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@babel/plugin-transform-instanceof

示例​

🌐 Example

在

JavaScript
foo instanceof Bar;

出

JavaScript
function _instanceof(left, right) {
  if (
    right != null &&
    typeof Symbol !== "undefined" &&
    right[Symbol.hasInstance]
  ) {
    return right[Symbol.hasInstance](left);
  } else {
    return left instanceof right;
  }
}

_instanceof(foo, Bar);

安装​

🌐 Installation

npm install --save-dev @babel/plugin-transform-instanceof

用法​

🌐 Usage

🌐 With a configuration file (Recommended)

babel.config.json
{
  "plugins": ["@babel/plugin-transform-instanceof"]
}

通过 CLI​

🌐 Via CLI

Shell
babel --plugins @babel/plugin-transform-instanceof script.js

通过 Node API​

🌐 Via Node API

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

参考​

🌐 References