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

这个插件使 Babel 能够使用声明 using handler = await read(); 进行转换。

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

示例​

¥Example

input.js
using handlerSync = openSync();
await using handlerAsync = await openAsync();

将转变为

¥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);
}

在 REPL 上试试。

¥Try it on the REPL.

安装​

¥Installation

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

用法​

¥Usage

¥With a configuration file (Recommended)

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

通过 CLI​

¥Via CLI

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

通过 Node API​

¥Via Node API

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

参考​

¥References