Replace run-parallel-limit with p-limit

[Copilot]

Replaces the callback-based run-parallel-limit with the promise-based p-limit v7.3.0 (latest). Despite being ESM-only, it works because Node 22+ supports require() of synchronous ESM modules.

Changes

• cleanTask.ts — Converted to async; fse.remove() already returns a promise, so callbacks are no longer needed
• copyTask.ts — Converted to async; stream operations wrapped in promises with proper writeStream.on('finish') (previously used readStream.on('end') which could resolve before the write completes)
• sassTask.ts — sass.render callbacks wrapped in promises; added missing .catch(reject) on the postcss promise chain
• package.json — Added p-limit@^7.3.0, removed run-parallel-limit and @types/run-parallel-limit

Before/After

// Before (callback-based)
import parallelLimit = require('run-parallel-limit');
return function clean(done: (err: Error | null) => void) {
  const tasks = paths.map(p => (cb) => fse.remove(p, cb));
  parallelLimit(tasks, limit, done);
};

// After (promise-based)
import pLimit from 'p-limit';
return async function clean() {
  const limiter = pLimit(limit);
  await Promise.all(paths.map(p => limiter(() => fse.remove(p))));
};

Public API surface is unchanged per api-extractor.

Warning

Firewall rules blocked me from connecting to one or more addresses (expand for details)

I tried to connect to the following addresses, but was blocked by firewall rules:

• ofcncog2cu-dsn.algolia.net
  • Triggering command: /opt/hostedtoolcache/node/24.14.0/x64/bin/node /opt/hostedtoolcache/node/24.14.0/x64/bin/node /home/REDACTED/work/just/just/.yarn/releases/yarn-4.13.0.cjs add p-limit@latest (dns block)

If you need me to access, download, or install something from one of these locations, you can either:

• Configure Actions setup steps to set up my environment, which run before the firewall is enabled
• Add the appropriate URLs or hosts to the custom allowlist in this repository's Copilot coding agent settings (admins only)

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💡 You can make Copilot smarter by setting up custom instructions, customizing its development environment and configuring Model Context Protocol (MCP) servers. Learn more Copilot coding agent tips in the docs.