Fork ubroken module

[vmoroz]

Description

Type of Change

• Bug fix (non-breaking change which fixes an issue)

Why

The CI linting pipeline uses the external unbroken npm package (v1.0.27) to
check for broken links in markdown files. The package is no longer actively
maintained, and it fails on transient HTTP errors (e.g. 502) without retrying,
causing spurious CI failures when GitHub is temporarily flaky. It also pulls in
several external dependencies (axios, chalk, command-line-args, command-line-usage,
micromatch) that increase the supply chain risk surface.

What

Forked the unbroken package into the monorepo as @rnw-scripts/unbroken,
following the same conventions as other @rnw-scripts packages
(e.g. prepare-release).

Key changes from the original:

• Retry transient HTTP errors: HTTP 502, 503, and 504 responses now trigger
  retries with exponential backoff (up to 5 attempts), instead of failing
  immediately. Previously only HTTP 429 (rate limiting) was retried.
• Replaced axios with Node.js built-in fetch: Removes the external HTTP
  client dependency entirely. The fetch API is available globally since
  Node 18, and the package targets Node >= 22.
• Replaced command-line-args/command-line-usage with parseArgs from
  node:util: Uses the Node.js built-in CLI argument parser, matching the
  pattern established in @rnw-scripts/prepare-release.
• Replaced micromatch with path.matchesGlob(): Uses the Node.js 22.5+
  built-in glob matcher for exclusion pattern matching.
• Replaced chalk with ANSI escape codes: Simple helper functions
  (yellowBold, redBold) for colored output, no external dependency needed.
• Replaced source-map-support with process.setSourceMapsEnabled(true):
  Uses the Node.js built-in source map support.
• Replaced fs with @react-native-windows/fs: Follows the repo convention
  enforced by ESLint.
• Fixed broken links in docs/react-native-windows-init.md: Updated
  http:// mustache links to https://.

The result is a package with zero external runtime dependencies (only
@react-native-windows/fs from the monorepo).

Original copyright and license (MIT, Alexander Sklar) are preserved in both
the LICENSE file and source file headers. The original project URL
(https://github.com/asklar/unbroken) is referenced in the help output.

The root package.json now depends on @rnw-scripts/unbroken instead of
unbroken. No pipeline YAML changes are needed since the binary name
(unbroken) is preserved via the package's bin field.

Screenshots

N/A

Testing

• Ran npx unbroken -q --local-only --allow-local-line-sections successfully
  (0 errors, 1 warning — same as before).
• Ran npx unbroken --help to verify CLI argument parsing works correctly.
• Ran yarn build and rnw-scripts lint:fix on the new package with no errors.

Changelog

Should this change be included in the release notes: no

Microsoft Reviewers: Open in CodeFlow

[iamAbhi-916]

LGTM