In the `create-react-app` command, try to install packages using Yarn.
If Yarn is not installed, use npm instead.

In `react-scripts`, detect if the project is using Yarn by checking if
a `yarn.lock` file exists. If the project is using Yarn, display all
the instructions with Yarn commands and use Yarn to install packages
in `init` and `eject` scripts.

issue here #762

* Add syntax error overlay in development

* Support HMR being disabled

* Tweak CSS

* Extract some utilities into a separate package

* Add utils dir to `files` in package.json

* Do not create an empty `utils` dir on eject

* Add host as adjustable parameter through env variables

eg: `HOST=test.dev.local npm start`

* Style nit

* Load environment file via dotenv if .env file is present

* Document loading environment variables in .env file

* Minor doc tweaks

* openBrowser() causes docker-compose set ups to fail because of spawn EACCESS - closes #710



Signed-off-by: Aeneas Rekkas (arekkas) <aeneas@ory.am>

* Ignore errors

* Change http-proxy-middleware logLevel from silent to error

* provide onError handler for httpProxyMiddleware

* Send proper error reponse upon proxy error.

* Change http-proxy-middleware logLevel from silent to error

* provide onError handler for httpProxyMiddleware

With the HTTPS env var set 'true', the dev server will serve over HTTPS.

* Disable contentBase in development

* Document #428

tagging dev-only code (@remove-on-publish-begin/end) and pre-eject-only code (@remove-on-eject-begin/end) #257 (#257)

Ref #387

Thanks to @geowarin for the tip in https://github.com/facebookincubator/create-react-app/issues/401#issuecomment-238291901

* Small grammatical correction

* Fix another grammatical error for consistency

This allows users to avoid CORS in simple projects that are hosted on the same server as backend.

Ref: https://twitter.com/sprjrx/status/760481328886272004

Fixes #322

The problem has since been fixed upstream.

This reverts commit f7011e04.

This fixes #302 by temporarily forking `detect-port`.
Hopefully this fix will be merged into the original project, and we can refer to it again.

This seems to work best, both on Windows, OS X, and Linux

Also fixes #194