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Add instructions to use source-map-explorer #1641

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Jun 27, 2017
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Add instructions to use source-map-explorer #1641

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5d44850
Add instructions to use source-map-explorer
Feb 25, 2017
64d12fb
Merge branch 'master' into analyze-readme
gaearon Jun 27, 2017
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1 change: 1 addition & 0 deletions README.md
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Original file line number Diff line number Diff line change
Expand Up @@ -129,6 +129,7 @@ The [User Guide](https://github.com/facebookincubator/create-react-app/blob/mast
- [Running Tests](https://github.com/facebookincubator/create-react-app/blob/master/packages/react-scripts/template/README.md#running-tests)
- [Developing Components in Isolation](https://github.com/facebookincubator/create-react-app/blob/master/packages/react-scripts/template/README.md#developing-components-in-isolation)
- [Making a Progressive Web App](https://github.com/facebookincubator/create-react-app/blob/master/packages/react-scripts/template/README.md#making-a-progressive-web-app)
- [Analyzing the Bundle Size](https://github.com/facebookincubator/create-react-app/blob/master/packages/react-scripts/template/README.md#analyzing-the-bundle-size)
- [Deployment](https://github.com/facebookincubator/create-react-app/blob/master/packages/react-scripts/template/README.md#deployment)
- [Advanced Configuration](https://github.com/facebookincubator/create-react-app/blob/master/packages/react-scripts/template/README.md#advanced-configuration)
- [Troubleshooting](https://github.com/facebookincubator/create-react-app/blob/master/packages/react-scripts/template/README.md#troubleshooting)
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32 changes: 32 additions & 0 deletions packages/react-scripts/template/README.md
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Expand Up @@ -61,6 +61,7 @@ You can find the most recent version of this guide [here](https://github.com/fac
- [Editor Integration](#editor-integration)
- [Developing Components in Isolation](#developing-components-in-isolation)
- [Making a Progressive Web App](#making-a-progressive-web-app)
- [Analyzing the Bundle Size](#analyzing-the-bundle-size)
- [Deployment](#deployment)
- [Serving Apps with Client-Side Routing](#serving-apps-with-client-side-routing)
- [Building for Relative Paths](#building-for-relative-paths)
Expand Down Expand Up @@ -1206,6 +1207,37 @@ Learn more about React Storybook:

You can turn your React app into a [Progressive Web App](https://developers.google.com/web/progressive-web-apps/) by following the steps in [this repository](https://github.com/jeffposnick/create-react-pwa).

## Analyzing the Bundle Size

[Source map explorer](https://www.npmjs.com/package/source-map-explorer) analyzes
JavaScript bundles using the source maps. This helps you understand where code
bloat is coming from.

To add Source map explorer to a Create React App project, follow these steps:

```
npm install source-map-explorer --save-dev
```

Then in `package.json`, add the following line to `scripts`
On Windows you will have to type the full file path out.

```diff
"scripts": {
"start": "react-scripts start",
"build": "react-scripts build",
"test": "react-scripts test --env=jsdom",
+ "analyze": "source-map-explorer build/static/js/main.* "
```
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Please explain what to do next.

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I tested it, and it helped me. It opens a window in your browser, with this kind of screenshot:
image


Then to analyze the bundle run the production build then run the analyze
script.

```
npm run build
npm run analyze
```

## Deployment

`npm run build` creates a `build` directory with a production build of your app. Set up your favourite HTTP server so that a visitor to your site is served `index.html`, and requests to static paths like `/static/js/main.<hash>.js` are served with the contents of the `/static/js/main.<hash>.js` file. For example, Python contains a built-in HTTP server that can serve static files:
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