runtime


code>@babel/runtime</code is a library that contain’s Babel modular runtime helpers and a version of regenerator-runtime.

Installation

 sh
npm install --save @babel/runtime

See also: @babel/runtime-corejs2.

Usage

This is meant to be used as a runtime dependency along with the Babel plugin code>@babel/plugin-transform-runtime</code. Please check out the documentation in that package for usage.

Why

Sometimes Babel may inject some code in the output that is the same and thus can be potentially re-used.

For example, with the class transform (without loose mode):

Js中文网 – 前端进阶资源教程 www.javascriptC.com ,Babel中文文档
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 js
class Circle {}

turns into:

 js
function _classCallCheck(instance, Constructor) {
  //...
}

var Circle = function Circle() {
  _classCallCheck(this, Circle);
};

this means every file that contains a class would have the _classCallCheck function repeated each time.

With code>@babel/plugin-transform-runtime</code, it would replace the reference to the function to the code>@babel/runtime</code version.

 js
var _classCallCheck = require("@babel/runtime/helpers/classCallCheck");

var Circle = function Circle() {
  _classCallCheck(this, Circle);
};

code>@babel/runtime</code is just the package that contains the implementations of the functions in a modular way.

← helperstemplate →

来源:Js中文网 – 前端进阶资源教程
链接:https://www.javascriptc.com/docs/babel-manual/babel-runtime

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