Lerna
UnclaimedA fast, modern build system for managing and publishing multiple JavaScript/TypeScript packages.
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TL;DR - Lerna
- Manages and publishes multiple JavaScript/TypeScript packages in monorepos.
- Offers fast, efficient task execution with advanced caching and parallelization.
- Simplifies versioning and publishing packages to npm with flexible strategies.
Pricing: Free forever
Best for: Individuals & startups
Pros & Cons
Pros
- Significantly speeds up monorepo build and test times
- Reduces CI times through caching and distributed execution
- Simplifies the complex process of publishing multiple packages
- Provides clear structure and management for large codebases
- Widely adopted and battle-tested in the JavaScript ecosystem
Cons
- Requires understanding of monorepo concepts
- Initial setup might have a learning curve for new users
- Dependency on Nx for modern task runner features
Key Features
Efficient task runner for npm scripts across multiple projectsAdvanced computation caching to avoid rebuilding same codeDistributed cache for sharing between developers and CI/CDTarget dependencies configuration for task execution orderInfinite scaling with distributed execution across multiple machinesPowerful interactive workspace visualizerDynamic CLI for relevant command outputMinimal configuration requirements
Pricing
Free
Lerna is completely free to use with no hidden costs.
About Lerna
By Toolradar Team·
Lerna is a powerful build system designed for JavaScript and TypeScript monorepos. It helps developers manage and publish multiple packages from a single repository efficiently. By leveraging advanced caching, parallel execution, and distributed task running, Lerna significantly speeds up development workflows and CI/CD processes for monorepo projects.
This tool is ideal for teams and developers working with monorepos, enabling them to share code, establish clear ownership, and maintain fast, unified continuous integration. Lerna simplifies the complexities of monorepo management by providing a unified solution for running tasks, linking packages, and publishing them to npm, reducing configuration overhead and improving overall productivity.
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Lerna FAQ
How does Lerna ensure that tasks are not unnecessarily re-executed?
Lerna prevents redundant task execution by utilizing a computation cache. It stores the results and terminal output of previously run tasks, and if the same task is encountered again, it restores these cached artifacts instead of re-running the computation.
Can Lerna distribute task execution across multiple machines?
Yes, Lerna supports distributed execution, allowing tasks to run across multiple machines without requiring additional configuration. This capability helps in scaling and reducing overall CI times.
What is the primary difference between `lerna version` and `lerna publish`?
lerna version increments package version numbers, commits these changes, and tags them in the repository. In contrast, lerna publish performs all the actions of lerna version and additionally pushes the updated packages to npm.How does Lerna handle environment variables for tasks?
The modern task runner in Lerna, powered by Nx, automatically loads
.env files by default. This behavior can be disabled for specific tasks by setting the --load-env-files flag to false.What are the two main versioning strategies supported by Lerna for publishing packages?
Lerna supports two versioning strategies: Fixed/Locked mode and Independent mode. Fixed mode maintains a single version line for all packages in
lerna.json, while Independent mode allows each package to have its own distinct version.How can I publish only packages that have been updated since their last release to npm?
You can use
lerna publish from-package. This command compares the version of each package in the repository with its published version on npm and only publishes packages where the repository version is greater.Source: lerna.js.org