refactor: remove duplicate values from coverage.exclude

[btea]

Description

When vitest --coverage is executed, resolveConfig will be executed twice.

Resolves #issue-number

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[sheremet-va]

When vitest --coverage is executed, resolveConfig will be executed twice.

What do you mean? It is called once.

[btea]

As shown in the image below, I set a breakpoint when setting the value of coverage.exclude. The first time, resolved.coverage.exclude was an empty array, and then the default value was set. The second time, since the value had already been set, the same value was set again.

screenshot

[sheremet-va]

As shown in the image below, I set a breakpoint when setting the value of coverage.exclude. The first time, resolved.coverage.exclude was an empty array, and then the default value was set. The second time, since the value had already been set, the same value was set again.

screenshot

How does your config look like?

[btea]

element-plus/element-plus#23223

[sheremet-va]

This seems more like a bug with projects resolution, the coverage.exclude is not the only affected array. Do you really need a projects field? Can't you just put a unit in the root's test.name?

[btea]

yeah, you are right, it appears that after removing the projects configuration, resolveConfig will only execute once.

By the way, I saw in the documentation that coverage.exclude defaults to an empty array, but the actual code has a default value configured. Perhaps the documentation should be updated accordingly.

[sheremet-va]

By the way, I saw in the documentation that coverage.exclude defaults to an empty array, but the actual code has a default value configured. Perhaps the documentation should be updated accordingly.

Technically speaking, the default is empty. Custom excludes don't override "the default". This is just an internal implementation detail of how the coverage providers treat certain files (like unreadable virtual files), it could've been hardcoded inside the provider, for example, but it should probably be mentioned in the docs in some way.

[btea]

but it should probably be mentioned in the docs in some way.

I have updated the documentation.

By default, resolved.config is usually included in configFiles, but its result is an absolute path. Should this be treated as an identical value and removed?

vitest/packages/vitest/src/node/config/resolveConfig.ts

Lines 413 to 414 in 1500654

	resolved.config && slash(resolved.config),
	...configFiles,