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@@ -147,21 +153,30 @@ Prevent downgrade attacks with [HTTP strict transport security](https://develope
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###Environment variables
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[`REACT_APP_*`](https://github.com/facebookincubator/create-react-app/blob/v0.2.3/template/README.md#adding-custom-environment-variables) environment variable are supported with this buildpack.
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[`REACT_APP_*` environment variables](https://github.com/facebookincubator/create-react-app/blob/v0.2.3/template/README.md#adding-custom-environment-variables) are supported with this buildpack.
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🤐*Be careful not to export secrets. These values may be accessed by anyone who can see the React app.*
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Set[env vars onaHeroku app](https://devcenter.heroku.com/articles/config-vars) like this:
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#####[Set vars on Heroku](https://devcenter.heroku.com/articles/config-vars)
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```bash
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heroku config:set REACT_APP_HELLO='I love sushi!'
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```
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For local development, use[dotenv](https://www.npmjs.com/package/dotenv) to load variables from a`.env` file.*Requires at least create-react-app 0.7.*
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#####Set vars for local dev
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*Requires at least create-react-app 0.7. Earlier versions only support Compile-time.*
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Create a`.env` file that sets a variable per line:
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```bash
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REACT_APP_API_URL=http://api.example.com
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REACT_APP_CLIENT_ID=XyzxYzxyZ
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```
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####Compile-time vs Runtime
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Two versions of variables are supported. In addition to compile-time variables applied during[build](https://github.com/facebookincubator/create-react-app#npm-run-build), this buildpack supports runtime configuration aswell.
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Two versions of variables are supported. In addition to compile-time variables applied during[build](https://github.com/facebookincubator/create-react-app#npm-run-build) the app supportsvariables set atruntime, applied aseach web dyno starts-up.