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* Update to jest 24
* Add notice about pnpResolver.js
* Formatting
* Fix linting
* Update to jest 24.1.0
* Update jest-pnp-resolver
* Swap create-react-app params in e2e scripts
* Add extraGlobals to supportedKeys
* Bump jest to 24.3.1
* Bump jest to 24.4.0
* Bumb jest to 24.5.0
* Update template dependencies jest to 24.5.0
* Debug failing test
* Remove jest-pnp-resolver
* Remove console.log
* Revert yarn.lock.cached
* Revert "Revert "Speed up TypeScript projects (#5903)""
This reverts commit 544a5943ce.
* Move fork-ts-checker dep to react-dev-utils
* Convert WebpackDevServerUtils.createCompiler to take in options arg
* Update README.md for react-dev-utils
As a lot of [people](https://hackernoon.com/why-i-no-longer-use-typescript-with-react-and-why-you-shouldnt-either-e744d27452b4) is complaining about TypeScript performance in CRA, I decided to enable `async` mode in TypeScript checker.
These changes basically brings the JS compilation times to TS projects. So, recompilation took less than 1 second instead of 3 seconds in medium size project.
The problem with async mode is that type-errors are reported after Webpack ends up recompilation as TypeScript could be slower than Babel. PR allows to emit files compiled by Babel immediately and then wait for TS and show type errors in terminal later. Also, if there was no compilation errors and any type error occurs, we trigger a hot-reload with new errors to show error overlay in browser.
Also, I wanted to start a discussion about `skipLibCheck: false` option in default `tsconfig.json`. This makes recompilations really slow and we should consider to set it to `true` or at least give users a big warning to let them know that it could be really slow.
The following video is showing the updated workflow with a forced 2.5 second delay for type-check to give you an idea how it works.
I'm pretty sure that PR needs some polishing and improvements but it should works as it is. Especially a "hack" with reloading the browser after type-check looks ugly to me.
cc @brunolemos as he is an initiator of an original TypeScript PR.
Should fix https://github.com/facebook/create-react-app/issues/5820
* Don't resolve TS files if it's not detected in the project
* Automatically create tsconfig.json file for user
* Remove always false check
* Add missing file
* Don't filter paths too early
