@babel/plugin-transform-typeof-symbol

信息

此插件包含在 @babel/preset-env 中

¥This plugin is included in @babel/preset-env

示例

¥Example

输入

¥In

JavaScript

typeof Symbol() === "symbol";

输出

¥Out

JavaScript

var _typeof = function(obj) {
  return obj && obj.constructor === Symbol ? "symbol" : typeof obj;
};

_typeof(Symbol()) === "symbol";

安装

¥Installation

npm

npm install --save-dev @babel/plugin-transform-typeof-symbol

Yarn

yarn add --dev @babel/plugin-transform-typeof-symbol

pnpm

pnpm add --save-dev @babel/plugin-transform-typeof-symbol

用法

¥Usage

使用配置文件（推荐）

¥With a configuration file (Recommended)

babel.config.json

{
  "plugins": ["@babel/plugin-transform-typeof-symbol"]
}

通过 CLI

¥Via CLI

Shell

babel --plugins @babel/plugin-transform-typeof-symbol script.js

通过 Node API

¥Via Node API

JavaScript

require("@babel/core").transformSync("code", {
  plugins: ["@babel/plugin-transform-typeof-symbol"],
});