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The old version of prettier we were using didn't support the Flow syntax to access properties in a type using `SomeType['prop']`. This updates `prettier` and `rollup-plugin-prettier` to the latest versions. I added the prettier config `arrowParens: "avoid"` to reduce the diff size as the default has changed in Prettier 2.0. The largest amount of changes comes from function expressions now having a space. This doesn't have an option to preserve the old behavior, so we have to update this.
Harness for testing local changes to the react-devtools-inline and react-devtools-shared packages.
Development
This target should be run in parallel with the react-devtools-inline package. The first step then is to run that target following the instructions in the react-devtools-inline README's local development section.
The test harness can then be run as follows:
cd packages/react-devtools-shell
yarn start
Once you set both up, you can view the test harness with inlined devtools in browser at http://localhost:8080/