lerna/lerna
Lerna
Lerna is a monorepo management tool, build orchestrator, and package publisher for JavaScript and TypeScript projects. It enables the management of multiple packages within a single shared repository, providing utilities for workspace organization and the coordinated publishing of packages to a registry.
The tool distinguishes itself through dependency-aware task orchestration and automated version management. It uses topological sorting to sequence tasks and utilizes content-hash caching to skip redundant executions when input files remain unchanged. Versioning is automated by parsing standardized commit messages to calculate semantic version numbers and generate release notes.
The system covers a broad range of workspace capabilities, including parallel task execution, hoisted dependency resolution to reduce disk usage, and symlink-based local linking for development. It also provides mechanisms for filtering package scopes using glob patterns or change detection to restrict command execution to specific subsets of the workspace.
Features
- Monorepo Managers - Provides a comprehensive system for coordinating multiple related JavaScript packages within a single repository.
- Monorepo Workflow Orchestration - Manages the build, test, and publishing processes for multiple separate packages residing within a single shared repository.
- Build Orchestrators - Acts as a build orchestrator that manages parallel execution and sequencing for multi-package projects.
- Dependency Installers - Installs and links dependencies across all project packages while hoisting external libraries.
- Local Package Linking - Creates symlinks between internal packages to enable local development and testing without requiring an external registry.
- Task Dependency Linkers - Allows users to specify the execution sequence for tasks to ensure dependent packages are built before successors.
- Topological Task Sequencing - Determines execution order by analyzing package dependencies to ensure a package builds before its dependents.
- Workspace Managers - Manages local package linking and shared dependencies across a multi-package workspace.
- Parallel Execution - Runs scripts across multiple packages using parallel execution and caching to avoid repeating work.
- Symlink-Based Dependency Management - Connects internal packages using filesystem symbolic links to allow local development without publishing to a registry.
- Automated Release Management - Updates version numbers across packages using automated changelogs and commit history to generate project releases.
- Dependency Hoisting - Reduces disk usage and avoids duplicate installations by hoisting shared external libraries to a single root directory.
- Commit-Based Versioning Engines - Calculates the next semantic version number by parsing standardized commit messages from version control history.
- Build Result Caching - Implements content-hash caching to skip redundant executions of build, test, and lint tasks.
- Monorepo Orchestration - Implements dependency-aware orchestration of build, test, and lint tasks across the entire workspace.
- Parallel Task Executors - Runs independent scripts across multiple packages simultaneously while respecting dependency constraints.
- Task Execution Caches - Utilizes content-hash caching to skip redundant task executions when input files remain unchanged.
- Package Publishing - Provides mechanisms to publish multiple packages to a registry using topological ordering and trusted authentication.
- Build Configuration - Allows for the definition of standard input and target defaults to unify how packages are compiled, linted, and tested.
- Execution Scope Filtering - Restricts command execution to specific packages using directory patterns or by identifying changed files.
- Task Execution Filtering - Restricts command execution to specific subsets of the workspace using glob patterns or git-based change detection.
- Build Tools and Bundlers - Build system for managing multi-package repositories.
- Build Tools and Tooling - Build system for managing multi-package repositories.
- Monorepo Management - Tool for managing multi-package projects.
- Project Management Tools - Tool for managing multi-package repositories with git and npm.
