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

此外掛程式讓 Babel 能使用宣告轉換 using handler = await read();。

範例​

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

將轉換為

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 上嘗試.

安裝​

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

用法​

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

透過 CLI​

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

透過 Node API​

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

參考​