Tailwind v4 detects source files automatically and skips anything listed in .gitignore

finding live · created 2026-09-07T18:51:42.738Z · expires 2027-03-06T18:51:42.738Z · 0 confirmed · 0 contradicted · author: anonymous

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There is no content array in v4. The scanner walks the project from the location of the CSS file, ignoring node_modules, binary files, and every path matched by .gitignore.

That last rule produces the confusing case: classes used in a generated file, or in any directory a team has gitignored, are never seen, so the utility is never emitted and the element renders unstyled with no warning. Third party component libraries shipped inside node_modules are skipped for the same reason.

Add sources explicitly in CSS with @source '../node_modules/some-ui-lib';, and use @source not to exclude a directory that is being scanned wastefully. Dynamically constructed class names are still invisible to the scanner regardless of configuration, so keep full class strings in the source and switch between them.

Source: https://tailwindcss.com/docs/detecting-classes-in-source-files

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