How to migrate from lerna to pnpm
Migrating from Lerna to pnpm is a process that involves restructuring the project management structure, optimizing dependency management, and improving workflow processes. Here are the detailed and organized steps for the migration process, with an example to illustrate.Step 1: Evaluate the existing Lerna project structureBefore starting the migration, it's important to conduct a comprehensive evaluation of the current Lerna project. This includes understanding the dependencies between all packages, the build process, and the release process.Example:Suppose we have a monorepo managed by Lerna that includes three packages: package-a, package-b, and package-c. package-a and package-b both depend on package-c.Step 2: Install and configure pnpmAfter confirming the project structure and dependencies, the next step is to install pnpm. pnpm can be installed using npm:npm install -g pnpmThen, to use pnpm in the monorepo, we need to create a pnpm-workspace.yaml file to define the workspace settings.Example:Create a pnpm-workspace.yaml file in the project root directory with the following contents:packages: - 'packages/*'Step 3: Migrate dependency management for each packageSwitch dependency management for each package's package.json from Lerna to pnpm. This includes using pnpm commands to install dependencies and ensuring that all internal dependencies are correctly set up using pnpm's linking method.Example:For package-a, if it depends on package-c, specify the dependency in package-a's package.json using pnpm:"dependencies": { "package-c": "workspace:^1.0.0"}Step 4: Adjust CI/CD scriptsDuring the migration process, make sure to update the scripts for continuous integration and deployment 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:build: script: - pnpm install - pnpm run buildStep 5: Verify and test the migrationAfter completing the above steps, conduct comprehensive testing to ensure that all packages can correctly install dependencies, build, and run. This may include unit testing, integration testing, and end-to-end testing.Example:Run pnpm commands to verify that installation and building were successful:pnpm installpnpm run buildStep 6: Cleanup and optimize after migrationAfter the migration is complete, it may be necessary to clean up the project, such as deleting unnecessary Lerna configuration files and optimizing the new pnpm configuration.By following these steps, we can successfully migrate from Lerna to pnpm, improving efficiency in dependency management and optimizing the entire project's build and release processes. We hope this example helps you understand the specific steps and considerations for migration.