codemirror
@codemirror/lang-css 
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This package implements CSS language support for the CodeMirror code editor.
The project page has more information, a number of examples and the documentation.
This code is released under an MIT license.
We aim to be an inclusive, welcoming community. To make that explicit, we have a code of conduct that applies to communication around the project.
API Reference
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css() → LanguageSupport Language support for CSS.
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cssLanguage: LRLanguage A language provider based on the Lezer CSS parser, extended with highlighting and indentation information.
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cssCompletionSource: CompletionSource CSS property, variable, and value keyword completion source.
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defineCSSCompletionSource(isVariable: fn(node: SyntaxNodeRef) → boolean) → CompletionSource Create a completion source for a CSS dialect, providing a predicate for determining what kind of syntax node can act as a completable variable. This is used by language modes like Sass and Less to reuse this package's completion logic.