run.mjs builds files from a Node.js checkout's test/parallel with scriptc, runs each executable in that directory, and compares its exit status with Node's. It records a verdict per file: pass (the same exit code, or the same terminating signal), fail (a different exit code or signal), or refused (the build failed), with the first error line.

git clone --depth 1 --branch v24.22.0 https://github.com/nodejs/node /path/to/node
node tests/node-parallel/run.mjs --node /path/to/node --pattern '^test-(url-|whatwg-url-|querystring)'

Options:

--node: a Node.js checkout, or its test directory. Use the version in .node-version.
--pattern: a regular expression over file names in test/parallel.
--common: minimal (the default) or node.
- minimal copies the selected files into <out>/tree/test/parallel and uses common/index.cjs, common/wpt.cjs and common/tmpdir.cjs from this directory as test/common/index.js, test/common/wpt.js and test/common/tmpdir.js, with the checkout's test/fixtures, test/common/fixtures.js, test/common/dns.js and test/common/internet.js. The minimal common has the helpers these files use (mustCall, mustNotCall, mustSucceed, skip, expectWarning, expectsError, invalidArgTypeHelper, spawnPromisified, hasIntl, isWindows, PIPE, ...) with Node's semantics, so a verdict measures the module under test rather than Node's full test/common.
- node builds the files in place against Node's own test/common.
--out: where executables and results go (default node_modules/.cache/scriptc-node-parallel).
--cli: the scriptc CLI entry (default packages/cli/dist/main.js).
--jobs: concurrent files (default 4).

Node runs each file with its // Flags: line. Results are written to <out>/results.json and <out>/results.md.

Before a lane relies on the minimal common, run its files under Node in <out>/tree/test/parallel: they should all pass there.