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

Usage​

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​