不，webpack(类似于 browserify 和其他模块打包器)只会打包一次.

每个 react 组件都有自己的作用域，当它需要/导入另一个模块时，webpack 会检查所需的文件是否已经包含在包中.

所以不，它不会导致重复的代码.但是如果你导入一些外部打包的库，你可能会有一些重复的代码.在这种情况下，您可以使用 Webpack 的重复数据删除插件来查找这些文件并进行重复数据删除.有关更多信息:https://github.com/webpack/docs/wiki/optimization#去重

I have a React app which has many components importing the same modules. Does webpack import each module once for each file requesting it, resulting in duplicate code(in this case each import twice for just the two components)? I'm considering re-writing the components so that child components do not need to require the React modules, but maybe I'm solving a problem that doesn't exist. I'd like to avoid many imports of the same react module if it results in duplicate code.

Component 1

import React from "react";
import { Link } from "react-router";
import ReactLogo from "elements/ReactLogo";

export default class MainMenu extends React.Component {
    render() {
        return <div>
            <ReactLogo type="svg" /> <ReactLogo type="png" /> <ReactLogo type="jpg" />
            <h2>MainMenu:</h2>
            <ul>
                <li>The <Link to="home">home</Link> page.</li>
                <li>Do something on the <Link to="todo">todo page</Link>.</li>
                <li>Switch to <Link to="some-page">some page</Link>.</li>
                <li>Open the chat demo: <Link to="chat" params={{room: "home"}}>Chat</Link>.</li>
                <li>Open the page that shows <Link to="readme">README.md</Link>.</li>
            </ul>
        </div>;
    }
}

Component 2 importing the same 3 modules.

import React from "react";
import { Link } from "react-router";
import ReactLogo from "elements/ReactLogo";

export default class MainMenu extends React.Component {
    render() {
        return <div>
            <ReactLogo type="svg" /> <ReactLogo type="png" /> <ReactLogo type="jpg" />
            <h2>MainMenu:</h2>
            <ul>
                <li>The <Link to="home">home</Link> page.</li>
                <li>Do something on the <Link to="todo">todo page</Link>.</li>
                <li>Switch to <Link to="some-page">some page</Link>.</li>
                <li>Open the chat demo: <Link to="chat" params={{room: "home"}}>Chat</Link>.</li>
                <li>Open the page that shows <Link to="readme">README.md</Link>.</li>
            </ul>
        </div>;
    }
}

No, webpack (similar to browserify and other module bundlers) will only bundle it once.

Every react component will get its own scope, and when it requires/imports another module, webpack will check if the required file was already included or not in the bundle.

So no, it will not result in duplicate code. However if you import some external packaged libraries, you may have some duplicate code. In that case, you can use Webpack's Deduplication plugin to find these files and deduplicate them. More info here for that: https://github.com/webpack/docs/wiki/optimization#deduplication