(path.join(__dirname, '../docs/'))
     .demandCommand();
 
   /* XXX: Configure only in the menu. */
-  if (UTIL.cmd_count() == 1) {
+  if (cmd_count() == 1) {
     yargs.positional(
       '<generator>', {
         description: 'type of the generator',
@@ -35,4 +40,4 @@ Usage: eask docs <generator> [options..]`)
   }
 }
 
-exports.handler = async (argv) => { };
+export const handler = async (argv) => { };
diff --git a/cmds/core/emacs.js b/cmds/core/emacs.js
index 53f350be..bd8777ae 100644
--- a/cmds/core/emacs.js
+++ b/cmds/core/emacs.js
@@ -17,26 +17,28 @@
 
 "use strict";
 
-const child_process = require("child_process");
+import child_process from "child_process";
+import { EASK_EMACS } from '../../src/env.js';
+import { el_script, setup_env, cli_args, take_after } from '../../src/util.js';
 
-exports.command = ['emacs [args..]'];
-exports.desc = 'Execute emacs with the appropriate environment';
-exports.builder = async (yargs) => {
+export const command = ['emacs [args..]'];
+export const desc = 'Execute emacs with the appropriate environment';
+export const builder = async (yargs) => {
   yargs.help(false);
   yargs.version(false);
   yargs.getOptions().narg = [];
   yargs.strict(false);
 };
 
-exports.handler = async (argv) => {
-  let s_path = UTIL.el_script('core/emacs');
+export const handler = async (argv) => {
+  let s_path = el_script('core/emacs');
 
   let default_cmd = [EASK_EMACS, '-Q', '-l', s_path];
-  let rest = UTIL.take_after(process.argv, EASK_EMACS);
+  let rest = take_after(process.argv, EASK_EMACS);
   let cmd = default_cmd.concat(rest);
 
-  UTIL.setup_env();
-  let proc = child_process.spawn(UTIL.cli_args(cmd), { stdio: 'inherit', shell: true });
+  setup_env();
+  let proc = child_process.spawn(cli_args(cmd), { stdio: 'inherit', shell: true });
 
   proc.on('close', function (code) {
     if (code == 0) return;
diff --git a/cmds/core/eval.js b/cmds/core/eval.js
index 82e394b8..e10ada6c 100644
--- a/cmds/core/eval.js
+++ b/cmds/core/eval.js
@@ -17,20 +17,22 @@
 
 "use strict";
 
-const fs = require('fs');
-const child_process = require("child_process");
+import fs from 'fs';
+import child_process from "child_process";
+import { EASK_HOMEDIR } from "../../src/env.js";
+import { e_call, cli_args } from '../../src/util.js';
 
-exports.command = ['eval [form]'];
-exports.desc = 'Evaluate lisp form with a proper PATH';
-exports.builder = yargs => yargs
+export const command = ['eval [form]'];
+export const desc = 'Evaluate lisp form with a proper PATH';
+export const builder = yargs => yargs
   .positional(
     '[form]', {
       description: 'lisp form',
       type: 'string',
     });
 
-exports.handler = async (argv) => {
-  await UTIL.e_call(argv, 'core/eval', argv.form);
+export const handler = async (argv) => {
+  await e_call(argv, 'core/eval', argv.form);
 
   if (!fs.existsSync(EASK_HOMEDIR)) {
     return;
@@ -53,7 +55,7 @@ exports.handler = async (argv) => {
 
   let cmd = ['emacs', '--batch', '--eval', argv.form];
 
-  let proc = child_process.spawn(UTIL.cli_args(cmd), { stdio: 'inherit', shell: true });
+  let proc = child_process.spawn(cli_args(cmd), { stdio: 'inherit', shell: true });
 
   proc.on('close', function (code) {
     if (code == 0) return;
diff --git a/cmds/core/exec-path.js b/cmds/core/exec-path.js
index e6e28fec..4967ec8f 100644
--- a/cmds/core/exec-path.js
+++ b/cmds/core/exec-path.js
@@ -17,15 +17,17 @@
 
 "use strict";
 
-exports.command = ['path [patterns..]', 'exec-path [patterns..]'];
-exports.desc = 'Print the PATH (exec-path) from workspace';
-exports.builder = yargs => yargs
+import { e_call } from '../../src/util.js';
+
+export const command = ['path [patterns..]', 'exec-path [patterns..]'];
+export const desc = 'Print the PATH (exec-path) from workspace';
+export const builder = yargs => yargs
   .positional(
     '[patterns..]', {
       description: 'patterns you want to search (regex)',
       type: 'array',
     });
 
-exports.handler = async (argv) => {
-  await UTIL.e_call(argv, 'core/exec-path', argv.patterns);
+export const handler = async (argv) => {
+  await e_call(argv, 'core/exec-path', argv.patterns);
 };
diff --git a/cmds/core/exec.js b/cmds/core/exec.js
index f791d14a..e4bfee7f 100644
--- a/cmds/core/exec.js
+++ b/cmds/core/exec.js
@@ -17,22 +17,24 @@
 
 "use strict";
 
-const fs = require('fs');
-const child_process = require("child_process");
-
-exports.command = ['exec [args..]'];
-exports.desc = 'Execute command with correct environment PATH set up';
-exports.builder = async (yargs) => {
+import fs from 'fs';
+import child_process from "child_process";
+import { EASK_HOMEDIR } from "../../src/env.js";
+import { e_call, cli_args, take_after } from '../../src/util.js';
+
+export const command = ['exec [args..]'];
+export const desc = 'Execute command with correct environment PATH set up';
+export const builder = async (yargs) => {
   yargs.help(false);
   yargs.version(false);
   yargs.getOptions().narg = [];
   yargs.strict(false);
 };
 
-exports.handler = async (argv) => {
-  let cmd = UTIL.take_after(process.argv, 'exec');
+export const handler = async (argv) => {
+  let cmd = take_after(process.argv, 'exec');
 
-  await UTIL.e_call(argv, 'core/exec', '--', cmd);
+  await e_call(argv, 'core/exec', '--', cmd);
 
   if (cmd.length == 0) {
     return;
@@ -52,7 +54,7 @@ exports.handler = async (argv) => {
   process.env.PATH = fs.readFileSync(epf, 'utf8');
   process.env.EMACSLOADPATH = fs.readFileSync(lpf, 'utf8');
 
-  let proc = child_process.spawn(UTIL.cli_args(cmd), { stdio: 'inherit', shell: true });
+  let proc = child_process.spawn(cli_args(cmd), { stdio: 'inherit', shell: true });
 
   proc.on('close', function (code) {
     if (code == 0) return;
diff --git a/cmds/core/files.js b/cmds/core/files.js
index 8a34ea46..1a7219a8 100644
--- a/cmds/core/files.js
+++ b/cmds/core/files.js
@@ -17,15 +17,17 @@
 
 "use strict";
 
-exports.command = ['files [patterns..]'];
-exports.desc = 'Print all package files';
-exports.builder = yargs => yargs
+import { e_call } from "../../src/util.js";
+
+export const command = ['files [patterns..]'];
+export const desc = 'Print all package files';
+export const builder = yargs => yargs
   .positional(
     '[patterns..]', {
       description: 'patterns you want to search (wildcard)',
       type: 'array',
     });
 
-exports.handler = async (argv) => {
-  await UTIL.e_call(argv, 'core/files', argv.patterns);
+export const handler = async (argv) => {
+  await e_call(argv, 'core/files', argv.patterns);
 };
diff --git a/cmds/core/format.js b/cmds/core/format.js
index 99cf8792..61a91a42 100644
--- a/cmds/core/format.js
+++ b/cmds/core/format.js
@@ -17,17 +17,22 @@
 
 "use strict";
 
-exports.command = ['format <type>', 'fmt <type>'];
-exports.desc = 'Run formatters';
-exports.builder = function (yargs) {
-  yargs.usage(`${exports.desc}
+import path from 'path';
+import { cmd_count } from '../../src/util.js';
+
+const __dirname = import.meta.dirname;
+
+export const command = ['format <type>', 'fmt <type>'];
+export const desc = 'Run formatters';
+export const builder = function (yargs) {
+  yargs.usage(`${desc}
 
 Usage: eask format <type> [options..]`)
-    .commandDir('../format/')
+    .commandDir(path.join(__dirname, '../format/'))
     .demandCommand();
 
   /* XXX: Configure only in the menu. */
-  if (UTIL.cmd_count() == 1) {
+  if (cmd_count() == 1) {
     yargs.positional(
       '<type>', {
         description: 'type of the formatter',
@@ -35,4 +40,4 @@ Usage: eask format <type> [options..]`)
   }
 }
 
-exports.handler = async (argv) => { };
+export const handler = async (argv) => { };
diff --git a/cmds/core/generate.js b/cmds/core/generate.js
index e3e0025f..9e1ec3cb 100644
--- a/cmds/core/generate.js
+++ b/cmds/core/generate.js
@@ -17,17 +17,22 @@
 
 "use strict";
 
-exports.command = ['generate <type>'];
-exports.desc = 'Generate files that are used for the development';
-exports.builder = function (yargs) {
-  yargs.usage(`${exports.desc}
+import path from 'path';
+import { cmd_count } from '../../src/util.js';
+
+const __dirname = import.meta.dirname;
+
+export const command = ['generate <type>'];
+export const desc = 'Generate files that are used for the development';
+export const builder = function (yargs) {
+  yargs.usage(`${desc}
 
 Usage: eask generate <type> [options..]`)
-    .commandDir('../generate/')
+    .commandDir(path.join(__dirname, '../generate/'))
     .demandCommand();
 
   /* XXX: Configure only in the menu. */
-  if (UTIL.cmd_count() == 1) {
+  if (cmd_count() == 1) {
     yargs.positional(
       '<type>', {
         description: 'type of the file',
@@ -35,4 +40,4 @@ Usage: eask generate <type> [options..]`)
   }
 }
 
-exports.handler = async (argv) => { };
+export const handler = async (argv) => { };
diff --git a/cmds/core/info.js b/cmds/core/info.js
index d5886d2d..61b8cf55 100644
--- a/cmds/core/info.js
+++ b/cmds/core/info.js
@@ -17,9 +17,11 @@
 
 "use strict";
 
-exports.command = ['info'];
-exports.desc = 'Display information about the current package';
+import { e_call } from "../../src/util.js";
 
-exports.handler = async (argv) => {
-  await UTIL.e_call(argv, 'core/info');
+export const command = ['info'];
+export const desc = 'Display information about the current package';
+
+export const handler = async (argv) => {
+  await e_call(argv, 'core/info');
 };
diff --git a/cmds/core/init.js b/cmds/core/init.js
index 9045c58a..0aa88525 100644
--- a/cmds/core/init.js
+++ b/cmds/core/init.js
@@ -17,9 +17,12 @@
 
 "use strict";
 
-exports.command = ['init [files..]'];
-exports.desc = 'Initialize project to use Eask';
-exports.builder = yargs => yargs
+import { TITLE_CMD_OPTION } from "../../src/env.js";
+import { e_call, def_flag } from "../../src/util.js";
+
+export const command = ['init [files..]'];
+export const desc = 'Initialize project to use Eask';
+export const builder = yargs => yargs
   .positional(
     '[files..]', {
       description: 'files to use with `--from` flag',
@@ -34,15 +37,15 @@ exports.builder = yargs => yargs
     },
   });
 
-exports.handler = async (argv) => {
+export const handler = async (argv) => {
   if (argv.from) {
     switch (argv.from) {
     case 'cask':
     case 'eldev':
     case 'keg':
     case 'source':
-      await UTIL.e_call(argv, 'init/' + argv.from
-                        , UTIL.def_flag(argv.from, '--from', argv.from)
+      await e_call(argv, 'init/' + argv.from
+                        , def_flag(argv.from, '--from', argv.from)
                         , argv.files);
       break;
     default:
@@ -50,6 +53,6 @@ exports.handler = async (argv) => {
       break;
     }
   } else {
-    await UTIL.e_call(argv, 'core/init');
+    await e_call(argv, 'core/init');
   }
 };
diff --git a/cmds/core/install-deps.js b/cmds/core/install-deps.js
index 1172f2a3..271ce652 100644
--- a/cmds/core/install-deps.js
+++ b/cmds/core/install-deps.js
@@ -17,9 +17,12 @@
 
 "use strict";
 
-exports.command = ['install-deps', 'install-dependencies', 'prepare'];
-exports.desc = 'Automatically install package dependencies';
-exports.builder = yargs => yargs
+import { TITLE_CMD_OPTION } from "../../src/env.js";
+import { e_call, def_flag } from "../../src/util.js";
+
+export const command = ['install-deps', 'install-dependencies', 'prepare'];
+export const desc = 'Automatically install package dependencies';
+export const builder = yargs => yargs
   .options({
     'development': {
       description: 'also install development dependencies',
@@ -29,7 +32,7 @@ exports.builder = yargs => yargs
     },
   });
 
-exports.handler = async (argv) => {
-  await UTIL.e_call(argv, 'core/install-deps'
-                    , UTIL.def_flag(argv.development, '--dev'));
+export const handler = async (argv) => {
+  await e_call(argv, 'core/install-deps'
+                    , def_flag(argv.development, '--dev'));
 };
diff --git a/cmds/core/install-file.js b/cmds/core/install-file.js
index 303c8204..e5204bd7 100644
--- a/cmds/core/install-file.js
+++ b/cmds/core/install-file.js
@@ -17,15 +17,17 @@
 
 "use strict";
 
-exports.command = ['install-file [files..]'];
-exports.desc = 'Install packages from files, .tar files, or directories';
-exports.builder = yargs => yargs
+import { e_call } from "../../src/util.js";
+
+export const command = ['install-file [files..]'];
+export const desc = 'Install packages from files, .tar files, or directories';
+export const builder = yargs => yargs
   .positional(
     '[files..]', {
       description: 'files to install as packages',
       type: 'array',
     });
 
-exports.handler = async (argv) => {
-  await UTIL.e_call(argv, 'core/install-file', argv.files);
+export const handler = async (argv) => {
+  await e_call(argv, 'core/install-file', argv.files);
 };
diff --git a/cmds/core/install-vc.js b/cmds/core/install-vc.js
index d7a1df67..f9734c80 100644
--- a/cmds/core/install-vc.js
+++ b/cmds/core/install-vc.js
@@ -17,15 +17,17 @@
 
 "use strict";
 
-exports.command = ['install-vc [specs..]'];
-exports.desc = 'Fetch and install packages directly via version control';
-exports.builder = yargs => yargs
+import { e_call } from "../../src/util.js";
+
+export const command = ['install-vc [specs..]'];
+export const desc = 'Fetch and install packages directly via version control';
+export const builder = yargs => yargs
   .positional(
     '[specs..]', {
       description: 'vc specification to install as packages',
       type: 'array',
     });
 
-exports.handler = async (argv) => {
-  await UTIL.e_call(argv, 'core/install-vc', argv.specs);
+export const handler = async (argv) => {
+  await e_call(argv, 'core/install-vc', argv.specs);
 };
diff --git a/cmds/core/install.js b/cmds/core/install.js
index 27799baf..91b8f664 100644
--- a/cmds/core/install.js
+++ b/cmds/core/install.js
@@ -17,15 +17,17 @@
 
 "use strict";
 
-exports.command = ['install [names..]'];
-exports.desc = 'Install packages from archives or install from the workspace';
-exports.builder = yargs => yargs
+import { e_call } from "../../src/util.js";
+
+export const command = ['install [names..]'];
+export const desc = 'Install packages from archives or install from the workspace';
+export const builder = yargs => yargs
   .positional(
     '[names..]', {
       description: 'packages to install',
       type: 'array',
     });
 
-exports.handler = async (argv) => {
-  await UTIL.e_call(argv, 'core/install', argv.names);
+export const handler = async (argv) => {
+  await e_call(argv, 'core/install', argv.names);
 };
diff --git a/cmds/core/keywords.js b/cmds/core/keywords.js
index 32a1431d..9c55fb71 100644
--- a/cmds/core/keywords.js
+++ b/cmds/core/keywords.js
@@ -17,9 +17,11 @@
 
 "use strict";
 
-exports.command = ['keywords'];
-exports.desc = 'Display the available keywords for use in the header section';
+import { e_call } from "../../src/util.js";
 
-exports.handler = async (argv) => {
-  await UTIL.e_call(argv, 'core/keywords');
+export const command = ['keywords'];
+export const desc = 'Display the available keywords for use in the header section';
+
+export const handler = async (argv) => {
+  await e_call(argv, 'core/keywords');
 };
diff --git a/cmds/core/link.js b/cmds/core/link.js
index 37a429fe..66cbab74 100644
--- a/cmds/core/link.js
+++ b/cmds/core/link.js
@@ -17,17 +17,22 @@
 
 "use strict";
 
-exports.command = ['link <action>'];
-exports.desc = 'Manage links';
-exports.builder = function (yargs) {
-  yargs.usage(`${exports.desc}
+import path from 'path';
+import { cmd_count } from '../../src/util.js';
+
+const __dirname = import.meta.dirname;
+
+export const command = ['link <action>'];
+export const desc = 'Manage links';
+export const builder = function (yargs) {
+  yargs.usage(`${desc}
 
 Usage: eask link <action> [options..]`)
-    .commandDir('../link/')
+    .commandDir(path.join(__dirname, '../link/'))
     .demandCommand();
 
   /* XXX: Configure only in the menu. */
-  if (UTIL.cmd_count() == 1) {
+  if (cmd_count() == 1) {
     yargs.positional(
       '<action>', {
         description: 'type of link action',
@@ -35,4 +40,4 @@ Usage: eask link <action> [options..]`)
   }
 }
 
-exports.handler = async (argv) => { };
+export const handler = async (argv) => { };
diff --git a/cmds/core/lint.js b/cmds/core/lint.js
index 6772d13a..4ee38fd2 100644
--- a/cmds/core/lint.js
+++ b/cmds/core/lint.js
@@ -17,17 +17,22 @@
 
 "use strict";
 
-exports.command = ['lint <type>'];
-exports.desc = 'Run linters';
-exports.builder = function (yargs) {
-  yargs.usage(`${exports.desc}
+import path from 'path';
+import { cmd_count } from '../../src/util.js';
+
+const __dirname = import.meta.dirname;
+
+export const command = ['lint <type>'];
+export const desc = 'Run linters';
+export const builder = function (yargs) {
+  yargs.usage(`${desc}
 
 Usage: eask lint <type> [options..]`)
-    .commandDir('../lint/')
+    .commandDir(path.join(__dirname, '../lint/'))
     .demandCommand();
 
   /* XXX: Configure only in the menu. */
-  if (UTIL.cmd_count() == 1) {
+  if (cmd_count() == 1) {
     yargs.positional(
       '<type>', {
         description: 'type of the linter',
@@ -35,4 +40,4 @@ Usage: eask lint <type> [options..]`)
   }
 }
 
-exports.handler = async (argv) => { };
+export const handler = async (argv) => { };
diff --git a/cmds/core/list.js b/cmds/core/list.js
index b98429b9..cdd93f77 100644
--- a/cmds/core/list.js
+++ b/cmds/core/list.js
@@ -17,9 +17,12 @@
 
 "use strict";
 
-exports.command = ['list'];
-exports.desc = 'List all installed packages in dependency tree form';
-exports.builder = yargs => yargs
+import { TITLE_CMD_OPTION } from "../../src/env.js";
+import { e_call, def_flag } from "../../src/util.js";
+
+export const command = ['list'];
+export const desc = 'List all installed packages in dependency tree form';
+export const builder = yargs => yargs
   .options({
     'depth': {
       description: 'dependency depth level to print',
@@ -29,7 +32,7 @@ exports.builder = yargs => yargs
     },
   });
 
-exports.handler = async (argv) => {
-  await UTIL.e_call(argv, 'core/list'
-                    , UTIL.def_flag(argv.depth, '--depth', argv.depth));
+export const handler = async (argv) => {
+  await e_call(argv, 'core/list'
+    , def_flag(argv.depth, '--depth', argv.depth));
 };
diff --git a/cmds/core/load-path.js b/cmds/core/load-path.js
index fe21eefa..8746d0b5 100644
--- a/cmds/core/load-path.js
+++ b/cmds/core/load-path.js
@@ -17,9 +17,12 @@
 
 "use strict";
 
-exports.command = ['load-path [patterns..]'];
-exports.desc = 'Print the load-path from workspace';
-exports.builder = yargs => yargs
+import { TITLE_CMD_OPTION } from "../../src/env.js";
+import { e_call } from "../../src/util.js";
+
+export const command = ['load-path [patterns..]'];
+export const desc = 'Print the load-path from workspace';
+export const builder = yargs => yargs
   .positional(
     '[patterns..]', {
       description: 'patterns you want to search (regex)',
@@ -28,6 +31,6 @@ exports.builder = yargs => yargs
       group: TITLE_CMD_OPTION,
     });
 
-exports.handler = async (argv) => {
-  await UTIL.e_call(argv, 'core/load-path', argv.patterns);
+export const handler = async (argv) => {
+  await e_call(argv, 'core/load-path', argv.patterns);
 };
diff --git a/cmds/core/load.js b/cmds/core/load.js
index 8d7f2950..1fd8db29 100644
--- a/cmds/core/load.js
+++ b/cmds/core/load.js
@@ -17,15 +17,17 @@
 
 "use strict";
 
-exports.command = ['load [files..]'];
-exports.desc = 'Load elisp files';
-exports.builder = yargs => yargs
+import { e_call } from "../../src/util.js";
+
+export const command = ['load [files..]'];
+export const desc = 'Load elisp files';
+export const builder = yargs => yargs
   .positional(
     '[files..]', {
       description: 'files to load',
       type: 'array',
     });
 
-exports.handler = async (argv) => {
-  await UTIL.e_call(argv, 'core/load', argv.files);
+export const handler = async (argv) => {
+  await e_call(argv, 'core/load', argv.files);
 };
diff --git a/cmds/core/loc.js b/cmds/core/loc.js
index 1badbb2b..02b500b0 100644
--- a/cmds/core/loc.js
+++ b/cmds/core/loc.js
@@ -17,15 +17,17 @@
 
 "use strict";
 
-exports.command = ['loc [files..]'];
-exports.desc = UTIL.hide_cmd('Print LOC information');
-exports.builder = yargs => yargs
+import { e_call, hide_cmd } from "../../src/util.js";
+
+export const command = ['loc [files..]'];
+export const desc = hide_cmd('Print LOC information');
+export const builder = yargs => yargs
   .positional(
     '[files..]', {
       description: 'files to print LOC information',
       type: 'array',
     });
 
-exports.handler = async (argv) => {
-  await UTIL.e_call(argv, 'core/loc', argv.files);
+export const handler = async (argv) => {
+  await e_call(argv, 'core/loc', argv.files);
 };
diff --git a/cmds/core/outdated.js b/cmds/core/outdated.js
index 4d403cba..3aa7809a 100644
--- a/cmds/core/outdated.js
+++ b/cmds/core/outdated.js
@@ -17,9 +17,12 @@
 
 "use strict";
 
-exports.command = ['outdated'];
-exports.desc = 'Show all outdated dependencies';
-exports.builder = yargs => yargs
+import { TITLE_CMD_OPTION } from "../../src/env.js";
+import { e_call } from "../../src/util.js";
+
+export const command = ['outdated'];
+export const desc = 'Show all outdated dependencies';
+export const builder = yargs => yargs
   .options({
     'depth': {
       description: 'dependency depth level to print',
@@ -29,6 +32,6 @@ exports.builder = yargs => yargs
     },
   });
 
-exports.handler = async (argv) => {
-  await UTIL.e_call(argv, 'core/outdated');
+export const handler = async (argv) => {
+  await e_call(argv, 'core/outdated');
 };
diff --git a/cmds/core/package-directory.js b/cmds/core/package-directory.js
index 5f805678..1ca2f62d 100644
--- a/cmds/core/package-directory.js
+++ b/cmds/core/package-directory.js
@@ -17,9 +17,11 @@
 
 "use strict";
 
-exports.command = ['package-directory'];
-exports.desc = 'Print the path to package directory';
+import { e_call } from "../../src/util.js";
 
-exports.handler = async (argv) => {
-  await UTIL.e_call(argv, 'core/package-directory');
+export const command = ['package-directory'];
+export const desc = 'Print the path to package directory';
+
+export const handler = async (argv) => {
+  await e_call(argv, 'core/package-directory');
 };
diff --git a/cmds/core/package.js b/cmds/core/package.js
index b787cb45..a654cef6 100644
--- a/cmds/core/package.js
+++ b/cmds/core/package.js
@@ -17,9 +17,11 @@
 
 "use strict";
 
-exports.command = ['package [destination]', 'pack [destination]'];
-exports.desc = 'Build a package artifact, and put it into the given destination';
-exports.builder = yargs => yargs
+import { e_call } from "../../src/util.js";
+
+export const command = ['package [destination]', 'pack [destination]'];
+export const desc = 'Build a package artifact, and put it into the given destination';
+export const builder = yargs => yargs
   .positional(
     'destination', {
       description: 'destination path/folder',
@@ -27,6 +29,6 @@ exports.builder = yargs => yargs
       type: 'string',
     });
 
-exports.handler = async (argv) => {
-  await UTIL.e_call(argv, 'core/package', argv.dest);
+export const handler = async (argv) => {
+  await e_call(argv, 'core/package', argv.dest);
 };
diff --git a/cmds/core/recipe.js b/cmds/core/recipe.js
index cab4691e..1b1059ad 100644
--- a/cmds/core/recipe.js
+++ b/cmds/core/recipe.js
@@ -17,9 +17,11 @@
 
 "use strict";
 
-exports.command = ['recipe'];
-exports.desc = 'Suggest a recipe format';
+import { e_call } from "../../src/util.js";
 
-exports.handler = async (argv) => {
-  await UTIL.e_call(argv, 'core/recipe');
+export const command = ['recipe'];
+export const desc = 'Suggest a recipe format';
+
+export const handler = async (argv) => {
+  await e_call(argv, 'core/recipe');
 };
diff --git a/cmds/core/recompile.js b/cmds/core/recompile.js
index b820616b..1be56fa8 100644
--- a/cmds/core/recompile.js
+++ b/cmds/core/recompile.js
@@ -17,9 +17,12 @@
 
 "use strict";
 
-exports.command = ['recompile [names..]'];
-exports.desc = "Byte-recompile `.el' files";
-exports.builder = yargs => yargs
+import { TITLE_CMD_OPTION } from "../../src/env.js";
+import { e_call, def_flag } from "../../src/util.js";
+
+export const command = ['recompile [names..]'];
+export const desc = "Byte-recompile `.el' files";
+export const builder = yargs => yargs
   .positional(
     '[names..]', {
       description: 'specify files to byte-compile',
@@ -33,8 +36,8 @@ exports.builder = yargs => yargs
     },
   });
 
-exports.handler = async (argv) => {
-  await UTIL.e_call(argv, 'core/recompile'
-                    , argv.names
-                    , UTIL.def_flag(argv.clean, '--clean'));
+export const handler = async (argv) => {
+  await e_call(argv, 'core/recompile'
+    , argv.names
+    , def_flag(argv.clean, '--clean'));
 };
diff --git a/cmds/core/refresh.js b/cmds/core/refresh.js
index e6867d95..912b6521 100644
--- a/cmds/core/refresh.js
+++ b/cmds/core/refresh.js
@@ -17,9 +17,11 @@
 
 "use strict";
 
-exports.command = ['refresh'];
-exports.desc = 'Download descriptions of all configured package archives';
+import { e_call } from "../../src/util.js";
 
-exports.handler = async (argv) => {
-  await UTIL.e_call(argv, 'core/refresh');
+export const command = ['refresh'];
+export const desc = 'Download descriptions of all configured package archives';
+
+export const handler = async (argv) => {
+  await e_call(argv, 'core/refresh');
 };
diff --git a/cmds/core/reinstall.js b/cmds/core/reinstall.js
index f50ffdb0..8cfcecbc 100644
--- a/cmds/core/reinstall.js
+++ b/cmds/core/reinstall.js
@@ -17,15 +17,17 @@
 
 "use strict";
 
-exports.command = ['reinstall [names..]'];
-exports.desc = 'Reinstall packages from archives';
-exports.builder = yargs => yargs
+import { e_call } from "../../src/util.js";
+
+export const command = ['reinstall [names..]'];
+export const desc = 'Reinstall packages from archives';
+export const builder = yargs => yargs
   .positional(
     '[names..]', {
       description: 'packages to reinstall',
       type: 'array',
     });
 
-exports.handler = async (argv) => {
-  await UTIL.e_call(argv, 'core/reinstall', argv.names);
+export const handler = async (argv) => {
+  await e_call(argv, 'core/reinstall', argv.names);
 };
diff --git a/cmds/core/repl.js b/cmds/core/repl.js
index e76f12d4..305a9660 100644
--- a/cmds/core/repl.js
+++ b/cmds/core/repl.js
@@ -17,9 +17,11 @@
 
 "use strict";
 
-exports.command = ['repl', 'ielm'];
-exports.desc = UTIL.hide_cmd('Start an Elisp REPL');
+import { e_call, hide_cmd } from "../../src/util.js";
 
-exports.handler = async (argv) => {
-  await UTIL.e_call(argv, 'core/repl');
+export const command = ['repl', 'ielm'];
+export const desc = hide_cmd('Start an Elisp REPL');
+
+export const handler = async (argv) => {
+  await e_call(argv, 'core/repl');
 };
diff --git a/cmds/core/run.js b/cmds/core/run.js
index cff20ebf..59003a52 100644
--- a/cmds/core/run.js
+++ b/cmds/core/run.js
@@ -17,17 +17,22 @@
 
 "use strict";
 
-exports.command = ['run <type>'];
-exports.desc = 'Run custom tasks';
-exports.builder = function (yargs) {
-  yargs.usage(`${exports.desc}
+import path from 'path';
+import { cmd_count } from '../../src/util.js';
+
+const __dirname = import.meta.dirname;
+
+export const command = ['run <type>'];
+export const desc = 'Run custom tasks';
+export const builder = function (yargs) {
+  yargs.usage(`${desc}
 
 Usage: eask run <type> [options..]`)
-    .commandDir('../run/')
+    .commandDir(path.join(__dirname, '../run/'))
     .demandCommand();
 
   /* XXX: Configure only in the menu. */
-  if (UTIL.cmd_count() == 1) {
+  if (cmd_count() == 1) {
     yargs.positional(
       '<type>', {
         description: 'type of the execution',
@@ -35,4 +40,4 @@ Usage: eask run <type> [options..]`)
   }
 }
 
-exports.handler = async (argv) => { };
+export const handler = async (argv) => { };
diff --git a/cmds/core/search.js b/cmds/core/search.js
index 85d395d8..6a070c3f 100644
--- a/cmds/core/search.js
+++ b/cmds/core/search.js
@@ -17,9 +17,12 @@
 
 "use strict";
 
-exports.command = ['search [queries..]'];
-exports.desc = 'Search packages from archives';
-exports.builder = yargs => yargs
+import { TITLE_CMD_OPTION } from "../../src/env.js";
+import { e_call, def_flag } from "../../src/util.js";
+
+export const command = ['search [queries..]'];
+export const desc = 'Search packages from archives';
+export const builder = yargs => yargs
   .positional(
     '[queries..]', {
       description: 'queries to search packages',
@@ -34,7 +37,7 @@ exports.builder = yargs => yargs
     },
   });
 
-exports.handler = async (argv) => {
-  await UTIL.e_call(argv, 'core/search', argv.queries
-                    , UTIL.def_flag(argv.depth, '--depth', argv.depth));
+export const handler = async (argv) => {
+  await e_call(argv, 'core/search', argv.queries
+    , def_flag(argv.depth, '--depth', argv.depth));
 };
diff --git a/cmds/core/source.js b/cmds/core/source.js
index ea168e6b..3196f394 100644
--- a/cmds/core/source.js
+++ b/cmds/core/source.js
@@ -17,17 +17,22 @@
 
 "use strict";
 
-exports.command = ['source <type>'];
-exports.desc = UTIL.hide_cmd('Manage sources');
-exports.builder = function (yargs) {
-  yargs.usage(`${exports.desc}
+import path from 'path';
+import { cmd_count, hide_cmd } from "../../src/util.js";
+
+const __dirname = import.meta.dirname;
+
+export const command = ['source <type>'];
+export const desc = hide_cmd('Manage sources');
+export const builder = function (yargs) {
+  yargs.usage(`${desc}
 
 Usage: eask source <type> [options..]`)
-    .commandDir('../source/')
+    .commandDir(path.join(__dirname, '../source/'))
     .demandCommand();
 
   /* XXX: Configure only in the menu. */
-  if (UTIL.cmd_count() == 1) {
+  if (cmd_count() == 1) {
     yargs.positional(
       '<type>', {
         description: 'type of the control',
@@ -35,4 +40,4 @@ Usage: eask source <type> [options..]`)
   }
 }
 
-exports.handler = async (argv) => {};
+export const handler = async (argv) => {};
diff --git a/cmds/core/status.js b/cmds/core/status.js
index 758188af..16e463fe 100644
--- a/cmds/core/status.js
+++ b/cmds/core/status.js
@@ -17,9 +17,11 @@
 
 "use strict";
 
-exports.command = ['status'];
-exports.desc = 'Show the workspace status';
+import { e_call } from "../../src/util.js";
 
-exports.handler = async (argv) => {
-  await UTIL.e_call(argv, 'core/status');
+export const command = ['status'];
+export const desc = 'Show the workspace status';
+
+export const handler = async (argv) => {
+  await e_call(argv, 'core/status');
 };
diff --git a/cmds/core/test.js b/cmds/core/test.js
index 59f63f48..0a88ac3d 100644
--- a/cmds/core/test.js
+++ b/cmds/core/test.js
@@ -17,17 +17,22 @@
 
 "use strict";
 
-exports.command = ['test <type>'];
-exports.desc = "Run regression/unit tests";
-exports.builder = function (yargs) {
-  yargs.usage(`${exports.desc}
+import path from 'path';
+import { cmd_count } from "../../src/util.js";
+
+const __dirname = import.meta.dirname;
+
+export const command = ['test <type>'];
+export const desc = "Run regression/unit tests";
+export const builder = function (yargs) {
+  yargs.usage(`${desc}
 
 Usage: eask test <type> [options..]`)
-    .commandDir('../test/')
+    .commandDir(path.join(__dirname, '../test/'))
     .demandCommand();
 
   /* XXX: Configure only in the menu. */
-  if (UTIL.cmd_count() == 1) {
+  if (cmd_count() == 1) {
     yargs.positional(
       '<type>', {
         description: 'type of the test framework',
@@ -35,4 +40,4 @@ Usage: eask test <type> [options..]`)
   }
 }
 
-exports.handler = async (argv) => { };
+export const handler = async (argv) => { };
diff --git a/cmds/core/uninstall.js b/cmds/core/uninstall.js
index 441aa8c6..07adcb02 100644
--- a/cmds/core/uninstall.js
+++ b/cmds/core/uninstall.js
@@ -17,15 +17,17 @@
 
 "use strict";
 
-exports.command = ['uninstall [names..]', 'delete [names..]'];
-exports.desc = 'Uninstall packages from archives';
-exports.builder = yargs => yargs
+import { e_call } from "../../src/util.js";
+
+export const command = ['uninstall [names..]', 'delete [names..]'];
+export const desc = 'Uninstall packages from archives';
+export const builder = yargs => yargs
   .positional(
     '[names..]', {
       description: 'packages to uninstall',
       type: 'array',
     });
 
-exports.handler = async (argv) => {
-  await UTIL.e_call(argv, 'core/uninstall', argv.names);
+export const handler = async (argv) => {
+  await e_call(argv, 'core/uninstall', argv.names);
 };
diff --git a/cmds/core/upgrade.js b/cmds/core/upgrade.js
index ebf73928..a07876b7 100644
--- a/cmds/core/upgrade.js
+++ b/cmds/core/upgrade.js
@@ -17,15 +17,17 @@
 
 "use strict";
 
-exports.command = ['upgrade [names..]'];
-exports.desc = 'Upgrade packages from archives';
-exports.builder = yargs => yargs
+import { e_call } from "../../src/util.js";
+
+export const command = ['upgrade [names..]'];
+export const desc = 'Upgrade packages from archives';
+export const builder = yargs => yargs
   .positional(
     '[names..]', {
       description: 'packages to upgrade',
       type: 'array',
     });
 
-exports.handler = async (argv) => {
-  await UTIL.e_call(argv, 'core/upgrade', argv.names);
+export const handler = async (argv) => {
+  await e_call(argv, 'core/upgrade', argv.names);
 };
diff --git a/cmds/create/el-project.js b/cmds/create/el-project.js
index d9e6b138..4c031078 100644
--- a/cmds/create/el-project.js
+++ b/cmds/create/el-project.js
@@ -17,9 +17,11 @@
 
 "use strict";
 
-exports.command = ['el-project'];
-exports.desc = 'Create a new project with `el-project`';
+import { e_call } from "../../src/util.js";
 
-exports.handler = async (argv) => {
-  await UTIL.e_call(argv, 'create/el-project');
+export const command = ['el-project'];
+export const desc = 'Create a new project with `el-project`';
+
+export const handler = async (argv) => {
+  await e_call(argv, 'create/el-project');
 };
diff --git a/cmds/create/elpa.js b/cmds/create/elpa.js
index 43ac6371..69f4eeba 100644
--- a/cmds/create/elpa.js
+++ b/cmds/create/elpa.js
@@ -17,11 +17,12 @@
 
 "use strict";
 
-const child_process = require('child_process');
+import child_process from 'child_process';
+import { e_call } from "../../src/util.js";
 
-exports.command = ['elpa <name>'];
-exports.desc = 'Create a new ELPA using github-elpa';
-exports.builder = yargs => yargs
+export const command = ['elpa <name>'];
+export const desc = 'Create a new ELPA using github-elpa';
+export const builder = yargs => yargs
   .positional(
     '<name>', {
       description: 'new ELPA name',
@@ -30,7 +31,7 @@ exports.builder = yargs => yargs
 
 const TEMPLATE_URL = 'https://github.com/emacs-eask/template-elpa';
 
-exports.handler = async (argv) => {
+export const handler = async (argv) => {
   const project_name = argv.name;
 
   let proc = child_process.spawn('git', ['clone', TEMPLATE_URL, project_name],
@@ -61,6 +62,6 @@ exports.handler = async (argv) => {
 /* Operations after _cloned */
 async function _cloned(argv) {
   console.warn('Initialize the Eask-file for your project...');
-  await UTIL.e_call(argv, 'core/init');
-  await UTIL.e_call(argv, 'create/elpa');
+  await e_call(argv, 'core/init');
+  await e_call(argv, 'create/elpa');
 }
diff --git a/cmds/create/package.js b/cmds/create/package.js
index 24a1194b..c1d30c00 100644
--- a/cmds/create/package.js
+++ b/cmds/create/package.js
@@ -17,11 +17,12 @@
 
 "use strict";
 
-const child_process = require('child_process');
+import child_process from 'child_process';
+import { e_call } from "../../src/util.js";
 
-exports.command = ['package <name>', 'pkg <name>'];
-exports.desc = 'Create a new package';
-exports.builder = yargs => yargs
+export const command = ['package <name>', 'pkg <name>'];
+export const desc = 'Create a new package';
+export const builder = yargs => yargs
   .positional(
     '<name>', {
       description: 'new package name',
@@ -30,7 +31,7 @@ exports.builder = yargs => yargs
 
 const TEMPLATE_URL = 'https://github.com/emacs-eask/template-elisp';
 
-exports.handler = async (argv) => {
+export const handler = async (argv) => {
   const project_name = argv.name;
 
   let proc = child_process.spawn('git', ['clone', TEMPLATE_URL, project_name],
@@ -59,6 +60,6 @@ exports.handler = async (argv) => {
 /* Operations after _cloned */
 async function _cloned(argv) {
   console.warn('Initialize the Eask-file for your project...');
-  await UTIL.e_call(argv, 'core/init');
-  await UTIL.e_call(argv, 'create/package');
+  await e_call(argv, 'core/init');
+  await e_call(argv, 'create/package');
 }
diff --git a/cmds/docs/el2org.js b/cmds/docs/el2org.js
index a072cb6f..a22a5a76 100644
--- a/cmds/docs/el2org.js
+++ b/cmds/docs/el2org.js
@@ -17,9 +17,12 @@
 
 "use strict";
 
-exports.command = ['el2org [names..]', ];
-exports.desc = 'Build documentation with el2org';
-exports.builder = yargs => yargs
+import { TITLE_CMD_OPTION } from "../../src/env.js";
+import { e_call, def_flag } from "../../src/util.js";
+
+export const command = ['el2org [names..]', ];
+export const desc = 'Build documentation with el2org';
+export const builder = yargs => yargs
   .positional(
     '[names..]', {
       description: 'specify source files to scan',
@@ -35,8 +38,8 @@ exports.builder = yargs => yargs
     },
   });
 
-exports.handler = async (argv) => {
-  await UTIL.e_call(argv, 'docs/el2org'
-                    , argv.names
-                    , UTIL.def_flag(argv.dest, '--dest', argv.dest));
+export const handler = async (argv) => {
+  await e_call(argv, 'docs/el2org'
+    , argv.names
+    , def_flag(argv.dest, '--dest', argv.dest));
 };
diff --git a/cmds/format/elfmt.js b/cmds/format/elfmt.js
index bd2e2028..3ede2d3d 100644
--- a/cmds/format/elfmt.js
+++ b/cmds/format/elfmt.js
@@ -17,15 +17,17 @@
 
 "use strict";
 
-exports.command = ['elfmt [files..]'];
-exports.desc = 'Reformat Elisp source with elfmt';
-exports.builder = yargs => yargs
+import { e_call } from "../../src/util.js";
+
+export const command = ['elfmt [files..]'];
+export const desc = 'Reformat Elisp source with elfmt';
+export const builder = yargs => yargs
   .positional(
     '[files..]', {
       description: 'specify files to do elfmt',
       type: 'array',
     });
 
-exports.handler = async (argv) => {
-  await UTIL.e_call(argv, 'format/elfmt', argv.files);
+export const handler = async (argv) => {
+  await e_call(argv, 'format/elfmt', argv.files);
 };
diff --git a/cmds/format/elisp-autofmt.js b/cmds/format/elisp-autofmt.js
index 85f30766..025ec406 100644
--- a/cmds/format/elisp-autofmt.js
+++ b/cmds/format/elisp-autofmt.js
@@ -17,15 +17,17 @@
 
 "use strict";
 
-exports.command = ['elisp-autofmt [files..]'];
-exports.desc = 'Reformat Elisp source with elisp-autofmt';
-exports.builder = yargs => yargs
+import { e_call } from "../../src/util.js";
+
+export const command = ['elisp-autofmt [files..]'];
+export const desc = 'Reformat Elisp source with elisp-autofmt';
+export const builder = yargs => yargs
   .positional(
     '[files..]', {
       description: 'specify files to do elisp-autofmt',
       type: 'array',
     });
 
-exports.handler = async (argv) => {
-  await UTIL.e_call(argv, 'format/elisp-autofmt', argv.files);
+export const handler = async (argv) => {
+  await e_call(argv, 'format/elisp-autofmt', argv.files);
 };
diff --git a/cmds/generate/autoloads.js b/cmds/generate/autoloads.js
index 391fd222..2601712e 100644
--- a/cmds/generate/autoloads.js
+++ b/cmds/generate/autoloads.js
@@ -17,9 +17,11 @@
 
 "use strict";
 
-exports.command = ['autoloads'];
-exports.desc = 'Generate the autoloads file';
+import { e_call } from "../../src/util.js";
 
-exports.handler = async (argv) => {
-  await UTIL.e_call(argv, 'generate/autoloads');
+export const command = ['autoloads'];
+export const desc = 'Generate the autoloads file';
+
+export const handler = async (argv) => {
+  await e_call(argv, 'generate/autoloads');
 };
diff --git a/cmds/generate/ignore.js b/cmds/generate/ignore.js
index 80f5fea8..70f50a68 100644
--- a/cmds/generate/ignore.js
+++ b/cmds/generate/ignore.js
@@ -17,9 +17,12 @@
 
 "use strict";
 
-exports.command = ['ignore <name>'];
-exports.desc = 'Generate an ignore file using .gitignore templates';
-exports.builder = yargs => yargs
+import { TITLE_CMD_OPTION } from "../../src/env.js";
+import { e_call, def_flag } from "../../src/util.js";
+
+export const command = ['ignore <name>'];
+export const desc = 'Generate an ignore file using .gitignore templates';
+export const builder = yargs => yargs
   .positional(
     '<name>', {
       description: 'name of the ignore template',
@@ -34,8 +37,8 @@ exports.builder = yargs => yargs
     },
   });
 
-exports.handler = async (argv) => {
-  await UTIL.e_call(argv, 'generate/ignore'
-                    , argv.name
-                    , UTIL.def_flag(argv.output, '--output', argv.output));
+export const handler = async (argv) => {
+  await e_call(argv, 'generate/ignore'
+    , argv.name
+    , def_flag(argv.output, '--output', argv.output));
 };
diff --git a/cmds/generate/license.js b/cmds/generate/license.js
index 7499d6bc..b8eabc5b 100644
--- a/cmds/generate/license.js
+++ b/cmds/generate/license.js
@@ -17,9 +17,12 @@
 
 "use strict";
 
-exports.command = ['license <name>'];
-exports.desc = 'Generate the LICENSE file';
-exports.builder = yargs => yargs
+import { TITLE_CMD_OPTION } from "../../src/env.js";
+import { e_call, def_flag } from "../../src/util.js";
+
+export const command = ['license <name>'];
+export const desc = 'Generate the LICENSE file';
+export const builder = yargs => yargs
   .positional(
     '<name>', {
       description: 'name of the license',
@@ -34,8 +37,8 @@ exports.builder = yargs => yargs
     },
   });
 
-exports.handler = async (argv) => {
-  await UTIL.e_call(argv, 'generate/license'
-                    , argv.name
-                    , UTIL.def_flag(argv.output, '--output', argv.output));
+export const handler = async (argv) => {
+  await e_call(argv, 'generate/license'
+    , argv.name
+    , def_flag(argv.output, '--output', argv.output));
 };
diff --git a/cmds/generate/pkg-file.js b/cmds/generate/pkg-file.js
index ad08de0e..59ede3e6 100644
--- a/cmds/generate/pkg-file.js
+++ b/cmds/generate/pkg-file.js
@@ -17,9 +17,11 @@
 
 "use strict";
 
-exports.command = ['pkg-file', 'pkg', 'pkg-el'];
-exports.desc = 'Generate the pkg file';
+import { e_call } from "../../src/util.js";
 
-exports.handler = async (argv) => {
-  await UTIL.e_call(argv, 'generate/pkg-file');
+export const command = ['pkg-file', 'pkg', 'pkg-el'];
+export const desc = 'Generate the pkg file';
+
+export const handler = async (argv) => {
+  await e_call(argv, 'generate/pkg-file');
 };
diff --git a/cmds/generate/recipe.js b/cmds/generate/recipe.js
index db1a057f..c2d0917e 100644
--- a/cmds/generate/recipe.js
+++ b/cmds/generate/recipe.js
@@ -17,9 +17,12 @@
 
 "use strict";
 
-exports.command = ['recipe [destination]'];
-exports.desc = 'Generate the recipe file';
-exports.builder = yargs => yargs
+import { TITLE_CMD_OPTION } from "../../src/env.js";
+import { e_call, def_flag } from "../../src/util.js";
+
+export const command = ['recipe [destination]'];
+export const desc = 'Generate the recipe file';
+export const builder = yargs => yargs
   .positional(
     'destination', {
       description: 'destination path/folder',
@@ -35,8 +38,8 @@ exports.builder = yargs => yargs
     },
   });
 
-exports.handler = async (argv) => {
-  await UTIL.e_call(argv, 'generate/recipe'
-                    , argv.dest
-                    , UTIL.def_flag(argv.yes, '--yes'));
+export const handler = async (argv) => {
+  await e_call(argv, 'generate/recipe'
+    , argv.dest
+    , def_flag(argv.yes, '--yes'));
 };
diff --git a/cmds/generate/test.js b/cmds/generate/test.js
index c27ceea8..41dd6f67 100644
--- a/cmds/generate/test.js
+++ b/cmds/generate/test.js
@@ -17,17 +17,22 @@
 
 "use strict";
 
-exports.command = ['test <type>'];
-exports.desc = 'Generate test files based on the testing framework';
-exports.builder = function (yargs) {
-  yargs.usage(`${exports.desc}
+import path from 'path';
+import { cmd_count } from "../../src/util.js";
+
+const __dirname = import.meta.dirname;
+
+export const command = ['test <type>'];
+export const desc = 'Generate test files based on the testing framework';
+export const builder = function (yargs) {
+  yargs.usage(`${desc}
 
 Usage: eask generate test <type> [options..]`)
-    .commandDir('./test/')
+    .commandDir(path.join(__dirname, './test/'))
     .demandCommand();
 
   /* XXX: Configure only in the menu. */
-  if (UTIL.cmd_count() == 2) {
+  if (cmd_count() == 2) {
     yargs.positional(
       '<type>', {
         description: 'type of the testing framework',
@@ -35,4 +40,4 @@ Usage: eask generate test <type> [options..]`)
   }
 }
 
-exports.handler = async (argv) => { };
+export const handler = async (argv) => { };
diff --git a/cmds/generate/test/buttercup.js b/cmds/generate/test/buttercup.js
index a5641fc3..8d975e60 100644
--- a/cmds/generate/test/buttercup.js
+++ b/cmds/generate/test/buttercup.js
@@ -17,9 +17,11 @@
 
 "use strict";
 
-exports.command = ['buttercup'];
-exports.desc = 'Create a new Buttercup setup for the project';
+import { e_call } from "../../../src/util.js";
 
-exports.handler = async (argv) => {
-  await UTIL.e_call(argv, 'generate/test/buttercup', argv.file);
+export const command = ['buttercup'];
+export const desc = 'Create a new Buttercup setup for the project';
+
+export const handler = async (argv) => {
+  await e_call(argv, 'generate/test/buttercup', argv.file);
 };
diff --git a/cmds/generate/test/ecukes.js b/cmds/generate/test/ecukes.js
index 74c7406d..96ce5503 100644
--- a/cmds/generate/test/ecukes.js
+++ b/cmds/generate/test/ecukes.js
@@ -17,9 +17,11 @@
 
 "use strict";
 
-exports.command = ['ecukes'];
-exports.desc = 'Create a new Ecukes setup for the project';
+import { e_call } from "../../../src/util.js";
 
-exports.handler = async (argv) => {
-  await UTIL.e_call(argv, 'generate/test/ecukes', argv.file);
+export const command = ['ecukes'];
+export const desc = 'Create a new Ecukes setup for the project';
+
+export const handler = async (argv) => {
+  await e_call(argv, 'generate/test/ecukes', argv.file);
 };
diff --git a/cmds/generate/test/ert-runner.js b/cmds/generate/test/ert-runner.js
index 22eb7b41..3c3ada6d 100644
--- a/cmds/generate/test/ert-runner.js
+++ b/cmds/generate/test/ert-runner.js
@@ -17,15 +17,17 @@
 
 "use strict";
 
-exports.command = ['ert-runner [names..]'];
-exports.desc = 'Create a new test project for the ert-runner';
-exports.builder = yargs => yargs
+import { e_call } from "../../../src/util.js";
+
+export const command = ['ert-runner [names..]'];
+export const desc = 'Create a new test project for the ert-runner';
+export const builder = yargs => yargs
   .positional(
     '[names..]', {
       description: 'specify test names',
       type: 'array',
     });
 
-exports.handler = async (argv) => {
-  await UTIL.e_call(argv, 'generate/test/ert-runner', argv.names);
+export const handler = async (argv) => {
+  await e_call(argv, 'generate/test/ert-runner', argv.names);
 };
diff --git a/cmds/generate/test/ert.js b/cmds/generate/test/ert.js
index c0854e62..3a78aa7a 100644
--- a/cmds/generate/test/ert.js
+++ b/cmds/generate/test/ert.js
@@ -17,15 +17,17 @@
 
 "use strict";
 
-exports.command = ['ert [names..]'];
-exports.desc = 'Create a new test project for the ert tests';
-exports.builder = yargs => yargs
+import { e_call } from "../../../src/util.js";
+
+export const command = ['ert [names..]'];
+export const desc = 'Create a new test project for the ert tests';
+export const builder = yargs => yargs
   .positional(
     '[names..]', {
       description: 'specify test names',
       type: 'array',
     });
 
-exports.handler = async (argv) => {
-  await UTIL.e_call(argv, 'generate/test/ert', argv.names);
+export const handler = async (argv) => {
+  await e_call(argv, 'generate/test/ert', argv.names);
 };
diff --git a/cmds/generate/workflow.js b/cmds/generate/workflow.js
index 3f219741..7cd7306a 100644
--- a/cmds/generate/workflow.js
+++ b/cmds/generate/workflow.js
@@ -17,17 +17,22 @@
 
 "use strict";
 
-exports.command = ['workflow <type>'];
-exports.desc = 'Generate yaml files for CI/CD';
-exports.builder = function (yargs) {
-  yargs.usage(`${exports.desc}
+import path from 'path';
+import { cmd_count } from "../../src/util.js";
+
+const __dirname = import.meta.dirname;
+
+export const command = ['workflow <type>'];
+export const desc = 'Generate yaml files for CI/CD';
+export const builder = function (yargs) {
+  yargs.usage(`${desc}
 
 Usage: eask generate workflow <type> [options..]`)
-    .commandDir('./workflow/')
+    .commandDir(path.join(__dirname, './workflow/'))
     .demandCommand();
 
   /* XXX: Configure only in the menu. */
-  if (UTIL.cmd_count() == 2) {
+  if (cmd_count() == 2) {
     yargs.positional(
       '<type>', {
         description: 'type of the workflow',
@@ -35,4 +40,4 @@ Usage: eask generate workflow <type> [options..]`)
   }
 }
 
-exports.handler = async (argv) => { };
+export const handler = async (argv) => { };
diff --git a/cmds/generate/workflow/circle-ci.js b/cmds/generate/workflow/circle-ci.js
index 737c6e9a..68f9581f 100644
--- a/cmds/generate/workflow/circle-ci.js
+++ b/cmds/generate/workflow/circle-ci.js
@@ -17,16 +17,18 @@
 
 "use strict";
 
-exports.command = ['circle-ci [file]'];
-exports.desc = 'Generate the CircleCI workflow yaml file';
-exports.builder = yargs => yargs
+import { e_call } from "../../../src/util.js";
+
+export const command = ['circle-ci [file]'];
+export const desc = 'Generate the CircleCI workflow yaml file';
+export const builder = yargs => yargs
   .positional(
     '[file]', {
       description: 'name of the test file; the default is `config.yml`',
       type: 'string',
     });
 
-exports.handler = async (argv) => {
-  await UTIL.e_call(argv, 'generate/workflow/circle-ci', argv.file);
+export const handler = async (argv) => {
+  await e_call(argv, 'generate/workflow/circle-ci', argv.file);
 };
 
diff --git a/cmds/generate/workflow/github.js b/cmds/generate/workflow/github.js
index 041331e2..72c339fe 100644
--- a/cmds/generate/workflow/github.js
+++ b/cmds/generate/workflow/github.js
@@ -17,15 +17,17 @@
 
 "use strict";
 
-exports.command = ['github [file]', 'github-actions [file]', 'gha [file]'];
-exports.desc = 'Generate the GitHub Actions workflow yaml file';
-exports.builder = yargs => yargs
+import { e_call } from "../../../src/util.js";
+
+export const command = ['github [file]', 'github-actions [file]', 'gha [file]'];
+export const desc = 'Generate the GitHub Actions workflow yaml file';
+export const builder = yargs => yargs
   .positional(
     '[file]', {
       description: 'name of the test file; the default is `test.yml`',
       type: 'string',
     });
 
-exports.handler = async (argv) => {
-  await UTIL.e_call(argv, 'generate/workflow/github', argv.file);
+export const handler = async (argv) => {
+  await e_call(argv, 'generate/workflow/github', argv.file);
 };
diff --git a/cmds/generate/workflow/gitlab.js b/cmds/generate/workflow/gitlab.js
index c797c4dd..99bff076 100644
--- a/cmds/generate/workflow/gitlab.js
+++ b/cmds/generate/workflow/gitlab.js
@@ -17,16 +17,18 @@
 
 "use strict";
 
-exports.command = ['gitlab [file]', 'gitlab-runner [file]'];
-exports.desc = 'Generate the GitLab Runner workflow yaml file';
-exports.builder = yargs => yargs
+import { e_call } from "../../../src/util.js";
+
+export const command = ['gitlab [file]', 'gitlab-runner [file]'];
+export const desc = 'Generate the GitLab Runner workflow yaml file';
+export const builder = yargs => yargs
   .positional(
     '[file]', {
       description: 'name of the test file; the default is `.gitlab-ci.yml`',
       type: 'string',
     });
 
-exports.handler = async (argv) => {
-  await UTIL.e_call(argv, 'generate/workflow/gitlab', argv.file);
+export const handler = async (argv) => {
+  await e_call(argv, 'generate/workflow/gitlab', argv.file);
 };
 
diff --git a/cmds/generate/workflow/travis-ci.js b/cmds/generate/workflow/travis-ci.js
index 8d8cadf4..e1f189a7 100644
--- a/cmds/generate/workflow/travis-ci.js
+++ b/cmds/generate/workflow/travis-ci.js
@@ -17,16 +17,18 @@
 
 "use strict";
 
-exports.command = ['travis-ci [file]'];
-exports.desc = 'Generate the Travis CI workflow yaml file';
-exports.builder = yargs => yargs
+import { e_call } from "../../../src/util.js";
+
+export const command = ['travis-ci [file]'];
+export const desc = 'Generate the Travis CI workflow yaml file';
+export const builder = yargs => yargs
   .positional(
     '[file]', {
       description: 'name of the test file; the default is `.travis.yml`',
       type: 'string',
     });
 
-exports.handler = async (argv) => {
-  await UTIL.e_call(argv, 'generate/workflow/travis-ci', argv.file);
+export const handler = async (argv) => {
+  await e_call(argv, 'generate/workflow/travis-ci', argv.file);
 };
 
diff --git a/cmds/link/add.js b/cmds/link/add.js
index 95451dc2..8718aa7b 100644
--- a/cmds/link/add.js
+++ b/cmds/link/add.js
@@ -17,9 +17,12 @@
 
 "use strict";
 
-exports.command = ['add <name> <path>'];
-exports.desc = 'Link a local package';
-exports.builder = yargs => yargs
+import { TITLE_CMD_OPTION } from "../../src/env.js";
+import { e_call } from "../../src/util.js";
+
+export const command = ['add <name> <path>'];
+export const desc = 'Link a local package';
+export const builder = yargs => yargs
   .positional(
     '<name>', {
       description: 'name of the link',
@@ -39,6 +42,6 @@ exports.builder = yargs => yargs
     },
   });
 
-exports.handler = async (argv) => {
-  await UTIL.e_call(argv, 'link/add', argv.name, argv.path);
+export const handler = async (argv) => {
+  await e_call(argv, 'link/add', argv.name, argv.path);
 };
diff --git a/cmds/link/delete.js b/cmds/link/delete.js
index e00d63f7..a38110fd 100644
--- a/cmds/link/delete.js
+++ b/cmds/link/delete.js
@@ -17,15 +17,17 @@
 
 "use strict";
 
-exports.command = ['delete [names..]', 'remove [names..]'];
-exports.desc = 'Delete locally linked packages';
-exports.builder = yargs => yargs
+import { e_call } from "../../src/util.js";
+
+export const command = ['delete [names..]', 'remove [names..]'];
+export const desc = 'Delete locally linked packages';
+export const builder = yargs => yargs
   .positional(
     '[names..]', {
       description: 'name of the link, accept array',
       type: 'array',
     });
 
-exports.handler = async (argv) => {
-  await UTIL.e_call(argv, 'link/delete', argv.names);
+export const handler = async (argv) => {
+  await e_call(argv, 'link/delete', argv.names);
 };
diff --git a/cmds/link/list.js b/cmds/link/list.js
index 96a18349..e69a8c1b 100644
--- a/cmds/link/list.js
+++ b/cmds/link/list.js
@@ -17,9 +17,11 @@
 
 "use strict";
 
-exports.command = ['list'];
-exports.desc = 'List all project links';
+import { e_call } from "../../src/util.js";
 
-exports.handler = async (argv) => {
-  await UTIL.e_call(argv, 'link/list');
+export const command = ['list'];
+export const desc = 'List all project links';
+
+export const handler = async (argv) => {
+  await e_call(argv, 'link/list');
 };
diff --git a/cmds/lint/checkdoc.js b/cmds/lint/checkdoc.js
index d6aa4d7f..a661ca41 100644
--- a/cmds/lint/checkdoc.js
+++ b/cmds/lint/checkdoc.js
@@ -17,15 +17,17 @@
 
 "use strict";
 
-exports.command = ['checkdoc [files..]'];
-exports.desc = 'Run checkdoc';
-exports.builder = yargs => yargs
+import { e_call } from "../../src/util.js";
+
+export const command = ['checkdoc [files..]'];
+export const desc = 'Run checkdoc';
+export const builder = yargs => yargs
   .positional(
     '[files..]', {
       description: 'files you want checkdoc to run on',
       type: 'array',
     });
 
-exports.handler = async (argv) => {
-  await UTIL.e_call(argv, 'lint/checkdoc', argv.files);
+export const handler = async (argv) => {
+  await e_call(argv, 'lint/checkdoc', argv.files);
 };
diff --git a/cmds/lint/declare.js b/cmds/lint/declare.js
index 0ff67261..b1ffc041 100644
--- a/cmds/lint/declare.js
+++ b/cmds/lint/declare.js
@@ -17,15 +17,17 @@
 
 "use strict";
 
-exports.command = ['declare [files..]'];
-exports.desc = 'Run check-declare';
-exports.builder = yargs => yargs
+import { e_call } from "../../src/util.js";
+
+export const command = ['declare [files..]'];
+export const desc = 'Run check-declare';
+export const builder = yargs => yargs
   .positional(
     '[files..]', {
       description: 'files you want check-declare to run on',
       type: 'array',
     });
 
-exports.handler = async (argv) => {
-  await UTIL.e_call(argv, 'lint/declare', argv.files);
+export const handler = async (argv) => {
+  await e_call(argv, 'lint/declare', argv.files);
 };
diff --git a/cmds/lint/elint.js b/cmds/lint/elint.js
index 1c317961..43568344 100644
--- a/cmds/lint/elint.js
+++ b/cmds/lint/elint.js
@@ -17,15 +17,17 @@
 
 "use strict";
 
-exports.command = ['elint [files..]'];
-exports.desc = 'Run elint';
-exports.builder = yargs => yargs
+import { e_call } from "../../src/util.js";
+
+export const command = ['elint [files..]'];
+export const desc = 'Run elint';
+export const builder = yargs => yargs
   .positional(
     '[files..]', {
       description: 'files you want elint to run on',
       type: 'array',
     });
 
-exports.handler = async (argv) => {
-  await UTIL.e_call(argv, 'lint/elint', argv.files);
+export const handler = async (argv) => {
+  await e_call(argv, 'lint/elint', argv.files);
 };
diff --git a/cmds/lint/elisp-lint.js b/cmds/lint/elisp-lint.js
index d5340d0d..7c43f94d 100644
--- a/cmds/lint/elisp-lint.js
+++ b/cmds/lint/elisp-lint.js
@@ -17,15 +17,17 @@
 
 "use strict";
 
-exports.command = ['elisp-lint [files..]'];
-exports.desc = 'Run elisp-lint';
-exports.builder = yargs => yargs
+import { e_call } from "../../src/util.js";
+
+export const command = ['elisp-lint [files..]'];
+export const desc = 'Run elisp-lint';
+export const builder = yargs => yargs
   .positional(
     '[files..]', {
       description: 'files you want elisp-lint to run on',
       type: 'array',
     });
 
-exports.handler = async (argv) => {
-  await UTIL.e_call(argv, 'lint/elisp-lint', argv.files);
+export const handler = async (argv) => {
+  await e_call(argv, 'lint/elisp-lint', argv.files);
 };
diff --git a/cmds/lint/elsa.js b/cmds/lint/elsa.js
index b5d98df5..e611f492 100644
--- a/cmds/lint/elsa.js
+++ b/cmds/lint/elsa.js
@@ -17,15 +17,17 @@
 
 "use strict";
 
-exports.command = ['elsa [files..]'];
-exports.desc = 'Run elsa';
-exports.builder = yargs => yargs
+import { e_call } from "../../src/util.js";
+
+export const command = ['elsa [files..]'];
+export const desc = 'Run elsa';
+export const builder = yargs => yargs
   .positional(
     '[files..]', {
       description: 'files you want elsa to run on',
       type: 'array',
     });
 
-exports.handler = async (argv) => {
-  await UTIL.e_call(argv, 'lint/elsa', argv.files);
+export const handler = async (argv) => {
+  await e_call(argv, 'lint/elsa', argv.files);
 };
diff --git a/cmds/lint/indent.js b/cmds/lint/indent.js
index 08b05d53..64f4ff08 100644
--- a/cmds/lint/indent.js
+++ b/cmds/lint/indent.js
@@ -17,15 +17,17 @@
 
 "use strict";
 
-exports.command = ['indent [files..]'];
-exports.desc = 'Run indent-lint';
-exports.builder = yargs => yargs
+import { e_call } from "../../src/util.js";
+
+export const command = ['indent [files..]'];
+export const desc = 'Run indent-lint';
+export const builder = yargs => yargs
   .positional(
     '[files..]', {
       description: 'files you want indent-lint to run on',
       type: 'array',
     });
 
-exports.handler = async (argv) => {
-  await UTIL.e_call(argv, 'lint/indent', argv.files);
+export const handler = async (argv) => {
+  await e_call(argv, 'lint/indent', argv.files);
 };
diff --git a/cmds/lint/keywords.js b/cmds/lint/keywords.js
index 55e0c8c4..5e8a1769 100644
--- a/cmds/lint/keywords.js
+++ b/cmds/lint/keywords.js
@@ -17,9 +17,11 @@
 
 "use strict";
 
-exports.command = ['keywords'];
-exports.desc = `Run keywords checker (built-in)`;
+import { e_call } from "../../src/util.js";
 
-exports.handler = async (argv) => {
-  await UTIL.e_call(argv, 'lint/keywords');
+export const command = ['keywords'];
+export const desc = `Run keywords checker (built-in)`;
+
+export const handler = async (argv) => {
+  await e_call(argv, 'lint/keywords');
 };
diff --git a/cmds/lint/license.js b/cmds/lint/license.js
index 200a32bd..68b567fc 100644
--- a/cmds/lint/license.js
+++ b/cmds/lint/license.js
@@ -17,9 +17,11 @@
 
 "use strict";
 
-exports.command = ['license'];
-exports.desc = `Run license check`;
+import { e_call } from "../../src/util.js";
 
-exports.handler = async (argv) => {
-  await UTIL.e_call(argv, 'lint/license');
+export const command = ['license'];
+export const desc = `Run license check`;
+
+export const handler = async (argv) => {
+  await e_call(argv, 'lint/license');
 };
diff --git a/cmds/lint/org.js b/cmds/lint/org.js
index 81da3d0c..c39d28bd 100644
--- a/cmds/lint/org.js
+++ b/cmds/lint/org.js
@@ -17,15 +17,17 @@
 
 "use strict";
 
-exports.command = ['org [files..]'];
-exports.desc = `Run org-lint on Org files`;
-exports.builder = yargs => yargs
+import { e_call } from "../../src/util.js";
+
+export const command = ['org [files..]'];
+export const desc = `Run org-lint on Org files`;
+export const builder = yargs => yargs
   .positional(
     '[files..]', {
       description: 'files you want org-lint to run on',
       type: 'array',
     });
 
-exports.handler = async (argv) => {
-  await UTIL.e_call(argv, 'lint/org', argv.files);
+export const handler = async (argv) => {
+  await e_call(argv, 'lint/org', argv.files);
 };
diff --git a/cmds/lint/package.js b/cmds/lint/package.js
index d0a67fe8..9bb5fc75 100644
--- a/cmds/lint/package.js
+++ b/cmds/lint/package.js
@@ -17,15 +17,17 @@
 
 "use strict";
 
-exports.command = ['package [files..]'];
-exports.desc = 'Run package-lint';
-exports.builder = yargs => yargs
+import { e_call } from "../../src/util.js";
+
+export const command = ['package [files..]'];
+export const desc = 'Run package-lint';
+export const builder = yargs => yargs
   .positional(
     '[files..]', {
       description: 'specify files to do package lint',
       type: 'array',
     });
 
-exports.handler = async (argv) => {
-  await UTIL.e_call(argv, 'lint/package', argv.files);
+export const handler = async (argv) => {
+  await e_call(argv, 'lint/package', argv.files);
 };
diff --git a/cmds/lint/regexps.js b/cmds/lint/regexps.js
index e22f01d5..c20ac74d 100644
--- a/cmds/lint/regexps.js
+++ b/cmds/lint/regexps.js
@@ -17,15 +17,17 @@
 
 "use strict";
 
-exports.command = ['regexps [files..]', 'relint [files..]'];
-exports.desc = 'Run relint';
-exports.builder = yargs => yargs
+import { e_call } from "../../src/util.js";
+
+export const command = ['regexps [files..]', 'relint [files..]'];
+export const desc = 'Run relint';
+export const builder = yargs => yargs
   .positional(
     '[files..]', {
       description: 'files you want relint to run on',
       type: 'array',
     });
 
-exports.handler = async (argv) => {
-  await UTIL.e_call(argv, 'lint/regexps', argv.files);
+export const handler = async (argv) => {
+  await e_call(argv, 'lint/regexps', argv.files);
 };
diff --git a/cmds/run/command.js b/cmds/run/command.js
index 3c40b003..aed8500c 100644
--- a/cmds/run/command.js
+++ b/cmds/run/command.js
@@ -17,16 +17,18 @@
 
 "use strict";
 
-exports.command = ['command [names..]', 'cmd [names..]'];
-exports.desc = 'Run elisp commands named [names..]';
-exports.builder = yargs => yargs
+import { e_call } from "../../src/util.js";
+
+export const command = ['command [names..]', 'cmd [names..]'];
+export const desc = 'Run elisp commands named [names..]';
+export const builder = yargs => yargs
   .positional(
     '[names..]', {
       description: 'list of function commands to execute',
       type: 'array',
     });
 
-exports.handler = async (argv) => {
-  await UTIL.e_call(argv, 'run/command'
-                    , argv.names);
+export const handler = async (argv) => {
+  await e_call(argv, 'run/command'
+    , argv.names);
 };
diff --git a/cmds/run/script.js b/cmds/run/script.js
index b378e87c..8aab052e 100644
--- a/cmds/run/script.js
+++ b/cmds/run/script.js
@@ -17,20 +17,22 @@
 
 "use strict";
 
-const fs = require('fs');
-const child_process = require("child_process");
-
-exports.command = ['script [names..]'];
-exports.desc = 'Run script named [names..]';
-exports.builder = yargs => yargs
+import fs from "fs";
+import child_process from "child_process";
+import { IS_PKG, EASK_HOMEDIR } from "../../src/env.js";
+import { e_call } from "../../src/util.js";
+
+export const command = ['script [names..]'];
+export const desc = 'Run script named [names..]';
+export const builder = yargs => yargs
   .positional(
     '[names..]', {
       description: 'specify scripts to run',
       type: 'array',
     });
 
-exports.handler = async (argv) => {
-  await UTIL.e_call(argv, 'run/script', argv.names);
+export const handler = async (argv) => {
+  await e_call(argv, 'run/script', argv.names);
 
   if (!fs.existsSync(EASK_HOMEDIR)) {
     return;
diff --git a/cmds/source/add.js b/cmds/source/add.js
index 08104e9b..4064e9a5 100644
--- a/cmds/source/add.js
+++ b/cmds/source/add.js
@@ -17,9 +17,11 @@
 
 "use strict";
 
-exports.command = ['add <name> [url]'];
-exports.desc = 'Add an archive source';
-exports.builder = yargs => yargs
+import { e_call } from "../../src/util.js";
+
+export const command = ['add <name> [url]'];
+export const desc = 'Add an archive source';
+export const builder = yargs => yargs
   .positional(
     '<name>', {
       description: 'name of the archive',
@@ -31,6 +33,6 @@ exports.builder = yargs => yargs
       type: 'string',
     });
 
-exports.handler = async (argv) => {
-  await UTIL.e_call(argv, 'source/add', argv.name, argv.url);
+export const handler = async (argv) => {
+  await e_call(argv, 'source/add', argv.name, argv.url);
 };
diff --git a/cmds/source/delete.js b/cmds/source/delete.js
index 4a0817b3..f20f7bac 100644
--- a/cmds/source/delete.js
+++ b/cmds/source/delete.js
@@ -17,16 +17,18 @@
 
 "use strict";
 
-exports.command = ['delete <name>', 'remove <name>'];
-exports.desc = 'Remove an archive source';
-exports.builder = yargs => yargs
+import { e_call } from "../../src/util.js";
+
+export const command = ['delete <name>', 'remove <name>'];
+export const desc = 'Remove an archive source';
+export const builder = yargs => yargs
   .positional(
     '<name>', {
       description: 'name of the archive',
       type: 'array',
     });
 
-exports.handler = async (argv) => {
-  await UTIL.e_call(argv, 'source/delete', argv.name);
+export const handler = async (argv) => {
+  await e_call(argv, 'source/delete', argv.name);
 };
 
diff --git a/cmds/source/list.js b/cmds/source/list.js
index bf4ac20b..7365b2de 100644
--- a/cmds/source/list.js
+++ b/cmds/source/list.js
@@ -17,10 +17,12 @@
 
 "use strict";
 
-exports.command = ['list'];
-exports.desc = 'List all source information';
+import { e_call } from "../../src/util.js";
 
-exports.handler = async (argv) => {
-  await UTIL.e_call(argv, 'source/list');
+export const command = ['list'];
+export const desc = 'List all source information';
+
+export const handler = async (argv) => {
+  await e_call(argv, 'source/list');
 };
 
diff --git a/cmds/test/activate.js b/cmds/test/activate.js
index ac28c871..53c965ad 100644
--- a/cmds/test/activate.js
+++ b/cmds/test/activate.js
@@ -17,15 +17,17 @@
 
 "use strict";
 
-exports.command = ['activate [files..]'];
-exports.desc = 'Activate package; use to test package activation';
-exports.builder = yargs => yargs
+import { e_call } from "../../src/util.js";
+
+export const command = ['activate [files..]'];
+export const desc = 'Activate package; use to test package activation';
+export const builder = yargs => yargs
   .positional(
     '[files..]', {
       description: 'files to load after package activation',
       type: 'array',
     });
 
-exports.handler = async (argv) => {
-  await UTIL.e_call(argv, 'test/activate', argv.files);
+export const handler = async (argv) => {
+  await e_call(argv, 'test/activate', argv.files);
 };
diff --git a/cmds/test/buttercup.js b/cmds/test/buttercup.js
index 7386c5f4..87f5465d 100644
--- a/cmds/test/buttercup.js
+++ b/cmds/test/buttercup.js
@@ -17,15 +17,17 @@
 
 "use strict";
 
-exports.command = ['buttercup [directories..]'];
-exports.desc = 'Run buttercup tests';
-exports.builder = yargs => yargs
+import { e_call } from "../../src/util.js";
+
+export const command = ['buttercup [directories..]'];
+export const desc = 'Run buttercup tests';
+export const builder = yargs => yargs
   .positional(
     '[directories..]', {
       description: 'directories containing buttercup tests, must be children of the current directory',
       type: 'array',
     });
 
-exports.handler = async (argv) => {
-  await UTIL.e_call(argv, 'test/buttercup', argv.directories);
+export const handler = async (argv) => {
+  await e_call(argv, 'test/buttercup', argv.directories);
 };
diff --git a/cmds/test/ecukes.js b/cmds/test/ecukes.js
index f3b1a1bc..cad00cac 100644
--- a/cmds/test/ecukes.js
+++ b/cmds/test/ecukes.js
@@ -17,15 +17,17 @@
 
 "use strict";
 
-exports.command = ['ecukes [files..]'];
-exports.desc = 'Run ecukes tests';
-exports.builder = yargs => yargs
+import { e_call } from "../../src/util.js";
+
+export const command = ['ecukes [files..]'];
+export const desc = 'Run ecukes tests';
+export const builder = yargs => yargs
   .positional(
     '[files..]', {
       description: 'specify feature files to do ecukes tests',
       type: 'array',
     });
 
-exports.handler = async (argv) => {
-  await UTIL.e_call(argv, 'test/ecukes', argv.files);
+export const handler = async (argv) => {
+  await e_call(argv, 'test/ecukes', argv.files);
 };
diff --git a/cmds/test/ert-runner.js b/cmds/test/ert-runner.js
index 633f86b5..ff9996fe 100644
--- a/cmds/test/ert-runner.js
+++ b/cmds/test/ert-runner.js
@@ -17,15 +17,17 @@
 
 "use strict";
 
-exports.command = ['ert-runner [files..]'];
-exports.desc = 'Run ert tests using ert-runner';
-exports.builder = yargs => yargs
+import { e_call } from "../../src/util.js";
+
+export const command = ['ert-runner [files..]'];
+export const desc = 'Run ert tests using ert-runner';
+export const builder = yargs => yargs
   .positional(
     '[files..]', {
       description: 'specify files to do ert tests',
       type: 'array',
     });
 
-exports.handler = async (argv) => {
-  await UTIL.e_call(argv, 'test/ert-runner', argv.files);
+export const handler = async (argv) => {
+  await e_call(argv, 'test/ert-runner', argv.files);
 };
diff --git a/cmds/test/ert.js b/cmds/test/ert.js
index ee7f7809..19c70f0e 100644
--- a/cmds/test/ert.js
+++ b/cmds/test/ert.js
@@ -17,15 +17,17 @@
 
 "use strict";
 
-exports.command = ['ert [files..]'];
-exports.desc = 'Run ert tests';
-exports.builder = yargs => yargs
+import { e_call } from "../../src/util.js";
+
+export const command = ['ert [files..]'];
+export const desc = 'Run ert tests';
+export const builder = yargs => yargs
   .positional(
     '[files..]', {
       description: 'specify files to do ert tests',
       type: 'array',
     });
 
-exports.handler = async (argv) => {
-  await UTIL.e_call(argv, 'test/ert', argv.files);
+export const handler = async (argv) => {
+  await e_call(argv, 'test/ert', argv.files);
 };
diff --git a/cmds/test/melpazoid.js b/cmds/test/melpazoid.js
index d517d2d8..22e837c8 100644
--- a/cmds/test/melpazoid.js
+++ b/cmds/test/melpazoid.js
@@ -17,15 +17,17 @@
 
 "use strict";
 
-exports.command = ['melpazoid [directories..]'];
-exports.desc = 'Run melpazoid tests';
-exports.builder = yargs => yargs
+import { e_call } from "../../src/util.js";
+
+export const command = ['melpazoid [directories..]'];
+export const desc = 'Run melpazoid tests';
+export const builder = yargs => yargs
   .positional(
     '[directories..]', {
       description: 'specify directories to do melpazoid tests',
       type: 'array',
     });
 
-exports.handler = async (argv) => {
-  await UTIL.e_call(argv, 'test/melpazoid', argv.directories);
+export const handler = async (argv) => {
+  await e_call(argv, 'test/melpazoid', argv.directories);
 };
diff --git a/cmds/util/locate.js b/cmds/util/locate.js
index 4aae2738..d78cc7c5 100644
--- a/cmds/util/locate.js
+++ b/cmds/util/locate.js
@@ -17,9 +17,11 @@
 
 "use strict";
 
-exports.command = ['locate'];
-exports.desc = 'Show the location where Eask is installed';
+import { plugin_dir } from "../../src/util.js";
 
-exports.handler = async (argv) => {
-  console.log(UTIL.plugin_dir());
+export const command = ['locate'];
+export const desc = 'Show the location where Eask is installed';
+
+export const handler = async (argv) => {
+  console.log(plugin_dir());
 };
diff --git a/cmds/util/root.js b/cmds/util/root.js
index 088f62ad..b1b0c3ee 100644
--- a/cmds/util/root.js
+++ b/cmds/util/root.js
@@ -17,9 +17,11 @@
 
 "use strict";
 
-exports.command = ['root'];
-exports.desc = UTIL.hide_cmd('Display the effective installation directory of your Emacs packages');
+import { hide_cmd, e_call } from "../../src/util.js";
 
-exports.handler = async (argv) => {
-  await UTIL.e_call(argv, 'util/root');
+export const command = ['root'];
+export const desc = hide_cmd('Display the effective installation directory of your Emacs packages');
+
+export const handler = async (argv) => {
+  await e_call(argv, 'util/root');
 };
diff --git a/cmds/util/upgrade-eask.js b/cmds/util/upgrade-eask.js
index f907a64e..fe83b765 100644
--- a/cmds/util/upgrade-eask.js
+++ b/cmds/util/upgrade-eask.js
@@ -17,13 +17,14 @@
 
 "use strict";
 
-const child_process = require("child_process");
+import child_process from "child_process";
+import { plugin_dir } from "../../src/util.js";
 
-exports.command = ['upgrade-eask', 'upgrade-self'];
-exports.desc = 'Upgrade Eask itself';
+export const command = ['upgrade-eask', 'upgrade-self'];
+export const desc = 'Upgrade Eask itself';
 
-exports.handler = async (argv) => {
-  process.chdir(UTIL.plugin_dir());
+export const handler = async (argv) => {
+  process.chdir(plugin_dir());
   let proc = child_process.spawn('git', ['pull'], { stdio: 'inherit' });
 
   // You would just need to register the error event, or else it can't print
diff --git a/docs/content/Contributing/Codebase-Overview/_index.en.md b/docs/content/Contributing/Codebase-Overview/_index.en.md
index 7ad8ecd9..69df3ae1 100644
--- a/docs/content/Contributing/Codebase-Overview/_index.en.md
+++ b/docs/content/Contributing/Codebase-Overview/_index.en.md
@@ -28,21 +28,20 @@ to feed the Emacs session.
 Let's look at the file `cmds/core/archives.js`:
 
 ```js
-exports.command = ['archives', 'sources'];  // alias to sources
-exports.desc = 'List out all package archives';
+export const command = ['archives', 'sources'];  // alias to sources
+export const desc = 'List out all package archives';
 
-exports.handler = async (argv) => {
-  await UTIL.e_call(argv, 'core/archives');
+export const handler = async (argv) => {
+  await e_call(argv, 'core/archives');
 };
 ```
 
 This is a standard yargs command file, which contains all the information we
 need to pass it to the Emacs session.
 
-- **exports.command** is the argument pattern, but it also accepts alias (array)
-- **exports.desc** is the command description
-- **exports.handler** is an asynchronous function that handles command execution
-- **UTIL** is a global variable that points to the `src/util.js` module.
+- **export const command** is the argument pattern, but it also accepts alias (array)
+- **export const desc** is the command description
+- **export const handler** is an asynchronous function that handles command execution
 - **`'core/archives'`** is the elisp file under **lisp** folder (without `.el` extension).
 
 `eask` is a JavaScript file that holds all our global options.
@@ -65,7 +64,7 @@ yargs
 ...
 ```
 
-For **local** options, please use `exports.builder` and specify under its
+For **local** options, please use `export const builder` and specify under its
 command file.
 
 See
diff --git a/docs/content/Contributing/Codebase-Overview/_index.zh-tw.md b/docs/content/Contributing/Codebase-Overview/_index.zh-tw.md
index 8cf699ff..9f75f3c5 100644
--- a/docs/content/Contributing/Codebase-Overview/_index.zh-tw.md
+++ b/docs/content/Contributing/Codebase-Overview/_index.zh-tw.md
@@ -21,20 +21,19 @@ yargs 命令文件是用 JavaScript 編寫的，位於 **cmds** 文件夾下。
 讓我們看一下文件 `cmds/core/archives.js` ：
 
 ```js
-exports.command = ['archives', 'sources'];  // 來源的別名
-exports.desc = 'List out all package archives';
+export const command = ['archives', 'sources'];  // 來源的別名
+export const desc = 'List out all package archives';
 
-exports.handler = async (argv) => {
-  await UTIL.e_call(argv, 'core/archives');
+export const handler = async (argv) => {
+  await e_call(argv, 'core/archives');
 };
 ```
 
 這是一個標準的 yargs 命令文件，裡麵包含了我們所有的信息需要將它傳遞給 Emacs session。
 
-- **exports.command** 是參數模式，但它也接受別名（數組）
-- **exports.desc** 是命令說明
-- **exports.handler** 是處理命令執行的異步函數
-- **UTIL** 是指向 `src/util.js` 模塊的全局變量。
+- **export const command** 是參數模式，但它也接受別名（數組）
+- **export const desc** 是命令說明
+- **export const handler** 是處理命令執行的異步函數
 - **`'core/archives'`** 是 **lisp** 文件夾下的 elisp 文件（沒有 .el 擴展名）。
 
 `eask` 是一個包含我們所有全局選項的 JavaScript 文件。
@@ -57,7 +56,7 @@ yargs
 ...
 ```
 
-對於 **local** 選項，請使用 `exports.builder` 並在其下指定命令文件。
+對於 **local** 選項，請使用 `export const builder` 並在其下指定命令文件。
 
 看
 [yargs/docs/advanced.md](https://github.com/yargs/yargs/blob/main/docs/advanced.md),
diff --git a/eask.js b/eask.js
index 1bfc0731..13acce1b 100644
--- a/eask.js
+++ b/eask.js
@@ -1,7 +1,13 @@
 #!/usr/bin/env node
 
-const env = require('./src/env');
-const yargs = require('yargs');
+import path from 'path';
+import yargs from 'yargs/yargs';
+import { hideBin } from 'yargs/helpers';
+import { TITLE_PROXY_OPTION } from './src/env.js';
+
+const __dirname = import.meta.dirname;
+
+const handler = yargs(hideBin(process.argv));
 
 const usage = `eask is the main command, used to manage your Emacs dependencies
 
@@ -13,15 +19,15 @@ const epilogue = `For more information, find the manual at https://emacs-eask.gi
 
 const version = `0.12.10`;
 
-yargs
+handler
   .usage(usage)
   .scriptName('')
   .epilogue(epilogue)
-  .commandDir('cmds/core/')
-  .commandDir('cmds/util/')
+  .commandDir(path.join(__dirname, './cmds/core/'))
+  .commandDir(path.join(__dirname, './cmds/util/'))
   .command({
     command: '*',
-    handler() { yargs.showHelp(); }
+    handler() { handler.showHelp(); }
   })
   .version('version', 'output version information and exit', version)
   .help('help', 'show usage instructions')
@@ -127,5 +133,5 @@ yargs
   .strict()
   .demandCommand()
   .showHelpOnFail(true)
-  .wrap(yargs.terminalWidth())
+  .wrap(handler.terminalWidth())
   .argv;
diff --git a/package-lock.json b/package-lock.json
index 51a4a7bd..e4967f51 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -10,13 +10,13 @@
       "license": "GPL-3.0-or-later",
       "dependencies": {
         "which": "^6.0.0",
-        "yargs": "^17.0.0"
+        "yargs": "^18.0.0"
       },
       "bin": {
         "eask": "eask.js"
       },
       "devDependencies": {
-        "@yao-pkg/pkg": "^6.0.0",
+        "@yao-pkg/pkg": "^6.16.0",
         "cross-env": "^10.1.0",
         "jest": "^30.3.0",
         "semver-compare": "^1.0.0"
@@ -579,6 +579,448 @@
       "dev": true,
       "license": "MIT"
     },
+    "node_modules/@esbuild/aix-ppc64": {
+      "version": "0.27.7",
+      "resolved": "https://registry.npmjs.org/@esbuild/aix-ppc64/-/aix-ppc64-0.27.7.tgz",
+      "integrity": "sha512-EKX3Qwmhz1eMdEJokhALr0YiD0lhQNwDqkPYyPhiSwKrh7/4KRjQc04sZ8db+5DVVnZ1LmbNDI1uAMPEUBnQPg==",
+      "cpu": [
+        "ppc64"
+      ],
+      "dev": true,
+      "license": "MIT",
+      "optional": true,
+      "os": [
+        "aix"
+      ],
+      "engines": {
+        "node": ">=18"
+      }
+    },
+    "node_modules/@esbuild/android-arm": {
+      "version": "0.27.7",
+      "resolved": "https://registry.npmjs.org/@esbuild/android-arm/-/android-arm-0.27.7.tgz",
+      "integrity": "sha512-jbPXvB4Yj2yBV7HUfE2KHe4GJX51QplCN1pGbYjvsyCZbQmies29EoJbkEc+vYuU5o45AfQn37vZlyXy4YJ8RQ==",
+      "cpu": [
+        "arm"
+      ],
+      "dev": true,
+      "license": "MIT",
+      "optional": true,
+      "os": [
+        "android"
+      ],
+      "engines": {
+        "node": ">=18"
+      }
+    },
+    "node_modules/@esbuild/android-arm64": {
+      "version": "0.27.7",
+      "resolved": "https://registry.npmjs.org/@esbuild/android-arm64/-/android-arm64-0.27.7.tgz",
+      "integrity": "sha512-62dPZHpIXzvChfvfLJow3q5dDtiNMkwiRzPylSCfriLvZeq0a1bWChrGx/BbUbPwOrsWKMn8idSllklzBy+dgQ==",
+      "cpu": [
+        "arm64"
+      ],
+      "dev": true,
+      "license": "MIT",
+      "optional": true,
+      "os": [
+        "android"
+      ],
+      "engines": {
+        "node": ">=18"
+      }
+    },
+    "node_modules/@esbuild/android-x64": {
+      "version": "0.27.7",
+      "resolved": "https://registry.npmjs.org/@esbuild/android-x64/-/android-x64-0.27.7.tgz",
+      "integrity": "sha512-x5VpMODneVDb70PYV2VQOmIUUiBtY3D3mPBG8NxVk5CogneYhkR7MmM3yR/uMdITLrC1ml/NV1rj4bMJuy9MCg==",
+      "cpu": [
+        "x64"
+      ],
+      "dev": true,
+      "license": "MIT",
+      "optional": true,
+      "os": [
+        "android"
+      ],
+      "engines": {
+        "node": ">=18"
+      }
+    },
+    "node_modules/@esbuild/darwin-arm64": {
+      "version": "0.27.7",
+      "resolved": "https://registry.npmjs.org/@esbuild/darwin-arm64/-/darwin-arm64-0.27.7.tgz",
+      "integrity": "sha512-5lckdqeuBPlKUwvoCXIgI2D9/ABmPq3Rdp7IfL70393YgaASt7tbju3Ac+ePVi3KDH6N2RqePfHnXkaDtY9fkw==",
+      "cpu": [
+        "arm64"
+      ],
+      "dev": true,
+      "license": "MIT",
+      "optional": true,
+      "os": [
+        "darwin"
+      ],
+      "engines": {
+        "node": ">=18"
+      }
+    },
+    "node_modules/@esbuild/darwin-x64": {
+      "version": "0.27.7",
+      "resolved": "https://registry.npmjs.org/@esbuild/darwin-x64/-/darwin-x64-0.27.7.tgz",
+      "integrity": "sha512-rYnXrKcXuT7Z+WL5K980jVFdvVKhCHhUwid+dDYQpH+qu+TefcomiMAJpIiC2EM3Rjtq0sO3StMV/+3w3MyyqQ==",
+      "cpu": [
+        "x64"
+      ],
+      "dev": true,
+      "license": "MIT",
+      "optional": true,
+      "os": [
+        "darwin"
+      ],
+      "engines": {
+        "node": ">=18"
+      }
+    },
+    "node_modules/@esbuild/freebsd-arm64": {
+      "version": "0.27.7",
+      "resolved": "https://registry.npmjs.org/@esbuild/freebsd-arm64/-/freebsd-arm64-0.27.7.tgz",
+      "integrity": "sha512-B48PqeCsEgOtzME2GbNM2roU29AMTuOIN91dsMO30t+Ydis3z/3Ngoj5hhnsOSSwNzS+6JppqWsuhTp6E82l2w==",
+      "cpu": [
+        "arm64"
+      ],
+      "dev": true,
+      "license": "MIT",
+      "optional": true,
+      "os": [
+        "freebsd"
+      ],
+      "engines": {
+        "node": ">=18"
+      }
+    },
+    "node_modules/@esbuild/freebsd-x64": {
+      "version": "0.27.7",
+      "resolved": "https://registry.npmjs.org/@esbuild/freebsd-x64/-/freebsd-x64-0.27.7.tgz",
+      "integrity": "sha512-jOBDK5XEjA4m5IJK3bpAQF9/Lelu/Z9ZcdhTRLf4cajlB+8VEhFFRjWgfy3M1O4rO2GQ/b2dLwCUGpiF/eATNQ==",
+      "cpu": [
+        "x64"
+      ],
+      "dev": true,
+      "license": "MIT",
+      "optional": true,
+      "os": [
+        "freebsd"
+      ],
+      "engines": {
+        "node": ">=18"
+      }
+    },
+    "node_modules/@esbuild/linux-arm": {
+      "version": "0.27.7",
+      "resolved": "https://registry.npmjs.org/@esbuild/linux-arm/-/linux-arm-0.27.7.tgz",
+      "integrity": "sha512-RkT/YXYBTSULo3+af8Ib0ykH8u2MBh57o7q/DAs3lTJlyVQkgQvlrPTnjIzzRPQyavxtPtfg0EopvDyIt0j1rA==",
+      "cpu": [
+        "arm"
+      ],
+      "dev": true,
+      "license": "MIT",
+      "optional": true,
+      "os": [
+        "linux"
+      ],
+      "engines": {
+        "node": ">=18"
+      }
+    },
+    "node_modules/@esbuild/linux-arm64": {
+      "version": "0.27.7",
+      "resolved": "https://registry.npmjs.org/@esbuild/linux-arm64/-/linux-arm64-0.27.7.tgz",
+      "integrity": "sha512-RZPHBoxXuNnPQO9rvjh5jdkRmVizktkT7TCDkDmQ0W2SwHInKCAV95GRuvdSvA7w4VMwfCjUiPwDi0ZO6Nfe9A==",
+      "cpu": [
+        "arm64"
+      ],
+      "dev": true,
+      "license": "MIT",
+      "optional": true,
+      "os": [
+        "linux"
+      ],
+      "engines": {
+        "node": ">=18"
+      }
+    },
+    "node_modules/@esbuild/linux-ia32": {
+      "version": "0.27.7",
+      "resolved": "https://registry.npmjs.org/@esbuild/linux-ia32/-/linux-ia32-0.27.7.tgz",
+      "integrity": "sha512-GA48aKNkyQDbd3KtkplYWT102C5sn/EZTY4XROkxONgruHPU72l+gW+FfF8tf2cFjeHaRbWpOYa/uRBz/Xq1Pg==",
+      "cpu": [
+        "ia32"
+      ],
+      "dev": true,
+      "license": "MIT",
+      "optional": true,
+      "os": [
+        "linux"
+      ],
+      "engines": {
+        "node": ">=18"
+      }
+    },
+    "node_modules/@esbuild/linux-loong64": {
+      "version": "0.27.7",
+      "resolved": "https://registry.npmjs.org/@esbuild/linux-loong64/-/linux-loong64-0.27.7.tgz",
+      "integrity": "sha512-a4POruNM2oWsD4WKvBSEKGIiWQF8fZOAsycHOt6JBpZ+JN2n2JH9WAv56SOyu9X5IqAjqSIPTaJkqN8F7XOQ5Q==",
+      "cpu": [
+        "loong64"
+      ],
+      "dev": true,
+      "license": "MIT",
+      "optional": true,
+      "os": [
+        "linux"
+      ],
+      "engines": {
+        "node": ">=18"
+      }
+    },
+    "node_modules/@esbuild/linux-mips64el": {
+      "version": "0.27.7",
+      "resolved": "https://registry.npmjs.org/@esbuild/linux-mips64el/-/linux-mips64el-0.27.7.tgz",
+      "integrity": "sha512-KabT5I6StirGfIz0FMgl1I+R1H73Gp0ofL9A3nG3i/cYFJzKHhouBV5VWK1CSgKvVaG4q1RNpCTR2LuTVB3fIw==",
+      "cpu": [
+        "mips64el"
+      ],
+      "dev": true,
+      "license": "MIT",
+      "optional": true,
+      "os": [
+        "linux"
+      ],
+      "engines": {
+        "node": ">=18"
+      }
+    },
+    "node_modules/@esbuild/linux-ppc64": {
+      "version": "0.27.7",
+      "resolved": "https://registry.npmjs.org/@esbuild/linux-ppc64/-/linux-ppc64-0.27.7.tgz",
+      "integrity": "sha512-gRsL4x6wsGHGRqhtI+ifpN/vpOFTQtnbsupUF5R5YTAg+y/lKelYR1hXbnBdzDjGbMYjVJLJTd2OFmMewAgwlQ==",
+      "cpu": [
+        "ppc64"
+      ],
+      "dev": true,
+      "license": "MIT",
+      "optional": true,
+      "os": [
+        "linux"
+      ],
+      "engines": {
+        "node": ">=18"
+      }
+    },
+    "node_modules/@esbuild/linux-riscv64": {
+      "version": "0.27.7",
+      "resolved": "https://registry.npmjs.org/@esbuild/linux-riscv64/-/linux-riscv64-0.27.7.tgz",
+      "integrity": "sha512-hL25LbxO1QOngGzu2U5xeXtxXcW+/GvMN3ejANqXkxZ/opySAZMrc+9LY/WyjAan41unrR3YrmtTsUpwT66InQ==",
+      "cpu": [
+        "riscv64"
+      ],
+      "dev": true,
+      "license": "MIT",
+      "optional": true,
+      "os": [
+        "linux"
+      ],
+      "engines": {
+        "node": ">=18"
+      }
+    },
+    "node_modules/@esbuild/linux-s390x": {
+      "version": "0.27.7",
+      "resolved": "https://registry.npmjs.org/@esbuild/linux-s390x/-/linux-s390x-0.27.7.tgz",
+      "integrity": "sha512-2k8go8Ycu1Kb46vEelhu1vqEP+UeRVj2zY1pSuPdgvbd5ykAw82Lrro28vXUrRmzEsUV0NzCf54yARIK8r0fdw==",
+      "cpu": [
+        "s390x"
+      ],
+      "dev": true,
+      "license": "MIT",
+      "optional": true,
+      "os": [
+        "linux"
+      ],
+      "engines": {
+        "node": ">=18"
+      }
+    },
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     "node_modules/test-exclude": {
       "version": "6.0.0",
       "resolved": "https://registry.npmjs.org/test-exclude/-/test-exclude-6.0.0.tgz",
@@ -4873,9 +5564,9 @@
       }
     },
     "node_modules/test-exclude/node_modules/brace-expansion": {
-      "version": "1.1.12",
-      "resolved": "https://registry.npmjs.org/brace-expansion/-/brace-expansion-1.1.12.tgz",
-      "integrity": "sha512-9T9UjW3r0UW5c1Q7GTwllptXwhvYmEzFhzMfZ9H7FQWt+uZePjZPjBP/W1ZEyZ1twGWom5/56TF4lPcqjnDHcg==",
+      "version": "1.1.14",
+      "resolved": "https://registry.npmjs.org/brace-expansion/-/brace-expansion-1.1.14.tgz",
+      "integrity": "sha512-MWPGfDxnyzKU7rNOW9SP/c50vi3xrmrua/+6hfPbCS2ABNWfx24vPidzvC7krjU/RTo235sV776ymlsMtGKj8g==",
       "dev": true,
       "license": "MIT",
       "dependencies": {
@@ -4919,9 +5610,9 @@
       }
     },
     "node_modules/text-decoder": {
-      "version": "1.2.3",
-      "resolved": "https://registry.npmjs.org/text-decoder/-/text-decoder-1.2.3.tgz",
-      "integrity": "sha512-3/o9z3X0X0fTupwsYvR03pJ/DjWuqqrfwBgTQzdWDiQSm9KitAyz/9WqsT2JQW7KV2m+bC2ol/zqpW37NHxLaA==",
+      "version": "1.2.7",
+      "resolved": "https://registry.npmjs.org/text-decoder/-/text-decoder-1.2.7.tgz",
+      "integrity": "sha512-vlLytXkeP4xvEq2otHeJfSQIRyWxo/oZGEbXrtEEF9Hnmrdly59sUbzZ/QgyWuLYHctCHxFF4tRQZNQ9k60ExQ==",
       "dev": true,
       "license": "Apache-2.0",
       "dependencies": {
@@ -5182,16 +5873,17 @@
       }
     },
     "node_modules/wrap-ansi": {
-      "version": "7.0.0",
-      "resolved": "https://registry.npmjs.org/wrap-ansi/-/wrap-ansi-7.0.0.tgz",
-      "integrity": "sha512-YVGIj2kamLSTxw6NsZjoBxfSwsn0ycdesmc4p+Q21c5zPuZ1pl+NfxVdxPtdHvmNVOQ6XSYG4AUtyt/Fi7D16Q==",
+      "version": "9.0.2",
+      "resolved": "https://registry.npmjs.org/wrap-ansi/-/wrap-ansi-9.0.2.tgz",
+      "integrity": "sha512-42AtmgqjV+X1VpdOfyTGOYRi0/zsoLqtXQckTmqTeybT+BDIbM/Guxo7x3pE2vtpr1ok6xRqM9OpBe+Jyoqyww==",
+      "license": "MIT",
       "dependencies": {
-        "ansi-styles": "^4.0.0",
-        "string-width": "^4.1.0",
-        "strip-ansi": "^6.0.0"
+        "ansi-styles": "^6.2.1",
+        "string-width": "^7.0.0",
+        "strip-ansi": "^7.1.0"
       },
       "engines": {
-        "node": ">=10"
+        "node": ">=18"
       },
       "funding": {
         "url": "https://github.com/chalk/wrap-ansi?sponsor=1"
@@ -5216,6 +5908,68 @@
         "url": "https://github.com/chalk/wrap-ansi?sponsor=1"
       }
     },
+    "node_modules/wrap-ansi/node_modules/ansi-regex": {
+      "version": "6.2.2",
+      "resolved": "https://registry.npmjs.org/ansi-regex/-/ansi-regex-6.2.2.tgz",
+      "integrity": "sha512-Bq3SmSpyFHaWjPk8If9yc6svM8c56dB5BAtW4Qbw5jHTwwXXcTLoRMkpDJp6VL0XzlWaCHTXrkFURMYmD0sLqg==",
+      "license": "MIT",
+      "engines": {
+        "node": ">=12"
+      },
+      "funding": {
+        "url": "https://github.com/chalk/ansi-regex?sponsor=1"
+      }
+    },
+    "node_modules/wrap-ansi/node_modules/ansi-styles": {
+      "version": "6.2.3",
+      "resolved": "https://registry.npmjs.org/ansi-styles/-/ansi-styles-6.2.3.tgz",
+      "integrity": "sha512-4Dj6M28JB+oAH8kFkTLUo+a2jwOFkuqb3yucU0CANcRRUbxS0cP0nZYCGjcc3BNXwRIsUVmDGgzawme7zvJHvg==",
+      "license": "MIT",
+      "engines": {
+        "node": ">=12"
+      },
+      "funding": {
+        "url": "https://github.com/chalk/ansi-styles?sponsor=1"
+      }
+    },
+    "node_modules/wrap-ansi/node_modules/emoji-regex": {
+      "version": "10.6.0",
+      "resolved": "https://registry.npmjs.org/emoji-regex/-/emoji-regex-10.6.0.tgz",
+      "integrity": "sha512-toUI84YS5YmxW219erniWD0CIVOo46xGKColeNQRgOzDorgBi1v4D71/OFzgD9GO2UGKIv1C3Sp8DAn0+j5w7A==",
+      "license": "MIT"
+    },
+    "node_modules/wrap-ansi/node_modules/string-width": {
+      "version": "7.2.0",
+      "resolved": "https://registry.npmjs.org/string-width/-/string-width-7.2.0.tgz",
+      "integrity": "sha512-tsaTIkKW9b4N+AEj+SVA+WhJzV7/zMhcSu78mLKWSk7cXMOSHsBKFWUs0fWwq8QyK3MgJBQRX6Gbi4kYbdvGkQ==",
+      "license": "MIT",
+      "dependencies": {
+        "emoji-regex": "^10.3.0",
+        "get-east-asian-width": "^1.0.0",
+        "strip-ansi": "^7.1.0"
+      },
+      "engines": {
+        "node": ">=18"
+      },
+      "funding": {
+        "url": "https://github.com/sponsors/sindresorhus"
+      }
+    },
+    "node_modules/wrap-ansi/node_modules/strip-ansi": {
+      "version": "7.2.0",
+      "resolved": "https://registry.npmjs.org/strip-ansi/-/strip-ansi-7.2.0.tgz",
+      "integrity": "sha512-yDPMNjp4WyfYBkHnjIRLfca1i6KMyGCtsVgoKe/z1+6vukgaENdgGBZt+ZmKPc4gavvEZ5OgHfHdrazhgNyG7w==",
+      "license": "MIT",
+      "dependencies": {
+        "ansi-regex": "^6.2.2"
+      },
+      "engines": {
+        "node": ">=12"
+      },
+      "funding": {
+        "url": "https://github.com/chalk/strip-ansi?sponsor=1"
+      }
+    },
     "node_modules/wrappy": {
       "version": "1.0.2",
       "resolved": "https://registry.npmjs.org/wrappy/-/wrappy-1.0.2.tgz",
@@ -5255,43 +6009,79 @@
       }
     },
     "node_modules/yargs": {
-      "version": "17.7.2",
-      "resolved": "https://registry.npmjs.org/yargs/-/yargs-17.7.2.tgz",
-      "integrity": "sha512-7dSzzRQ++CKnNI/krKnYRV7JKKPUXMEh61soaHKg9mrWEhzFWhFnxPxGl+69cD1Ou63C13NUPCnmIcrvqCuM6w==",
+      "version": "18.0.0",
+      "resolved": "https://registry.npmjs.org/yargs/-/yargs-18.0.0.tgz",
+      "integrity": "sha512-4UEqdc2RYGHZc7Doyqkrqiln3p9X2DZVxaGbwhn2pi7MrRagKaOcIKe8L3OxYcbhXLgLFUS3zAYuQjKBQgmuNg==",
       "license": "MIT",
       "dependencies": {
-        "cliui": "^8.0.1",
+        "cliui": "^9.0.1",
         "escalade": "^3.1.1",
         "get-caller-file": "^2.0.5",
-        "require-directory": "^2.1.1",
-        "string-width": "^4.2.3",
+        "string-width": "^7.2.0",
         "y18n": "^5.0.5",
-        "yargs-parser": "^21.1.1"
+        "yargs-parser": "^22.0.0"
       },
       "engines": {
-        "node": ">=12"
+        "node": "^20.19.0 || ^22.12.0 || >=23"
       }
     },
     "node_modules/yargs-parser": {
-      "version": "21.1.1",
-      "resolved": "https://registry.npmjs.org/yargs-parser/-/yargs-parser-21.1.1.tgz",
-      "integrity": "sha512-tVpsJW7DdjecAiFpbIB1e3qxIQsE6NoPc5/eTdrbbIC4h0LVsWhnoa3g+m2HclBIujHzsxZ4VJVA+GUuc2/LBw==",
+      "version": "22.0.0",
+      "resolved": "https://registry.npmjs.org/yargs-parser/-/yargs-parser-22.0.0.tgz",
+      "integrity": "sha512-rwu/ClNdSMpkSrUb+d6BRsSkLUq1fmfsY6TOpYzTwvwkg1/NRG85KBy3kq++A8LKQwX6lsu+aWad+2khvuXrqw==",
+      "license": "ISC",
+      "engines": {
+        "node": "^20.19.0 || ^22.12.0 || >=23"
+      }
+    },
+    "node_modules/yargs/node_modules/ansi-regex": {
+      "version": "6.2.2",
+      "resolved": "https://registry.npmjs.org/ansi-regex/-/ansi-regex-6.2.2.tgz",
+      "integrity": "sha512-Bq3SmSpyFHaWjPk8If9yc6svM8c56dB5BAtW4Qbw5jHTwwXXcTLoRMkpDJp6VL0XzlWaCHTXrkFURMYmD0sLqg==",
+      "license": "MIT",
       "engines": {
         "node": ">=12"
+      },
+      "funding": {
+        "url": "https://github.com/chalk/ansi-regex?sponsor=1"
       }
     },
-    "node_modules/yargs/node_modules/cliui": {
-      "version": "8.0.1",
-      "resolved": "https://registry.npmjs.org/cliui/-/cliui-8.0.1.tgz",
-      "integrity": "sha512-BSeNnyus75C4//NQ9gQt1/csTXyo/8Sb+afLAkzAptFuMsod9HFokGNudZpi/oQV73hnVK+sR+5PVRMd+Dr7YQ==",
-      "license": "ISC",
+    "node_modules/yargs/node_modules/emoji-regex": {
+      "version": "10.6.0",
+      "resolved": "https://registry.npmjs.org/emoji-regex/-/emoji-regex-10.6.0.tgz",
+      "integrity": "sha512-toUI84YS5YmxW219erniWD0CIVOo46xGKColeNQRgOzDorgBi1v4D71/OFzgD9GO2UGKIv1C3Sp8DAn0+j5w7A==",
+      "license": "MIT"
+    },
+    "node_modules/yargs/node_modules/string-width": {
+      "version": "7.2.0",
+      "resolved": "https://registry.npmjs.org/string-width/-/string-width-7.2.0.tgz",
+      "integrity": "sha512-tsaTIkKW9b4N+AEj+SVA+WhJzV7/zMhcSu78mLKWSk7cXMOSHsBKFWUs0fWwq8QyK3MgJBQRX6Gbi4kYbdvGkQ==",
+      "license": "MIT",
       "dependencies": {
-        "string-width": "^4.2.0",
-        "strip-ansi": "^6.0.1",
-        "wrap-ansi": "^7.0.0"
+        "emoji-regex": "^10.3.0",
+        "get-east-asian-width": "^1.0.0",
+        "strip-ansi": "^7.1.0"
+      },
+      "engines": {
+        "node": ">=18"
+      },
+      "funding": {
+        "url": "https://github.com/sponsors/sindresorhus"
+      }
+    },
+    "node_modules/yargs/node_modules/strip-ansi": {
+      "version": "7.2.0",
+      "resolved": "https://registry.npmjs.org/strip-ansi/-/strip-ansi-7.2.0.tgz",
+      "integrity": "sha512-yDPMNjp4WyfYBkHnjIRLfca1i6KMyGCtsVgoKe/z1+6vukgaENdgGBZt+ZmKPc4gavvEZ5OgHfHdrazhgNyG7w==",
+      "license": "MIT",
+      "dependencies": {
+        "ansi-regex": "^6.2.2"
       },
       "engines": {
         "node": ">=12"
+      },
+      "funding": {
+        "url": "https://github.com/chalk/strip-ansi?sponsor=1"
       }
     },
     "node_modules/yocto-queue": {
diff --git a/package.json b/package.json
index 6a4c49fe..38d055c3 100644
--- a/package.json
+++ b/package.json
@@ -2,11 +2,12 @@
   "name": "@emacs-eask/cli",
   "version": "0.12.10",
   "description": "A set of command-line tools to build Emacs packages",
+  "type": "module",
   "main": "eask.js",
   "scripts": {
-    "test-unsafe": "cross-env ALLOW_UNSAFE=1 jest",
-    "test-debug": "cross-env DEBUG=1 jest",
-    "test": "jest",
+    "test-unsafe": "cross-env NODE_OPTIONS=--experimental-vm-modules ALLOW_UNSAFE=1 jest",
+    "test-debug": "cross-env NODE_OPTIONS=--experimental-vm-modules DEBUG=1 jest",
+    "test": "cross-env NODE_OPTIONS=--experimental-vm-modules jest",
     "test-reset": "rm -rf ./test/jest/.eask ./test/jest/*/.eask; git restore ./test/jest/*/",
     "pkg-all": "pkg package.json",
     "pkg-linux-arm64": "pkg package.json -t node*-linuxstatic-arm64 --output dist/eask --public",
@@ -33,10 +34,10 @@
   "license": "GPL-3.0-or-later",
   "dependencies": {
     "which": "^6.0.0",
-    "yargs": "^17.0.0"
+    "yargs": "^18.0.0"
   },
   "devDependencies": {
-    "@yao-pkg/pkg": "^6.0.0",
+    "@yao-pkg/pkg": "^6.16.0",
     "cross-env": "^10.1.0",
     "jest": "^30.3.0",
     "semver-compare": "^1.0.0"
diff --git a/src/env.js b/src/env.js
index 9f29fdac..048da7f8 100644
--- a/src/env.js
+++ b/src/env.js
@@ -17,30 +17,29 @@
 
 "use strict";
 
-const os = require('os');
-const path = require('path');
+import os from 'os';
+import path from 'path';
 
-global.UTIL = require('./util');
-global.IS_PKG = path.basename(process.execPath).startsWith('eask');
+export const IS_PKG = path.basename(process.execPath).startsWith('eask');
 
 /* Environment PATH */
-global.EASK_HOMEDIR = os.homedir().replace(/\\/g, '/') + '/.eask/';
+export const EASK_HOMEDIR = os.homedir().replace(/\\/g, '/') + '/.eask/';
 
-global.EASK_EMACS = process.env.EMACS || process.env.EASK_EMACS || "emacs";
+export const EASK_EMACS = process.env.EMACS || process.env.EASK_EMACS || "emacs";
 process.env.EMACS = EASK_EMACS;  // Set back the value.
 
 /* Titles */
-global.TITLE_CMD_OPTION = 'Command Options:';
-global.TITLE_PROXY_OPTION = 'Proxy Options:';
+export const TITLE_CMD_OPTION = 'Command Options:';
+export const TITLE_PROXY_OPTION = 'Proxy Options:';
 
 /* Exit Code
  *
  * This must match with the variable `eask--exit-code` in
  * the file `lisp/_prepare.el`.
  */
-global.EXIT_SUCCESS = 0;
-global.EXIT_FAILURE = 1;
-global.EXIT_MISUSE  = 2;
+export const EXIT_SUCCESS = 0;
+export const EXIT_FAILURE = 1;
+export const EXIT_MISUSE  = 2;
 
 /* CI */
-global.GITHUB_ACTIONS = (process.env.GITHUB_WORKSPACE !== undefined);
+export const GITHUB_ACTIONS = (process.env.GITHUB_WORKSPACE !== undefined);
diff --git a/src/util.js b/src/util.js
index cf562c54..b983ba78 100644
--- a/src/util.js
+++ b/src/util.js
@@ -17,23 +17,27 @@
 
 "use strict";
 
-const path = require('path');
-const child_process = require("child_process");
+import path from 'path';
+import child_process from 'child_process';
+import _which from 'which';
+import { IS_PKG, EASK_EMACS, EASK_HOMEDIR, GITHUB_ACTIONS, EXIT_FAILURE } from './env.js';
+
+const __dirname = import.meta.dirname;
 
 /**
  * Check to see if a program is installed and exists on the path.
  * @param { String } command - Program name.
  * @return Return path or null if not found.
  */
-function which(command) {
-  return require('which').sync(command, { nothrow: true });
+export function which(command) {
+  return _which.sync(command, { nothrow: true });
 }
 
 /**
  * Convert Windows backslash paths to slash paths: `foo\\bar` -> `foo/bar`
  * @see https://github.com/sindresorhus/slash
  */
-function slash(path) {
+export function slash(path) {
   const isExtendedLengthPath = path.startsWith('\\\\?\\');
   if (isExtendedLengthPath) {
     return path;
@@ -46,14 +50,14 @@ function slash(path) {
  * @param { String } str - String to escape string.
  * @return Escaped string.
  */
-function escape_str(str) {
+export function escape_str(str) {
   return str.replaceAll('\"', '\\"');
 }
 
 /**
  * Return arguments after matching string.
  */
-function take_after(arr, str) {
+export function take_after(arr, str) {
   let index = arr.indexOf(str);
   if (index === -1)
     return arr;
@@ -75,7 +79,7 @@ function _rest_args() {
  * @see https://github.com/emacs-eask/cli/issues/128
  * @param { Array } argv - Argument vector.
  */
-function cli_args(argv) {
+export function cli_args(argv) {
   let result = '';
   let first = true;
   argv.forEach(function (element) {
@@ -102,7 +106,7 @@ function _remove_undefined(arr) {
 }
 
 /* Return plugin directory */
-function plugin_dir() {
+export function plugin_dir() {
   let root = (IS_PKG) ? process.execPath : __dirname;
   return path.join(root, '..');
 }
@@ -112,7 +116,7 @@ function plugin_dir() {
  * @param { boolean } arg - argument receive from yargs.
  * @param { string } name - the flag representation in alias.
  */
-function def_flag(arg, name, val = undefined) {
+export function def_flag(arg, name, val = undefined) {
   if (arg === undefined)
     return undefined;
   if (val === undefined)
@@ -134,7 +138,7 @@ function _invocation() {
 /**
  * Setup the environment variables so Emacs could receive them.
  */
-function setup_env() {
+export function setup_env() {
   /* Home Directory */
   process.env.EASK_INVOCATION = _invocation();
   process.env.EASK_HOMEDIR = EASK_HOMEDIR;
@@ -208,7 +212,7 @@ function _check_argv(argv) {
  * Form elisp script path.
  * @param { string } name - Name of the script without extension.
  */
-function el_script(name) {
+export function el_script(name) {
   let _script = 'lisp/' + name + '.el';
   let _path = path.join(plugin_dir(), _script);
   return _path;
@@ -233,7 +237,7 @@ function _environment_name (argv) {
  * @param { string } script - name of the script from `../lisp`
  * @param { string } args - the rest of the arguments
  */
-async function e_call(argv, script, ...args) {
+export async function e_call(argv, script, ...args) {
   if (!which(EASK_EMACS)) {
     console.warn("Emacs is not installed (cannot find `" + EASK_EMACS + "' executable)");
     return;
@@ -283,7 +287,7 @@ async function e_call(argv, script, ...args) {
  * Get the command count, not including options.
  * @return Return a size of the command array.
  */
-function cmd_count() {
+export function cmd_count() {
   let args = process.argv.slice(2);
   args = args.filter(elm => { return !elm.startsWith('-'); });
   return args.length;
@@ -295,28 +299,9 @@ function cmd_count() {
  * @param { integer } level - used to compare with command count.
  * @return Return a string to show command, else we return false.
  */
-function hide_cmd(description, level = 1) {
+export function hide_cmd(description, level = 1) {
   if ((process.argv.includes('--show-hidden'))
       || level <= cmd_count())  // When display in submenu!
     return description;
   return false;
 }
-
-
-/*
- * Module Exports
- */
-module.exports.which = which;
-module.exports.slash = slash;
-
-module.exports.escape_str = escape_str;
-module.exports.take_after = take_after;
-module.exports.cli_args = cli_args;
-module.exports.plugin_dir = plugin_dir;
-module.exports.def_flag = def_flag;
-module.exports.setup_env = setup_env;
-module.exports.el_script = el_script;
-module.exports.e_call = e_call;
-
-module.exports.hide_cmd = hide_cmd;
-module.exports.cmd_count = cmd_count;
diff --git a/test/jest/analyze.test.js b/test/jest/analyze.test.js
index 1054be49..744ad036 100644
--- a/test/jest/analyze.test.js
+++ b/test/jest/analyze.test.js
@@ -1,4 +1,4 @@
-const { TestContext } = require("./helpers");
+import { TestContext } from "./helpers.js";
 
 /**
  * Clean output and attempt to parse as JSON.
diff --git a/test/jest/compile.test.js b/test/jest/compile.test.js
index 53cdfee7..7d793e8d 100644
--- a/test/jest/compile.test.js
+++ b/test/jest/compile.test.js
@@ -1,4 +1,4 @@
-const { TestContext } = require("./helpers");
+import { TestContext } from "./helpers.js";
 
 describe("compile", () => {
   const ctx = new TestContext("./test/jest/compile");
diff --git a/test/jest/config.test.js b/test/jest/config.test.js
index 432f2bc3..f5b61aa0 100644
--- a/test/jest/config.test.js
+++ b/test/jest/config.test.js
@@ -1,7 +1,7 @@
-const { testUnsafe, TestContext } = require("./helpers");
-const fs = require("node:fs/promises");
-const path = require("node:path");
-const process = require("node:process");
+import fs from "node:fs/promises";
+import path from "node:path";
+import process from "node:process";
+import { testUnsafe, TestContext } from "./helpers.js";
 
 describe("config param", () => {
   const ctx = new TestContext();
diff --git a/test/jest/docker.test.js b/test/jest/docker.test.js
index 4e0eff8e..1423d55f 100644
--- a/test/jest/docker.test.js
+++ b/test/jest/docker.test.js
@@ -1,4 +1,4 @@
-const { TestContext } = require("./helpers");
+import { TestContext } from "./helpers.js";
 
 describe("docker", () => {
   const ctx = new TestContext("./test/jest/docker");
diff --git a/test/jest/emacs.test.js b/test/jest/emacs.test.js
index d35d9252..a6781a90 100644
--- a/test/jest/emacs.test.js
+++ b/test/jest/emacs.test.js
@@ -1,4 +1,4 @@
-const { TestContext } = require("./helpers");
+import { TestContext } from "./helpers.js";
 
 describe("emacs", () => {
   const ctx = new TestContext("./test/jest/empty");
diff --git a/test/jest/exec.test.js b/test/jest/exec.test.js
index 6df6915f..d7764d30 100644
--- a/test/jest/exec.test.js
+++ b/test/jest/exec.test.js
@@ -1,4 +1,4 @@
-const { emacsVersion, TestContext } = require("./helpers");
+import { TestContext } from "./helpers.js";
 
 describe("exec", () => {
   const ctx = new TestContext("./test/jest/exec");
diff --git a/test/jest/exit-status.test.js b/test/jest/exit-status.test.js
index f028d0af..86951d04 100644
--- a/test/jest/exit-status.test.js
+++ b/test/jest/exit-status.test.js
@@ -1,4 +1,4 @@
-const { TestContext } = require("./helpers");
+import { TestContext } from "./helpers.js";
 
 describe("exit-status", () => {
   const ctx = new TestContext("./test/jest/empty");
diff --git a/test/jest/global.test.js b/test/jest/global.test.js
index e24f54f5..f857a149 100644
--- a/test/jest/global.test.js
+++ b/test/jest/global.test.js
@@ -1,8 +1,7 @@
-const fs = require("node:fs/promises");
-const path = require("node:path");
-const process = require("node:process");
-
-const { testUnsafe, TestContext } = require("./helpers");
+import fs from "node:fs/promises";
+import path from 'node:path';
+import process  from "node:process";
+import { testUnsafe, TestContext } from "./helpers.js";
 
 describe("global", () => {
   // global => install to ~/.eask
diff --git a/test/jest/helpers.js b/test/jest/helpers.js
index df0b3d7d..485cd185 100644
--- a/test/jest/helpers.js
+++ b/test/jest/helpers.js
@@ -1,10 +1,9 @@
-const util = require("node:util");
-const exec = util.promisify(require("node:child_process").exec);
-const fs = require("node:fs/promises");
-const path = require("node:path");
+import util from 'node:util';
+import { exec as execCallback } from 'node:child_process';
+import fs from 'node:fs/promises';
+import path from 'node:path';
 
-// Load the environment.
-const env = require('../../src/env');
+export const exec = util.promisify(execCallback);
 
 /*
  * This file uses JsDoc syntax.
@@ -19,7 +18,7 @@ const env = require('../../src/env');
  * @param {function({ fail: function }): void | function(): PromiseLike.<unknown>} fn
  * @param {number} [timeout]
  */
-function testUnsafe(name, fn, timeout) {
+export function testUnsafe(name, fn, timeout) {
   if (process.env.ALLOW_UNSAFE) {
     return test(name, fn, timeout);
   } else {
@@ -32,7 +31,7 @@ function testUnsafe(name, fn, timeout) {
  * This is used in TestContext to limit `exec`.
  * @returns {number}
  */
-function getTimeout() {
+export function getTimeout() {
   // parseInt returns NaN if it fails
   // TIMEOUT <= 0 will be ignored too
   return Number.parseInt(process.env.TIMEOUT) || 25000;
@@ -43,7 +42,7 @@ function getTimeout() {
  * You can compare lexicographically, e.g. if ((await emacsVersion()) > "27") { ... }
  * @returns {Promise.<string>} emacs version string.
  */
-async function emacsVersion() {
+export async function emacsVersion() {
   const text = await exec("emacs --version");
   const version = text.stdout.match("Emacs ([^ ]+)")?.[1];
   if (!version) {
@@ -62,7 +61,7 @@ async function stripAnsi(s) {
 }
 
 /** Provides transformations on output of node.exec(). */
-class CommandOutput {
+export class CommandOutput {
   constructor(output, cwd) {
     this.stderr = output.stderr;
     this.stdout = output.stdout;
@@ -142,7 +141,7 @@ class CommandOutput {
   }
 }
 
-class TestContext {
+export class TestContext {
   /**
    * @param {string} cwd Current Working Directory, used for all commands.
    */
@@ -251,11 +250,3 @@ class TestContext {
     return new CommandOutput(e, this.cwd);
   }
 }
-
-module.exports = {
-  testUnsafe,
-  emacsVersion,
-  TestContext,
-  getTimeout,
-  CommandOutput,
-};
diff --git a/test/jest/helpers.test.js b/test/jest/helpers.test.js
index 888017a7..037ae21a 100644
--- a/test/jest/helpers.test.js
+++ b/test/jest/helpers.test.js
@@ -1,5 +1,5 @@
-const { CommandOutput } = require("./helpers");
-const path = require("node:path");
+import path from 'node:path';
+import { CommandOutput } from "./helpers.js";
 
 describe("CommandOutput", () => {
   describe("sanitizeString", () => {
diff --git a/test/jest/install.test.js b/test/jest/install.test.js
index 43c0832a..067632ce 100644
--- a/test/jest/install.test.js
+++ b/test/jest/install.test.js
@@ -1,5 +1,5 @@
-const cmp = require('semver-compare');
-const { emacsVersion, TestContext } = require("./helpers");
+import cmp from 'semver-compare';
+import { emacsVersion, TestContext } from "./helpers.js";
 
 describe("install and uninstall", () => {
   describe("in ./install", () => {
diff --git a/test/jest/link.test.js b/test/jest/link.test.js
index 04633991..5cf7d114 100644
--- a/test/jest/link.test.js
+++ b/test/jest/link.test.js
@@ -1,4 +1,4 @@
-const { TestContext } = require("./helpers");
+import { TestContext } from "./helpers.js";
 
 describe("link", () => {
   describe("in ./link", () => {
diff --git a/test/jest/lint.test.js b/test/jest/lint.test.js
index aeed67b5..7c12e04d 100644
--- a/test/jest/lint.test.js
+++ b/test/jest/lint.test.js
@@ -1,4 +1,4 @@
-const { TestContext } = require("./helpers");
+import { TestContext } from "./helpers.js";
 
 describe("lint", () => {
   const ctx = new TestContext("./test/jest/lint");
diff --git a/test/jest/local.test.js b/test/jest/local.test.js
index 8c3d505b..33f74494 100644
--- a/test/jest/local.test.js
+++ b/test/jest/local.test.js
@@ -4,8 +4,8 @@
 // Notice, below we clone a random package (repo) that uses Eask as the
 // dependencies management tool.
 
-const cmp = require('semver-compare');
-const { emacsVersion, TestContext } = require("./helpers");
+import cmp from 'semver-compare';
+import { emacsVersion, TestContext } from "./helpers.js";
 
 describe("local", () => {
   const cwd = "./test/jest/local";
diff --git a/test/jest/local/Eask b/test/jest/local/Eask
index 10dde27f..a4ace4bc 100644
--- a/test/jest/local/Eask
+++ b/test/jest/local/Eask
@@ -1,7 +1,7 @@
 ;; -*- mode: eask; lexical-binding: t -*-
 
 (package "mini.pkg.1"
-         "12.12.13"
+         "13.13.14"
          "Minimal test package")
 
 (website-url "https://github.com/emacs-eask/cli/tree/master/test/fixtures/mini.pkg.1")
diff --git a/test/jest/local/mini.pkg.1.el b/test/jest/local/mini.pkg.1.el
index 8ca0c23c..a8927b01 100644
--- a/test/jest/local/mini.pkg.1.el
+++ b/test/jest/local/mini.pkg.1.el
@@ -5,7 +5,7 @@
 
 ;; Author: Shen, Jen-Chieh <jcs090218@gmail.com>
 ;; URL: https://github.com/emacs-eask/cli/tree/master/test/fixtures/mini.pkg.1
-;; Version: 12.12.13
+;; Version: 13.13.14
 ;; Package-Requires: ((emacs "24.3") (s "1.12.0") (fringe-helper "1.0.1"))
 ;; Keywords: test local
 
diff --git a/test/jest/options.test.js b/test/jest/options.test.js
index e44181ce..66e9de06 100644
--- a/test/jest/options.test.js
+++ b/test/jest/options.test.js
@@ -1,4 +1,5 @@
-const { TestContext } = require("./helpers");
+import { EXIT_FAILURE } from "../../src/env.js";
+import { TestContext } from "./helpers.js";
 
 describe("options", () => {
   const ctx = new TestContext("./test/jest/options");
diff --git a/test/jest/outdated-upgrade.test.js b/test/jest/outdated-upgrade.test.js
index 6ca117c4..51150da5 100644
--- a/test/jest/outdated-upgrade.test.js
+++ b/test/jest/outdated-upgrade.test.js
@@ -1,4 +1,4 @@
-const { emacsVersion, TestContext } = require("./helpers");
+import { TestContext } from "./helpers.js";
 
 describe("outdated and upgrade", () => {
   const ctx = new TestContext("./test/jest/outdated-upgrade");
diff --git a/test/jest/search.test.js b/test/jest/search.test.js
index b1a158e9..a8ac1688 100644
--- a/test/jest/search.test.js
+++ b/test/jest/search.test.js
@@ -1,4 +1,4 @@
-const { TestContext } = require("./helpers");
+import { TestContext } from "./helpers.js";
 
 describe("search", () => {
   const cwd = "./test/jest/search";
diff --git a/test/jest/test-buttercup.test.js b/test/jest/test-buttercup.test.js
index 7b7293de..fbb1bf27 100644
--- a/test/jest/test-buttercup.test.js
+++ b/test/jest/test-buttercup.test.js
@@ -1,4 +1,4 @@
-const { TestContext } = require("./helpers");
+import { TestContext } from "./helpers.js";
 
 describe("buttercup", () => {
   const ctx = new TestContext("./test/jest/buttercup");
diff --git a/test/jest/test-ecukes.test.js b/test/jest/test-ecukes.test.js
index 4a525b2f..e133152d 100644
--- a/test/jest/test-ecukes.test.js
+++ b/test/jest/test-ecukes.test.js
@@ -1,4 +1,4 @@
-const { TestContext } = require("./helpers");
+import { TestContext } from "./helpers.js";
 
 describe("test_ecukes", () => {
   const ctx = new TestContext("./test/jest/ecukes");
diff --git a/test/jest/test-ert-runner.test.js b/test/jest/test-ert-runner.test.js
index c40486b0..78c45d19 100644
--- a/test/jest/test-ert-runner.test.js
+++ b/test/jest/test-ert-runner.test.js
@@ -1,4 +1,4 @@
-const { TestContext } = require("./helpers");
+import { TestContext } from "./helpers.js";
 
 describe("test ert-runner", () => {
   const ctx = new TestContext("./test/jest/ert-runner");
diff --git a/test/jest/test-ert.test.js b/test/jest/test-ert.test.js
index c44a8697..b404b488 100644
--- a/test/jest/test-ert.test.js
+++ b/test/jest/test-ert.test.js
@@ -1,4 +1,4 @@
-const { TestContext } = require("./helpers");
+import { TestContext } from "./helpers.js";
 
 describe("test-ert", () => {
   const ctx = new TestContext("./test/jest/ert");
diff --git a/test/jest/upgrade-eask.test.js b/test/jest/upgrade-eask.test.js
index 10c2b9a8..2a97e53a 100644
--- a/test/jest/upgrade-eask.test.js
+++ b/test/jest/upgrade-eask.test.js
@@ -1,4 +1,4 @@
-const { testUnsafe, TestContext } = require("./helpers");
+import { testUnsafe, TestContext } from "./helpers.js";
 
 describe("upgrade-eask", () => {
   const ctx = new TestContext();