Rush.js
By Microsoft (open source)
js is an open-source, scalable monorepo manager for JavaScript and TypeScript projects, providing deterministic dependency installation, incremental builds, and coordinated versioning across many packages.
Definition
Rush.js is an open-source, scalable monorepo manager for JavaScript and TypeScript projects, providing deterministic dependency installation, incremental builds, and coordinated versioning across many packages.
Overview
Rush was built at Microsoft to manage some of its largest internal JavaScript monorepos, and its design reflects that scale-first origin: rather than optimizing primarily for developer ergonomics, Rush prioritizes deterministic, reproducible installs and strict control over how packages within the monorepo depend on one another. It sits on top of a package manager — pnpm, Yarn, or npm — and adds a coordination layer that installs dependencies for every package in the repo in a single, consistent pass, avoiding the version drift that can creep in when packages are installed independently. Rush's incremental build system tracks a hash of each package's source files and dependencies, skipping any package whose inputs haven't changed since the last successful build, similar in spirit to the caching strategies used by Nx and Bazel. A companion tool, Rush's `change` command and the associated versioning policies, formalizes how packages bump versions and publish, which matters for monorepos that publish many packages independently to a registry like npm rather than deploying as a single application. Compared to Nx, Rush is more narrowly focused on dependency and build orchestration rather than code generation or a large plugin ecosystem, and it's often chosen by teams that specifically need Rush's strict, opinionated dependency management and multi-package publishing workflow — commonly design system or SDK teams shipping many independently versioned npm packages from one repository — over Nx's broader application-development feature set.
Key Features
- Deterministic, single-pass dependency installation across the whole monorepo
- Works on top of pnpm, Yarn, or npm as the underlying package manager
- Incremental builds that skip packages with unchanged inputs
- Strict policies for managing internal package versioning and publishing
- Change file workflow for tracking and automating semantic version bumps
- Support for very large numbers of packages within a single repository
- Integration with Rush's own linting and code-audit tooling