index.js: The main Node.js script. It fetches PR files, evaluates their risk level, calculates business impact, and uses GitHub APIs to add appropriate size/* and domain/* labels.
samples.json: A collection of historical PRs used as test cases to verify the labeling logic (especially for regression testing the S/M/L thresholds).

Features

Size Labels (`size/*`)

The script evaluates the "effective" lines of code changed (ignoring tests, docs, and ci files) to classify the PR:

size/S: Low-risk changes involving only docs, tests, CI workflows, or chores.
size/M: Small-to-medium changes affecting a single business domain, with effective lines under 300.
size/L: Large features (>= 300 lines), cross-domain changes, or any changes touching core architecture paths (like cmd/).
size/XL: Architectural overhauls, extremely large PRs (>1200 lines), or sensitive refactors.

Domain Tags (`domain/*`)

The script also identifies which business domains a PR touches to give reviewers an immediate sense of the impact scope. Currently tracked domains include:

domain/im
domain/vc
domain/ccm
domain/base
domain/mail
domain/calendar
domain/task
domain/contact

Minor modules like docs and tests are omitted to keep PR tags clean and focused on structural changes.

Usage

In GitHub Actions

This script is designed to run in CI workflows. It automatically reads the GITHUB_EVENT_PATH payload to get the PR context.

node scripts/pr-labels/index.js

Local Dry Run

You can test the labeling logic against an existing GitHub PR without actually applying labels by using the --dry-run flag.

# Requires GITHUB_TOKEN environment variable or passing --token
node scripts/pr-labels/index.js --dry-run --repo larksuite/cli --pr-number 123

Testing

A regression test suite is available in test.js which verifies the output of the classification logic against historical PRs configured in samples.json.

# Requires GITHUB_TOKEN environment variable to avoid rate limits
GITHUB_TOKEN=$(gh auth token) node scripts/pr-labels/test.js

This test suite also runs automatically in CI via .github/workflows/pr-labels-test.yml when changes are made to this directory.

README.md

PR Label Sync

Files