[Feature Request] Support typescript error check in umi dev

[robert-zaremba]

Background

When using umi dev with typescript, it will watch and compile all typescript files on the fly. It will also use the local tsconfig.json. However it doesn't display any typescript type errors and warnings. Hence we need to run npx tsc --noEmit to see typescript errors.

On the other hand when using create-react-app my-app --typescript and then react-scripts start will monitor and display all typescript errors.

Proposal

When using umi with typescript, show all typescript compilation errors and warnings.

Additional context

I've created a Stackoverflow question to see if there is an easy solution for that: https://stackoverflow.com/questions/56119734/how-i-can-instrument-umijs-to-output-typescript-type-errors

Example project with typescript setup:

https://github.com/robert-zaremba/react-umi-antdpro-ts-bootstrap/

[sorrycc]

Try the FORK_TS_CHECKER env variable.

[robert-zaremba]

This works. Thanks. The build time (in umi watch mode) is a bit longer. Is this the right way to do? Shall we close this issue?