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May 9, 2017
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docs: add dev vs prod details #6232

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24 changes: 21 additions & 3 deletions docs/documentation/build.md
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Expand Up @@ -59,10 +59,28 @@ ng build --base-href /myUrl/
ng build --bh /myUrl/
```

### Bundling
### Bundling & Tree-Shaking

All builds make use of bundling, and using the `--prod` flag in `ng build --prod`
or `ng serve --prod` will also make use of uglifying and tree-shaking functionality.
All builds make use of bundling and limited tree-shaking, while `--prod` builds also run limited
dead code elimination via UglifyJS.

### `--dev` vs `--prod` builds

Both `--dev`/`--target=development` and `--prod`/`--target=production` are 'meta' flags, that set other flags.
If you do not specify either you will get the `--dev` defaults.

Flag | `--dev` | `--prod`
--- | --- | ---
`--aot` | `false` | `true`
`--environment` | `dev` | `prod`
`--output-hashing` | `media` | `all`
`--sourcemaps` | `true` | `false`
`--extract-css` | `false` | `true`

`--prod` also sets the following non-flaggable settings:
- Adds service worker if configured in `.angular-cli.json`.
- Replaces `process.env.NODE_ENV` in modules with the `production` value (this is needed for some libraries, like react).
- Runs UglifyJS on the code.

## Options
<details>
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