ES2026 Solves JavaScript Headaches With Dates, Math and Modules

ECMAScript 2026 is set to introduce significant improvements to JavaScript, including Math.sumPrecise for more accurate floating-point calculations, Uint8Array base64 encoding methods, and enhanced JSON parsing with source text access. The release will improve internationalization with Intl.Locale enhancements for handling regional date/time formats and weekend variations. Major additions include the Temporal API to replace JavaScript's problematic Date object with better time zone handling and calendar support, explicit resource management with using blocks for automatic cleanup, and import defer for optimizing module loading performance. Additional features include Error.isError for reliable error checking, Iterator.concat for chaining iterators, Array.fromAsync for async iterables, and Map/WeakMap upsert operations.