1. Explicit Resource Management 1.1 Core Syntax: using and await using 1.1.1 Block-scoped resource declaration The explicit resource management feature in ES2026 introduces using and await using declarations that bind resource cleanup to block scope, fundamentally changing how JavaScript handles disposable resources. These declarations operate similarly to const or let but with the critical addition of automatic disposal when execution leaves the containing block—whether through normal completion, exception, return , break , or continue . The block-scoped design ensures that resources are tied to precise lexical boundaries rather than function-level or global scope, enabling fine-grained lifetime control that was previously impossible without verbose manual management . The syntax integrates seamlessly with JavaScript's existing scoping constructs, including plain blocks, if statements, for loops, try blocks, and function bodies.…