How to migrate from lerna to pnpm
Migrating from Lerna to pnpm involves restructuring project management, optimizing dependency management, and improving workflow efficiency. The following is a detailed and well-organized migration process, illustrated with a specific example.Step 1: Assess the Existing Lerna Project StructureBefore initiating the migration, conduct a comprehensive assessment of the current Lerna-based project. This includes understanding dependencies between all packages, the build workflow, and the release process.Example:Assume we have a monorepo managed by Lerna containing three packages: , , and . Both and depend on .Step 2: Install and Configure pnpmAfter confirming the project structure and dependencies, install pnpm. pnpm can be installed using npm:Next, to use pnpm within the monorepo, create a file to define workspace settings.Example:Create in the project root with the following content:Step 3: Migrate Dependency Management for Each PackageMigrate dependency management from Lerna to pnpm for each package's . This involves using pnpm commands to install dependencies and ensuring all internal dependencies are correctly configured using pnpm's workspace linking.Example:For , if it depends on , specify the dependency in 's using pnpm syntax:Step 4: Adjust CI/CD ScriptsDuring migration, update CI/CD scripts to use pnpm commands and configurations. This may involve modifying build scripts, test scripts, and deployment scripts.Example:In the CI configuration file, replace npm or yarn commands with pnpm commands:Step 5: Validate and Test the MigrationAfter completing the above steps, conduct comprehensive testing to ensure all packages can correctly install dependencies, build, and run. This may include unit tests, integration tests, and end-to-end tests.Example:Run pnpm commands to verify successful installation and build:Step 6: Cleanup and Optimization After MigrationAfter migration, perform cleanup tasks such as removing unnecessary Lerna configuration files and optimizing new pnpm configurations.By following these steps, you can successfully migrate from Lerna to pnpm, enhancing dependency management efficiency and optimizing the entire project's build and release process. This example should help you understand the specific steps and considerations involved in the migration.