ES2026: The Latest Evolution of JavaScript — A Comprehensive Feature Overview

Short summary

ES2026 introduces `using` and `await using` declarations that automatically clean up resources when blocks exit, eliminating verbose try-finally boilerplate. Symbol.dispose and Symbol.asyncDispose protocols handle synchronous and asynchronous cleanup with sophisticated error aggregation via SuppressedError chains. Resources dispose in reverse order (LIFO), preventing use-after-free bugs in complex scenarios like nested database transactions.

• •`using`/`await using` declarations tie resource cleanup to block scope automatically
• •Symbol.dispose and Symbol.asyncDispose replace manual try-finally resource management
• •Multiple resources dispose in LIFO order with aggregated error handling via SuppressedError

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