Snippet

Explicit Resource Disposal via Symbol.dispose and using Declarations

The explicit resource management feature introduces the using declaration keyword. Objects implementing Symbol.dispose are automatically cleaned up when scope execution finishes, eliminating repetitive try/finally cleanup code.

snippet.js

javascript

class TempFile {
  #path;
  constructor(path) {
    this.#path = path;
  }
  [Symbol.dispose]() {
    console.log(`Cleaned resource at ${this.#path}`);
  }
}
 
function processFile() {
  using file = new TempFile('/tmp/session.lock');
  console.log('Processing data...');
}
processFile();

nodejs

Breakdown

[Symbol.dispose]() {

Defines the standard disposal method invoked automatically upon scope exit.

using file = new TempFile('/tmp/session.lock');

Binds the object using the resource declaration keyword to ensure block-end teardown.

console.log('Processing data...');

Executes main block logic before automatic teardown occurs at the closing curly brace.

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Explicit Resource Disposal via Symbol.dispose and using Declarations

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