Repository: lyft/universal-async-component
Branch: master
Commit: 871759022aef
Files: 13
Total size: 19.5 KB

Directory structure:
gitextract_czb95q06/

├── .gitignore
├── .npmignore
├── CODE_OF_CONDUCT.md
├── CaptureChunks.tsx
├── LICENSE.md
├── NOTICE
├── README.md
├── getComponentAsync.tsx
├── global.d.ts
├── index.ts
├── package.json
├── tsconfig.json
└── webpack.ts

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FILE CONTENTS
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================================================
FILE: .gitignore
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node_modules
*.js
*.log
*.d.ts
!global.d.ts


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FILE: .npmignore
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node_modules
*.log


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FILE: CODE_OF_CONDUCT.md
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This project is governed by [Lyft's code of conduct](https://github.com/lyft/code-of-conduct). All contributors and participants agree to abide by its terms.


================================================
FILE: CaptureChunks.tsx
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/// <reference path="./global.d.ts" />

import * as React from 'react';

export interface CaptureChunksProps {
    /** Output of webpack stats when "chunks" filed is enabled */
    statsChunks: Array<{
        id: string;
        modules: Array<{
            name: string;
            id: string;
        }>;
    }>;
    /** Pass an empty array to get required chunks pushed to it */
    additionalChunks: Array<string>;
}

/**
 * Capture additional chunks required to render the children.
 * This works with the SyncImportServer TypeScript transformer and UniversalLazyComponent components
 */
export const CaptureChunks: React.StatelessComponent<CaptureChunksProps> =
({ statsChunks, additionalChunks, children }) => {
    if (typeof global !== 'undefined') {
        global.__webpack_report_dynamic_module__ = (moduleId) => {
            statsChunks.forEach(chunk => {
                chunk.modules.forEach(module => {
                    if (module.id === moduleId) {
                        additionalChunks.push(chunk.id);
                    }
                });
            });
        }
    }
    return React.Children.only(children);
}


================================================
FILE: LICENSE.md
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================================================
FILE: NOTICE
================================================
universal-async-component
Copyright 2016-2017 Lyft Inc.

This product includes software developed at Lyft Inc.


================================================
FILE: README.md
================================================
# Universal Async Component

Async component that works in server and client. It will allows code splitting that works for universal apps.

## What is this?
This is solving the [hard problem](https://github.com/ReactTraining/react-router/blob/d64ed0150b41df02b083f090b6682261c819a91e/packages/react-router-dom/docs/guides/code-splitting.md#code-splitting--server-rendering) of mixing code splitting and server side rendering. To avoid "flash of contents" in the initial page load server must include dynamic chunks required to render that screen in the HTML response. Using this library and adding corresponding components to your build system you can achieve that.


## Example project
See the [**example repo**](https://github.com/mohsen1/universal-async-component-example)

## Usage

```js
import { getComponentAsync } from 'universal-async-component';

const AsyncHelloWorld = getComponentAsync({ loader: () => import('./hello') });

const App = () => <AsyncHelloWorld />
```

## Server side rendering

To make server-side rendering work you should update your server code to collect additional required chunks and also update your Webpack config to replace `import()` calls with something special that makes all of this work.

### 1. Add `CaptureChunks`
Wrap you app with `CaptureChunks` in your server renderer. You need to provide Webpack client side stats to it. Also, pass an empty array

```jsx
const additionalChunks = [];
var htmlString = ReactDOM.renderToString(
    <CaptureChunks statsChunks={clientStats.chunks} additionalChunks={additionalChunks}>
        <App />
    </CaptureChunks>
);
```
After above code is run, `additionalChunks` is populated with all chunkIds that is required to render current `App`.

Use Webpack [`StatsPlugin`](https://www.npmjs.com/package/webpack-stats-plugin) you can write the stats to disk:

```js
new StatsPlugin({
    filename: 'client-stats.json',
    fields: ['chunks', 'publicPath', 'assets'],
})
```

### 2. Use `additionalChunks`
Use `additionalChunks` retrieved from `CaptureChunks` to append required chunks

```js
res.send(`
<html>
    <body>
        <div id="root">${htmlString}</div>
        <script src="webpack-bootstrap.js"></script>
        ${additionalChunks.map(chunkId => `<script src="${chunksId}.client.js"></script>`)}
        <script src="client.js"></script>
    </body>
</html>
`)
```
Note that additional chunks must come before the main bundle and after Webpack bootstrap script. It's easy to extract out Webpack bootstrap by using `CommonsChunkPlugin` plugin:

```js
new webpack.optimize.CommonsChunkPlugin({
    names: ['bootstrap'],
    filename: 'webpack-bootstrap.js',
    minChunks: Infinity
}),
```

### 3. Add `"string-replace-loader"`
Add `"string-replace-loader"` before any of other loaders in your **client and server** Webpack config and require options from `"universal-async-component"`:

```js
const { stringReplaceLoaderOptions } = require('universal-async-component');
const config = {
    rules: [
        test: /\.jsx?/,
        use: {
            loader: "string-replace-loader",
            options: stringReplaceLoaderOptions,
        },
    ],
}
```
Note: this will go away once React can render async components






================================================
FILE: getComponentAsync.tsx
================================================
import * as  React from 'react';

export type ModuleNamespace = any; // TODO

/** Props passed to the loading component */
export interface LoadingProps {
    isLoading: boolean;
    error: any;
    timedOut: boolean;
}

export interface GetComponentAsyncConfiguration<T> {
    /** A function that returns promise of a module namespace or a module namespace */
    loader: () => Promise<ModuleNamespace> & { resolvedValue?: ModuleNamespace };
    /** Props to pass to loaded component */
    props?: T;
    /** Loading component */
    loading?: React.ComponentType<LoadingProps>;
    /** Exported member of module returned by the loader function */
    exportKey?: string;
    /** Timeout to give up loading (in milliseconds) */
    timeout?: number;
}

/**
 * Get a component asynchronously by providing a loader function that resolves to the module that contains
 * the component.
 */
export function getComponentAsync<T>(getComponentAsyncProps: GetComponentAsyncConfiguration<T>) {

    return class AsyncComponent extends React.Component<{}, { ResultComponent: React.ComponentType<T> }> {
        state = { ResultComponent: null as any };

        componentWillMount() {
            const exportKey = getComponentAsyncProps.exportKey || 'default';
            const loaderResult = getComponentAsyncProps.loader();
            if (loaderResult.resolvedValue) {
                this.setState({ ResultComponent: loaderResult.resolvedValue[exportKey] });
            } else {
                loaderResult.then(result => {
                    this.setState({ ResultComponent: result[exportKey] });
                });
            }
        }

        render() {
            // TODO: Timeout
            if (this.state.ResultComponent) {
                return <this.state.ResultComponent />
            }
            if (getComponentAsyncProps.loading) {
                return <getComponentAsyncProps.loading isLoading={true} error={null} timedOut={false} />
            }
            return null;
        }
    }
}



================================================
FILE: global.d.ts
================================================
declare module NodeJS {
    export interface Global {
        /** Report a dynamic module is being required and sent in sync instead */
        __webpack_report_dynamic_module__?: (moduleId: string | number) => void;
    }
}


================================================
FILE: index.ts
================================================
export * from './CaptureChunks';
export * from './getComponentAsync';
export * from './webpack';


================================================
FILE: package.json
================================================
{
  "name": "universal-async-component",
  "version": "1.0.1",
  "description": "Universal Async Component",
  "main": "index.js",
  "repository": {
    "type": "git",
    "url": "git@github.com:lyft/universal-async-component.git"
  },
  "author": "Mohsen Azimi <me@azimi.me>",
  "license": {
    "type": "Apache-2.0",
    "url": "https://github.com/lyft/universal-async-component/LICENSE"
  },
  "typeings": "./index.d.ts",
  "peerDependencies": {
    "react": "^15.6.1"
  },
  "devDependencies": {
    "@types/node": "^8.0.15",
    "@types/react": "^15.0.38",
    "@types/webpack": "^3.0.5",
    "typescript": "^2.4.2"
  },
  "scripts": {
    "prepublish": "tsc"
  }
}


================================================
FILE: tsconfig.json
================================================
{
    "compilerOptions": {
        "jsx": "react",
        "declaration": true
    }
}


================================================
FILE: webpack.ts
================================================
const replace =
`/* import($1) */(function() {
    var __module_id__ = require.resolveWeak($1)
    var __module_sync__
    if (__webpack_modules__ && __webpack_modules__[__module_id__]) {
        if (typeof global !== "undefined" && typeof global.__webpack_report_dynamic_module__ === "function") {
            global.__webpack_report_dynamic_module__(__module_id__)
        }
        __module_sync__ = __webpack_require__(__module_id__);
    }
    var __promise__ = import($1)
    if (__module_sync__) { __promise__.resolvedValue = __module_sync__; }
    return __promise__;

})()`;

/** Provide this option object to "string-replace-loader" */
export const stringReplaceLoaderOptions =  {
    // This is a big hack until this issue is resolved:
    // https://github.com/webpack/webpack/issues/5344
    search: /import\((.*)\)/,
    replace,
};