pro-xslt

pro-xslt is a browser-oriented XSLT processor implemented in plain JavaScript.

It provides a growing subset of XSLT 1.0 features including template matching, xsl:value-of, conditionals, loops/sorting, attribute sets, includes/imports, keys, and formatting helpers.

Requirements

• Node.js 18+ (development and tooling)

Install

npm install

Development

| Command | Description | | --- | --- | | npm run build | Build minified ESM and UMD bundles into dist/ | | npm run build:watch | Rebuild bundles when source changes | | npm test | Run the full Vitest suite once | | npm run test:watch | Run Vitest in watch mode | | npm run bench | Run transform performance benchmark cases | | npm run bench:compare -- <baseline.txt> <candidate.txt> | Compare two saved benchmark outputs |

Benchmarking

Use npm run bench to measure transform throughput on two representative workloads:

• apply-templates-heavy
• key-heavy-50kb

For commit-to-commit comparison:

1. Run baseline and save output: npm run bench > baseline.txt
2. Switch to candidate commit and save output: npm run bench > candidate.txt
3. Compare automatically: npm run bench:compare -- baseline.txt candidate.txt

Usage

Global (UMD)

Use dist/pro-xslt.umd.js in the browser. The library is exposed as global ProXslt.

ESM

Import from dist/pro-xslt.esm.js or package entry exports.

Project structure

• src/ — source code
• dist/ — generated bundles
• demo/ — browser demo page
• tests/ — Vitest test suite and fixtures
• .github/workflows/ — CI/CD, releases, and deployment automation

Contributing

See CONTRIBUTING.md for contribution guidelines and development workflow.

License

GPL-3.0-only