lib: add Math.sumPrecise type definition (ES2025)#63429
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Math.sumPrecise is part of the TC39 proposal-math-sum which reached Stage 4 on 2025-07-28, making it part of ES2026. Already implemented in Firefox 137+, Safari 18.4, and Bun, but not yet in V8/Node.js. Adds src/lib/esnext.math.d.ts with the Math interface extension, and wires it into esnext.d.ts and libs.json. Fixes microsoft#63427
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Summary
Adds type definition for
Math.sumPrecisewhich is part of the TC39proposal-math-sumthat reached Stage 4 on 2025-07-28, making it part of ES2026.Changes
src/lib/esnext.math.d.ts— extendsinterface MathwithsumPrecisesrc/lib/esnext.d.ts— added/// <reference lib="esnext.math" />src/lib/libs.json— registeredesnext.mathin the libs arraysrc/compiler/commandLineParser.ts— mappedesnext.mathlib name to filesrc/compiler/utilities.ts— addedsumPrecisetoScriptTargetFeaturesfor helpful diagnosticsWhy esnext, not es2025?
The proposal reached Stage 4 on 2025-07-28, one month after ES2025 was finalized (June 2025), so it will be included in ES2026. TypeScript does not have
es2026lib files yet, soesnextis the correct placement for now.Runtime support
References
AI Disclosure
This PR was developed with AI assistance (Claude by Anthropic) for research, code generation, and verification against the TC39 spec, MDN, and runtime implementations.
Fixes #63427