midgard-yarn-strict

midgard-yarn-strict is a fork of midgard-yarn, which is itself a fork of yarn v1.

Improvements over yarn

• midgard-yarn improves reliability and performance of yarn for large repositories.

• midgard-yarn-strict adds strictness, which is necessary for a more deterministic package installations.

• Scoping, midgard-yarn-strict can install only the dependencies of a subset of the workspaces. (eg. npx midgard-yarn-strict "build-tools-*" will only install the dependencies needed by the workspaces with name starting by "build-tools-")

Usage

Install

Instead of yarn install, run

$ npx midgard-yarn-strict

The installation flags supported by yarn are not supported by the CLI but some are still supported via the yarn config file.

Upgrade or add a dependency

Manual edits to the package.json files is the only current supported way to manage dependencies, no CLI tool is available yet.

yarn link

Not supported (yet).

yarn run

The yarn-run command is not affected by midgard-yarn-strict, so you can still run yarn test for example.

Strictness

Strictness means that workspaces can only use the dependencies that they declare in their package.json. This makes the dependency management processes more predictable.

Configuration

midgard-yarn-strict allows you to declare dependencies on behalf of external packages, this is useful when external packages forgot to declare all their dependencies.

Example: package.json

{
  // rest of package.json
  "extraDependencies": {
    "webpack": {
      "^4.0.0": {
        "dependencies": {
          "webpack-cli": "^4.0.0"
        }
      }
    }
  }
}

Long term

This package is meant as a stopgap solution while waiting for npm to support strictness.

Prior art

This package manager is built on the learnings brought by npm, yarn and pnpm.