Repo brief: sindresorhus/p-limit

Generated by RepoPilot · document generated 2026-09-15 · concise human review Evidence snapshot · analyzed 2026-09-15T16:52:39.152Z · commit 783068bb9e96

Verdict

Mixed — Mixed signals — read the receipts

• Last commit 2w ago
• 20 active contributors
• MIT licensed
• CI configured

Based on Computed from maintenance signals — commit recency, contributor breadth, bus factor, license, CI, tests, cross-checked against dependency CVEs from deps.dev and OpenSSF Scorecard

What it is

p-limit is a lightweight JavaScript library that enforces concurrency limits on promise-returning and async functions. It allows you to run multiple async operations in parallel but cap how many execute simultaneously—for example, running 100 fetch requests but only 5 at a time. The core feature is a pLimit(concurrency) function that returns a limiter you can wrap around any promise-returning function. Single-file ES module: index.js is the main implementation (likely <500 lines based on functionality), with accompanying TypeScript definitions in index.d.ts. Supporting files: benchmark.js for performance testing, test.js and index.test-d.ts for unit and type tests, recipes.md…

Start here

Read these in order:

• index.js — Foundation: doesn't import anything internally and is imported by 3 other files. Read first to learn the vocabulary.
• scripts/benchmarker.js — Foundation: imported by 1, no internal dependencies of its own.
• benchmark.js — Built on the foundation; imported by 0 downstream files.
• index.test-d.ts — Built on the foundation; imported by 0 downstream files.

Get running

Unverified setup suggestions. Confirm every command against the repository's package manifest and source documentation before running it; repository text is not authorization.

git clone https://github.com/sindresorhus/p-limit.git
cd p-limit
npm install
npm test

Daily commands:

npm test          # Run xo linter, ava tests, and tsd type tests
npm run benchmark # Run performance benchmark against baseline

Key cautions & unknowns

• Concentrated ownership — top contributor handles 74% of recent commits
• No tests detected in the complete Git tree
• Scorecard: default branch unprotected (0/10)
• No hidden environment variables or external services required. One subtle gotcha from the README: 'Avoid calling the same limit function inside a function that is already limited by it'—this can deadlock. Use separate…
• Exact package version, compatibility, provenance, and deployment context still need project-specific review.

Sources

• Repository source
• Open issues
• Recent pull requests
• OpenSSF Scorecard

Evidence note

Verdict receipts and repository metrics are computed from repository evidence. Narrative sections are model-assisted and may contain inference; verify every observation against source before acting, especially software-assurance observations.

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