ES2015 typeof symbol transform

示例

输入

typeof Symbol() === "symbol";

输出

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

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

npm install --save-dev babel-plugin-transform-es2015-typeof-symbol

.babelrc

{
  "plugins": ["transform-es2015-typeof-symbol"]
}

babel --plugins transform-es2015-typeof-symbol script.js

require("babel-core").transform("code", {
  plugins: ["transform-es2015-typeof-symbol"]
});