在create-react-app创建的项目下允许函数绑定运算符
2019-12-15

前话

React的函数绑定一致是个问题,主要有下面几种方式:

事件处理器动态绑定

export default class Com extends React.Component { render() { <input type="button" value="点我" onClick={this.method.bind(this)} /> }}构造函数绑定

export default class CartItem extends React.Component { constructor(props) { super(props); this.method = this.method.bind(this); } render() { <input type="button" value="点我" onClick={this.method} /> }}构造函数 + 箭头函数

export default class CartItem extends React.Component { constructor(props) { super(props); this.method = (ev) => {...} } render() { <input type="button" value="点我" onClick={this.method} /> }}通过bael的babel-plugin-transform-class-properties

这个是babel支持的,还不是标准

export default class CartItem extends React.Component { method = () => {...}; render() { <input type="button" value="点我" onClick={this.method} /> }}stage 0 的 transform-function-bind

export default class CartItem extends React.Component { method = () => {...}; render() { <input type="button" value="点我" onClick={this.method} /> }}export default class CartItem extends React.Component { method(){...}; render() { <input type="button" value="点我" onClick={::this.method} /> }}

最后一种很帅气, 然并软,我使用就直接报错。 臣不服,不服。于是寻找方案, 因为是create-react-app创建的项目。我的思考方案如下

create-react-app内置支持的配置在awesome-create-react-app中找到how-to-use-custom-babel-presets, 看到了光芒,光芒啊。高兴太早,死的也早,Adding support for custom babel configuration被拒绝了,大致是,想法非常好,非常好,就是不能。那么,我走下一条路npm run eject采用eject后,会多出很多文件,并且是不可逆向的。恶心,恶心,那么多文件。我要出去透透气。react-app-rewired这个比较简单一些。寻寻觅觅找到了injectbabelplugin然后找到对应的插件babel-preset-stage-0,babel-plugin-transform-function-bind

const rewireMobX = require("react-app-rewire-mobx");const rewireEslint = require("react-app-rewire-eslint");const {injectBabelPlugin} = require("react-app-rewired");/* config-overrides.js */module.exports = { webpack: function override(config, env) { config = rewireEslint(config, env); config = rewireMobX(config, env); config = injectBabelPlugin("transform-function-bind",config) config.output.publicPath = "" return config; }}

修改完毕,启动,哦,可以。 真是不错。扔掉键盘,甩开鼠标,深深的一口水,想写行代码咋这么难。

React and ES6 - Part 3, Binding to methods of React class (ES7 included)decoratorcreate-react-apphow-to-use-custom-babel-presetsAdding support for custom babel configuration #1357react-app-rewiredinjectbabelpluginbabel-preset-stage-0babel-plugin-transform-function-bind