我们如何避免样板code由巴贝尔transpiled文件？ [英] How do we avoid boilerplate code in files transpiled by Babel?

问题描述

例如，如果我跑

babel src --source-maps --out-dir . --modules common

这是我的项目的src文件夹，它输出的所有文件，但每个文件包含像

on the src folder of my project, it output all the files in ., but each and every file contains things like

var _createClass = (function () { function defineProperties(target, props) { for (var i = 0; i < props.length; i++) { var descriptor = props[i]; descriptor.enumerable = descriptor.enumerable || false; descriptor.configurable = true; if ('value' in descriptor) descriptor.writable = true; Object.defineProperty(target, descriptor.key, descriptor); } } return function (Constructor, protoProps, staticProps) { if (protoProps) defineProperties(Constructor.prototype, protoProps); if (staticProps) defineProperties(Constructor, staticProps); return Constructor; }; })();

var _get = function get(_x, _x2, _x3) { var _again = true; _function: while (_again) { var object = _x, property = _x2, receiver = _x3; desc = parent = getter = undefined; _again = false; if (object === null) object = Function.prototype; var desc = Object.getOwnPropertyDescriptor(object, property); if (desc === undefined) { var parent = Object.getPrototypeOf(object); if (parent === null) { return undefined; } else { _x = parent; _x2 = property; _x3 = receiver; _again = true; continue _function; } } else if ('value' in desc) { return desc.value; } else { var getter = desc.get; if (getter === undefined) { return undefined; } return getter.call(receiver); } } };

function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { 'default': obj }; }

function _classCallCheck(instance, Constructor) { if (!(instance instanceof Constructor)) { throw new TypeError('Cannot call a class as a function'); } }

function _inherits(subClass, superClass) { if (typeof superClass !== 'function' && superClass !== null) { throw new TypeError('Super expression must either be null or a function, not ' + typeof superClass); } subClass.prototype = Object.create(superClass && superClass.prototype, { constructor: { value: subClass, enumerable: false, writable: true, configurable: true } }); if (superClass) Object.setPrototypeOf ? Object.setPrototypeOf(subClass, superClass) : subClass.__proto__ = superClass; }

是它在某种程度上可能有通天写这些常见的样板东西到一个文件，然后使用需要在每个要导入​​的文件呢？因此，在每个文件样板code现在可能是这样的：

Is it somehow possible to have babel write these common boilerplate things to a file, then use require in each file to import them? So the boilerplate code in each file might now look like this:

var { _createClass, _get, _interopRequireDefault, _classCallCheck, _inherits } = require(`./babel-functions`)

和通天-functions.js 文件（或不管它应被命名）将位于 - 出DIR ，这是。在我的情况，所有的文件将有一个在顶部需要声明。文件夹中的文件将在要求（../通天函数），要求（../../通天函数）等

and the babel-functions.js file (or whatever it shall be named) would be located in the --out-dir, which is . in my case, and all files would have that require statement at the top. Files in folders would have require(../babel-functions), require(../../babel-functions), etc.

有一些类型的选择与巴别做这个（或类似）？

Is there some type of option to do this (or similar) with Babel?

推荐答案

通天塔提供，而不是内联它们，使用通天--external-助手使用外部佣工的能力，在命令行或 babel.transform（code，{externalHelpers：真}）; 通过API调用时，巴贝尔

Babel provides the ability to use external helpers, instead of inlining them, using babel --external-helpers on the command line or babel.transform("code", { externalHelpers: true }); when calling Babel through the API.

在使用这两种，巴贝尔将承担变量 babelHelpers 与它的助手定义。

When using either of these, Babel will assume a variable babelHelpers defined with it's helpers.

要求通天核心/外部佣工（安装后的通天塔芯从NPM）将注入佣工到全球节点。

Requiring babel-core/external-helpers (after installing babel-core from NPM) will inject the helpers into global on node.

生成和插入的佣工在文件记载的其他方法： https：//开头babeljs。 IO /文档/插件/外部佣工。

Other methods of generating and inserting the helpers are documented at the documentation: https://babeljs.io/docs/plugins/external-helpers.

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