ES2026 brings several significant improvements to JavaScript. The Temporal API replaces the broken Date object with immutable, timezone-aware types. The 'using' and 'await using' declarations automate resource cleanup via Symbol.dispose, eliminating manual try/finally boilerplate. Error.isError() provides reliable cross-realm error detection. Array.fromAsync() simplifies collecting async iterables into arrays. Import attributes add explicit type safety to JSON/CSS imports. Math.sumPrecise() offers compensated floating-point summation. Browser and Node.js support is rolling out in 2026, with polyfills available for earlier adoption.
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The Temporal API: Finally Replacing DateExplicit Resource Management: using and await usingError.isError(): Fixing a Subtle FootgunArray.fromAsync(): Async Iteration Gets EasierImport Attributes: Type Safety for ImportsMath.sumPrecise(): When Number Addition Fails YouUsing ES2026 TodayWhat This Release Actually MeansThe Short Version11 Comments
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