feat!: remove @vitest/coverage-c8 package

[AriPerkkio]

• Continues feat!: add @vitest/coverage-v8 package #3339
• Removes @vitest/coverage-c8 package
• Removes all mentions of c8 from documentation
• Throw informative error when coverage.provider: 'c8' is used

BREAKING CHANGES:

• coverage.provider: 'c8' is no longer supported. Use coverage.provider: 'v8' instead. See feat!: add @vitest/coverage-v8 package #3339.

Actions after release

• Deprecate @vitest/coverage-c8 NPM package: https://docs.npmjs.com/cli/v8/commands/npm-deprecate

[AriPerkkio]

This guide still mentions c8 through coverage ignore hints. That is correct syntax.

vitest/docs/guide/coverage.md

Lines 160 to 164 in 1e8760a

	For `v8` this does not cause any issues. You can use `c8 ignore` comments with Typescript as usual:
	<!-- eslint-skip -->
	```ts
	/* c8 ignore next 3 */

I've opened a feature request to changes this: istanbuljs/v8-to-istanbul#215

[AriPerkkio]

After this one is merged and released, should we add deprecation warning to @vitest/coverage-c8@0.32.x NPM package? https://docs.npmjs.com/cli/v8/commands/npm-deprecate

[sheremet-va]

After this one is merged and released, should we add deprecation warning to @vitest/coverage-c8@0.32.x NPM package? docs.npmjs.com/cli/v8/commands/npm-deprecate

Yes. You can add a section in the description for what to do here after we released the new major. We should also probably add a filter for c8 package to stop releasing new versions (we run with pnpm release which is a script in package.json)

[AriPerkkio]

We should also probably add a filter for c8 package to stop releasing new versions

I guess it's fine to keep releasing new patch versions of 0.32.x of this package alongside other monorepo packages. In next major the whole package will be removed so no filters needed.

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[sheremet-va]

Can you resolve conflicts with the lockfile?

[AriPerkkio]

Rebased main and resolved lockfiles. Good to go. 🚀