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@babel/plugin-transform-typeof-symbol

7.0.0-beta.43
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  • License MIT

This transformer wraps all typeof expressions with a method that replicates native behaviour. (ie. returning “symbol” for symbols)

Package Exports

  • @babel/plugin-transform-typeof-symbol

This package does not declare an exports field, so the exports above have been automatically detected and optimized by JSPM instead. If any package subpath is missing, it is recommended to post an issue to the original package (@babel/plugin-transform-typeof-symbol) to support the "exports" field. If that is not possible, create a JSPM override to customize the exports field for this package.

Readme

@babel/plugin-transform-typeof-symbol

ES6 introduces a new native type called symbols. This transformer wraps all typeof expressions with a method that replicates native behaviour. (ie. returning "symbol" for symbols)

Example

In

typeof Symbol() === "symbol";

Out

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

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

Installation

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

Usage

.babelrc

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

Via CLI

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

Via Node API

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