docs(module): document module.parser.css.pure (strict pure mode)#8245
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Webpack 5.107 adds a new pure parser option for css/module and css/auto that mirrors postcss-modules-local-by-default's pure mode. Every selector must contain at least one local class or id, otherwise the build fails. Documents the option, plus the two opt-out comments (/* cssmodules-pure-ignore */ per-rule and /* cssmodules-pure-no-check */ per-file) and the constructs that are exempt by design. Refs: webpack/webpack#20946
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alexander-akait
approved these changes
May 18, 2026
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Summary
Webpack 5.107 adds a new
pureparser option forcss/moduleandcss/autothat mirrors postcss-modules-local-by-default's pure mode. Every selector must contain at least one local class or id; otherwise the build fails.Documents the option, plus the two opt-out comments:
/* cssmodules-pure-ignore */(per-rule)/* cssmodules-pure-no-check */(per-file)…and the constructs that are exempt by design (nested rules under local-bearing ancestors,
&,@keyframes,@counter-style). Added inconfiguration/module.mdxnext tomodule.parser.css.namedExports.Refs: webpack/webpack#20946
Test plan
Use of AI
Drafted with Claude under human review. The contributor verified each change against the upstream webpack PR before commit.