agama-project / agama / 20099656638

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Use the "fork-ts-checker-webpack-plugin" for parallel type checks (#2930)

## Problem

- The TypeScript type checks are disabled in development builds, they
run only in the production build
- The reason is probably the slowdown caused by the checks
  - Development build with type checks off (the default): ~10 seconds
- Development build with type checks on (explicitly enabled in the
config): ~15 seconds
  - So enabling the type checks increases the build time +50% :worried: 

## Solution

- Use the
[fork-ts-checker-webpack-plugin](https://github.com/TypeStrong/fork-ts-checker-webpack-plugin)
which runs the type checks in parallel in a separate process so the main
webpack build is not affected and runs with the disabled checks.

## Testing

- Tested manually
- With the type checks enabled the development build takes about 10
seconds, the same time as originally with type checks off. :+1: So there
should be no slowdown even with enabled checks.
- It helps to speed up the production builds as well:
  - Original production build: ~20 seconds
  - Production build with parallel type checks: ~15 seconds
  - So the production build is about 25% faster! :smiley:

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