Add first class Javascript/Typescript support to the Mill build tool

[monyedavid]

This pr implements the examples for jslib/dependencies.

#3927

Checklist:

• example/jslib/linting
  • 1-linting
  • 2-autoformatting
  • 3-code-coverage

Key changes:

• Add coverage for Jest, Jasmine, Mocha and Vitest.
• Add lint and auto format support with prettier and eslint.
• Generate test config for Jest & Vite, with option to use a custom test config.

[lihaoyi]

The docs for Linting and AutoFormatting with Eslint and Prettier appears to be duplicated twice

Linting Typescript Projects __ The Mill JVM Build Tool.pdf

[lihaoyi]

Is there a reason example/javascriptlib/testing/1-test-suite/vite.config.ts and all the other files was deleted?

[monyedavid]

Is there a reason example/javascriptlib/testing/1-test-suite/vite.config.ts and all the other files was deleted?

yes, mill generates by default those files... but you can opt to use yours. I will update the testing docs.

[monyedavid]

The docs for Linting and AutoFormatting with Eslint and Prettier appears to be duplicated twice

Linting Typescript Projects __ The Mill JVM Build Tool.pdf

will clean out the auto-format docs

[monyedavid]

@lihaoyi this is still pending completion.