yarn.config.cjs

// @ts-check

/** @type {import('@yarnpkg/types')} */
const { defineConfig, Yarn } = require(`@yarnpkg/types`)

/**
 * This rule will enforce that a workspace MUST depend on the same version of
 * a dependency as the one used by the other workspaces.
 *
 * @param {Yarn.Constraints.Context} context
 */
function enforceConsistentDependenciesAcrossTheProject({ Yarn }) {
  for (const dependency of Yarn.dependencies()) {
    if (dependency.type === `peerDependencies`) continue

    for (const otherDependency of Yarn.dependencies({ ident: dependency.ident })) {
      if (otherDependency.type === `peerDependencies`) continue

      dependency.update(otherDependency.range)
    }
  }
}

module.exports = defineConfig({
  constraints: async ctx => {
    enforceConsistentDependenciesAcrossTheProject(ctx)
  },
})

// https://yarnpkg.com/features/constraints
// https://github.com/yarnpkg/berry/discussions/2825