![]() ![]() Lerna manually creates links between packages that refer each other after installation has finished.This causes a lot of duplication for each node_modules folder which quite often use the same third-party packages. Lerna calls yarn install multiple times for each package which creates overhead because each package.json is considered independent and they can’t share dependencies with each other.In a nutshell, Lerna calls yarn/npm install for each package inside the project and then creates symlinks between the packages that refer each other.īeing a wrapper of a package manager, Lerna can’t manipulate the contents of node_modules efficiently: install all third party dependencies for each package) a project. Internally it uses Yarn or the npm CLI to bootstrap (i.e. Lerna is a tool that optimizes the workflow around managing multi-package repositories with git and npm. Testing, managing dependencies, and publishing multiple packages quickly gets complicated and many such projects adopt tools such as Lerna to make working with monorepos easier. However, separating pieces of projects into their own folders is sometimes not enough. ![]() Several projects used every day by JavaScript developers are managed as monorepos: Babel, React, Jest, Vue, Angular. To make the process easier, some big projects adopted a monorepo approach, or multi-package repositories, which reduces the burden of writing code across packages. Those who have tried splitting a project into multiple packages know how hard it is to make changes across multiple packages at one time. For example, Jest, being a generic testing tool, gave birth to many packages, one of them is jest-snapshot that is now used in other projects like snapguidist and chai-jest-snapshot. Projects tend to grow over time, and, occasionally, some pieces of a project can be useful elsewhere in other projects. ![]()
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