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Add instructions for setting buildpack on an existing heroku app #174

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Add instructions for setting buildpack on an existing heroku app #174

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8 changes: 8 additions & 0 deletions README.md
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Expand Up @@ -146,6 +146,14 @@ Use [create-react-app's built-in Jest testing](https://github.com/facebookincuba

[Heroku CI](https://devcenter.heroku.com/articles/heroku-ci) is supported with minimal configuration. The CI integration is compatible with npm & yarn (see [`bin/test`](bin/test)).

#### Add to existing Heroku app

If you have your react app deployed to heroku already and wish to use this buildpack, you can do so by running:

```
heroku buildpacks:set mars/create-react-app
```

#### Minimal `app.json`

Heroku CI uses [`app.json`](https://devcenter.heroku.com/articles/app-json-schema) to provision test apps. To support Heroku CI, commit this minimal example `app.json`:
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