rollup react 常见问题解决大法(转载)

(转载) Marvin's Blog【程式人生】

原文链接:https://marvinsblog.net/

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23Dec 2018

用Rollup打包Typescript和React

前端项目最麻烦的问题是如何解决代码间的依赖,以及如果打包代码。目前比较主流的代码打包工具有webpack和rollup。我比较喜欢后者,因为配置比较简单,而且一上来就支持es6.

我的需求是要把react和typescript打包到一起。react提供了一个工具Create React App,可以帮助你快速搭建一个react app项目。但是Create React App默认支持的是webpack,而不是我希望的rollup。所以本文研究如何用rollup来打包react和typescript。

实验过程

创建项目

首先创建一个项目demo,并添加react相关的依赖(react,react-dom):

mkdir demo
cd demo
yarn add react react-dom

上面的命令会在当前目录生成node_modules package.json yarn.lock

添加typescript

然后添加typescript到dev依赖中

yarn add --dev typescript

创建里面tsconfig.json文件,用来配置typescript,内容如下:

{
  "compilerOptions": {
    "target": "es6",
    "jsx": "react",
    "sourceMap": true,
    "module": "commonjs"
  },
  "exclude": [
    "node_modules"
  ]
}

上面的配置让typescript能够转译tsx文件(也就是ts版的jsx文件),并生成es6代码。

demo.tsx

现在来编写一个小例子demo.tsx,内容如下:

import * as React from "react";
import * as ReactDOM from "react-dom";

ReactDOM.render(
  

Hello, Welcome to the first page

, document.getElementById("root") );

可以使用./node_modules/.bin/tsc -b命令来编译上面的例子,会生成demo.js,其内容如下:

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
const React = require("react");
const ReactDOM = require("react-dom");
ReactDOM.render(React.createElement("div", null,
    React.createElement("h1", null, "Hello, Welcome to the first page")), document.getElementById("root"));
//# sourceMappingURL=demo.js.map

添加rollup

下面的命令在dev依赖中添加rollup以及rollup的两个plugin:rollup-plugin-commonjs和rollup-plugin-node-resolve

yarn add --dev rollup rollup rollup-plugin-commonjs rollup-plugin-node-resolve

我们还需要添加rollup的typescript相关的plugin

yarn add --dev rollup-plugin-typescript tslib

添加tslib,是因为它是rollup-plugin-typescript的peer依赖

创建rollup的配置文件rollup.config.js,添加以下内容

import typescript from 'rollup-plugin-typescript'
import commonjs from 'rollup-plugin-commonjs'
import resolve from 'rollup-plugin-node-resolve'

export default {
  input: './demo.tsx',
  output: {
    file: 'dist/index.js',
    format: 'iife',
    exports: 'named',
    sourcemap: true
  },
  plugins: [
    typescript(),
    resolve(),
    commonjs()
  ]
}

Missing exports错误

使用./node_modules/.bin/rollup -c来打包当前项目,不料却出现若干问题:

./demo.tsx → dist/index.js...
(!) Missing exports
https://rollupjs.org/guide/en#error-name-is-not-exported-by-module-
demo.tsx
render is not exported by node_modules/react-dom/index.js
...
createElement is not exported by node_modules/react/index.js
...
createElement is not exported by node_modules/react/index.js
...

解决办法一

一个解决办法是使用rollup-plugin-commonjs的custom-named-exports功能,这需要修改rollup.config.js的plugin配置中的commonjs部分:

    commonjs({
      namedExports: {
        'node_modules/react/index.js': ['createElement'],
        'node_modules/react-dom/index.js': ['render']
      }
    })

做完上述的配置后执行./node_modules/.bin/rollup -c,错误消除。

这个解题思路和StackOverflow的这个帖子一致

解决办法二

另一个解决办法,在Making of a component library for React一文中提到的,是在rollup.confg.js中把react和react-dom作为外部依赖。

修改rollup.config.js:

export default {
  input: './demo.tsx',
  output: {
    file: 'dist/index.js',
    format: 'iife',
    exports: 'named',
    sourcemap: true,
    // 添加globals
    globals: {
      react: 'React',
      'react-dom': 'ReactDOM'
    }
  },
  // 添加externs
  external: ['react', 'react-dom'],
  plugins: [
    typescript(),
    resolve(),
    // 取消之前对commonjs的配置
    commonjs()
  ]
}

这样做的好处是./node_modules/.bin/rollup -c执行非常快,因为不需要打包react和react-dom;坏处是需要自己在html中添加react和react-dom,例如:





上面的例子参考了react-rectangle-popup-menu

解决办法三

解决办法三和解决办法二相似,但是使用到了peer依赖。这个解决办法来自于create-react-library。它可以用来创建基于rollup和typescript的react库。

create-react-library把react和react-dom在package.json中列为了peerDependencies(在yarn add的时候指定–peer即可)。然后使用rollup-plugin-peer-deps-external插件,这个插件可以把让rollup把所有的peerDependencies当成external依赖处理。最后的效果跟解决办法二类似

解决办法四

如果我们在demo.tsx里面把下面的代码:

import * as React from "react";
import * as ReactDOM from "react-dom";

改成

import React from "react";
import ReactDOM from "react-dom";

那么错误有可能变成:

[!] Error: 'default' is not exported by node_modules/react-dom/index.js

有一个小戏法能够帮助解决这个问题,那就是在rollup.config.js中使用rollup-plugin-replace插件:

import replace from 'rollup-plugin-replace'
...
export default {
...
  plugins: [
    replace({ 'process.env.NODE_ENV': JSON.stringify('devolpment') }), // 或者production
...

在nodejs中把环境变量process.env.NODE_ENV改成development或者production,这个错误就会消失,实在不知道是为什么呢? buble-react-rollup-starter也是这样��做的。

其他参考

typescript和reactjs相关

  • [How & why: A guide to using Typescript with React](How & why: A guide to using Typescript with Reacthttps://blog.logrocket.com/how-why-a-guide-to-using-typescript-with-react-fffb76c61614)
  • ES6: import * as React vs import React
  • import fails with ‘no default export’ #8
  • Migrating from create-react-app-typescript to Create React App
  • What exactly is the ‘react-scripts start’ command?

rollup相关

  • Rollup - react.js does not export Component #643
  • NamedModules: cloneElement is not exported by react #345
  • Rollup Error: ‘isValidElementType’ is not exported by node_modules/react-is/index.js
  • Is “named exports” feature or bug? #211

nodejs依赖

  • https://yarnpkg.com/lang/en/docs/dependency-types/
  • http://npm.github.io/using-pkgs-docs/package-json/types/peerdependencies.html
  • https://nodejs.org/en/blog/npm/peer-dependencies/
  • https://stackoverflow.com/questions/26737819/why-use-peer-dependencies-in-npm-for-plugins

JS模块

  • how to use node.js module system on the clientside
  • Learn the basics of the JavaScript module system and build your own library

打包器

  • Webpack and Rollup: the same but different
  • Rollup v. Webpack v. Parcel

其他starter

  • Creating a React App… From Scratch.
  • https://github.com/Microsoft/TypeScript-React-Starter
  • Guide to building a React components library with Rollup and styled-jsx.
  • How I set-up a React component library with Rollup

Categories

frontend programming

Tags

reactjs rollupjs typescript

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