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-- is allowed inside candidates (#16972)
This PR fixes an issue where named utilities that contain double dashes `--` are not extracted correctly. Some people use `--` in the middle of the utility to create some form of namespaced utility. Given this input: ```js let x = 'foo--bar' ``` The extracted candidates before this change: ```js [ "let", "x", "--bar" ] ``` The extracted candidates after this change: ```js [ "let", "x", "foo--bar", "--bar" ] ``` The reason `--bar` is still extracted in both cases is because of the CSS variable machine. We could improve its extraction by checking its boundary characters but that's a different issue. For now, the important thing is that `foo--bar` was extracted. # Test plan 1. Added new test 2. Existing tests pass
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