A rundown of upcoming JavaScript ES2027 features: four stage-four proposals confirmed - the Temporal API for handling dates and time zones properly, explicit resource management (the 'using' keyword) for automatic cleanup, joint iteration (iterator.zip/zipKeyed) for combining iterables, and atomics.pause for efficient busy-waiting in multi-threaded code. Also covered are stage-three proposals close behind: import defer for lazy module execution, Promise.allSettled with named results, and decorators (shipped in Bun already). A stage-one proposal for built-in reactive signals is highlighted as potentially unifying reactivity across frameworks like Angular, Vue, Svelte, and Solid. Browser and runtime support status is noted throughout, with Temporal already available in Firefox, Chrome, Node.js, and Deno, while Safari and Bun lag behind on some features.
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