Node modules are automatically mocked when you have a manual mock in place (e.g.: _mocks_/lodash.js). All modules used in your tests will have a replacement implementation, keeping the API surface. Lerna is a safe start, switch to Rush when build time getting out of hand, or a complete build system when monorepo is not pure JavaScript anymore.This option tells Jest that all imported modules in your tests should be mocked automatically. Nx and Rush are way more complicated, optimized for JavaScript Tooling, close to a build system in terms of features and learning curve.Ībove tools makes life easier for JavaScript developers who build and publish many npm packages at once. react-router - declarative routing for React.create-react-app - create React apps with no build configuration.babel - compiler for writing next generation JavaScript.Following are notable public lerna-based monorepos: Lerna is fast to get started with very little configuration, good at running scripts in packages, can be used together with package managers’ workspaces to improve bootstrap performance. Package managers’ workspaces is good at optimizing node_modules installation and nothing else, you need dedicated tools to actually orchestrate a monorepo. With Nx, you get a consistent dev experience regardless of the tools used. It has support for TypeScript, React, Angular, Cypress, Jest, Prettier, Nest.js, Next.js, Storybook, Ionic among others. Nx is an open platform with plugins for many modern tools and frameworks. ![]() ![]() If someone has already built or tested similar code, Nx will use their results to speed up the command for everyone else instead of rebuilding or retesting the code from scratch. Nx has support for distributed and incremental builds. Nx is smart when it analyzes your workspace and figures out what can be affected by every code change and only rebuilds what is necessary. Nx is a set of extensible dev tools for monorepo, has first-class support for many frontend and backend technologies like Angular, React, and Node. If you define custom commands or options, they are strictly validated and documented as part of Rush’s command-line help. Rush helps to ensure that installs and builds are completely deterministic. Rush’s isolated symlinking model eliminates npm phantom dependencies, ensuring you’ll never again accidentally import a library that was missing from package.json. Different subsets of projects can publish separately with lockstep or independent versioning strategies, private releases, and so forth. Rush can enforce consistent dependency versions across your repo. Repo policies allow new package dependencies to be reviewed before they are accepted. Rush supports parallel builds, subset builds, and incremental builds. Rush’s unique installation strategy produces a single shrinkwrap/lock file for all your projects that installs extremely fast. Rush makes life easier for JavaScript developers who build and publish many packages from a common Git repo. Lerna operates in a higher level than above package managers’ workspaces but not close to a build system when it has no support for build languages, caching, action directed graphs, or incremental builds. Lerna support filtering packages by name, hoisting common dependencies to root, automatic local linking, versioning, bulk publishing, diffing changes since last release, or running arbitrary commands. Each time you publish, you will get a prompt for each package that has changed to specify if it’s a patch, minor, major or custom change. Independent mode Lerna projects allows maintainers to increment package versions independently of each other. If a module has been updated since the last time a release was made, it will be updated to the new version you’re releasing. Lerna is good at versioning in both fixed and independent mode:įixed mode Lerna projects operate on a single version line kept in lerna.json.
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