CleanerCSS - Safe, conservative unused CSS remover

CleanerCSS helps you safely detect and remove unused selectors from CSS and SCSS files without breaking your app. It uses workspace-wide usage scanning, conservative heuristics for frameworks and dynamic classes, and always shows a native VS Code diff preview before writing changes.

Key points:

• Conservative by design: uncertain or dynamic selectors are preserved by default.
• Native VS Code diff preview and WorkspaceEdit application - you always review before changes.
• Local snapshots and history for safe rollback.
• Configurable safelists, framework hints and scanning options.

Visual Editor & Revert your changes

Quick start

1. Open any .css or .scss file in your workspace.
2. Run the command CleanerCSS: Clean Current File from the Command Palette.
3. Review the native VS Code diff. Apply to write changes (a snapshot is taken automatically) or export a patch.

Features

• Workspace scanning for selector usage (includes JS/TS/HTML and simple template strings).
• Conservative SCSS support via postcss-scss with safeguards for complex constructs.
• Branch-level selector analysis (handles comma-separated lists safely).
• Safelists and regex patterns to protect dynamic classes (e.g. ^js-, ^is-, ^has-).
• Activity Bar view: CleanerCSS History with snapshots and restore.
• MCP (Model Context Protocol) server tools for automated analysis in CI or agent workflows.

Commands

• cleanerCSS.cleanCurrentFile - Clean the active CSS/SCSS file (opens diff preview).
• cleanerCSS.analyzeCurrentFile - Run analysis and show results (Problems, report, or ask).
• cleanerCSS.cleanWorkspace - Run cleanup across the workspace (reviewable patches).
• cleanerCSS.openHistory - Open local history of CleanerCSS snapshots.
• cleanerCSS.restoreFromHistory - Restore a saved snapshot.
• cleanerCSS.openSettings - Open CleanerCSS settings.

Configuration highlights

Configure behaviour under the cleanerCSS.* settings. Important ones:

• cleanerCSS.safelist / cleanerCSS.safelistPatterns - never-remove selectors.
• cleanerCSS.enableScssSupport - enable conservative SCSS parsing.
• cleanerCSS.minConfidenceToRemove - confidence threshold before proposing removals.
• cleanerCSS.analysisOutput - where analysis results appear (problems, markdownReport, ask).

See package.json for the full configuration schema.

Privacy and safety

CleanerCSS runs locally. It does not send your code to external servers, does not collect telemetry, and always creates local snapshots before applying any change.

Development

Install, compile and run tests:

npm install
npm run compile
npm test

Package the extension:

npm run package

License

MIT - see the LICENSE file.