@babel/plugin-proposal-explicit-resource-management

This plugin enables Babel to transform using declarations using handler = await read();.

Example

input.js

using handlerSync = openSync();
await using handlerAsync = await openAsync();

will be transformed to

output.js

try {
  var _stack = [];
  var handlerSync = babelHelpers.using(_stack, openSync());
  var handlerAsync = babelHelpers.using(_stack, await openAsync(), true);
} catch (_) {
  var _error = _;
  var _hasError = true;
} finally {
  await babelHelpers.dispose(_stack, _error, _hasError);
}

Try it on the REPL.

Installation

npm

npm install --save-dev @babel/plugin-proposal-explicit-resource-management

Yarn

yarn add --dev @babel/plugin-proposal-explicit-resource-management

pnpm

pnpm add --save-dev @babel/plugin-proposal-explicit-resource-management

Usage

With a configuration file (Recommended)

babel.config.json

{
  "plugins": ["@babel/plugin-proposal-explicit-resource-management"]
}

Via CLI

Shell

babel --plugins @babel/plugin-proposal-explicit-resource-management script.js

Via Node API

JavaScript

require("@babel/core").transformSync("code", {
  plugins: ["@babel/plugin-proposal-explicit-resource-management"]
});

References

• Proposal: ECMAScript Explicit Resource Management