This issue will link all related discussions and RFC.

Prior art (wrappers on top of yarn and npm):

• https://github.com/lerna/lerna
• https://github.com/whitecolor/yall and https://github.com/whitecolor/yalc
• https://github.com/sindresorhus/np (nice publish experience)

RFC:

• RFC for link: :link dependencies rfcs#34, will help when workspaces reference each other
• RFC for workspaces install workspaces phase 1: aggregated install rfcs#60
• RFC for workspaces add/remove/upgrade/* Workspaces phase 2: commands to manage workspaces rfcs#61
• RFC for workspaces linking Workspaces phase 3: linking rfcs#66
• RFC for publishConfig Initial RFC for publishConfig for yarn rfcs#40
• RFC for knit command "yarn knit" -- a command to test libraries while working on them rfcs#41 - simulates publishing a dep instead of just symlinking to a folder. That may be useful for Phase 3 described in workspaces phase 1: aggregated install rfcs#60
• RFC for project: that is similar to knit idea Add 'project:' dependencies rfcs#59
• Full workspaces RFC aggregated [RFC] Yarn Workspaces rfcs#62
• RFC for publish and workspaces (phase 5) (looking for a champion)

Pull requests:

• project: proof of concept Add 'project:' dependencies #3281
• workspaces install phase 1 workspaces: first phase: install node_modules aggregated from all workspaces #3229
• workspaces add/remove commands phase 2 Workspaces phase 2: executing commands #3365
• workspaces linking each other phase 3 & 4 Workspace phase 3 & 4 #3516
• link: PR feat(type): add support for new link: dependency type #3359

Issues/discussions:

• Yarn npm_package_config equivalent #2989 - npm config base equivalent (needs clarification)
• Option to not prune on install #2919, Allow child packages to install into a single node_modules in the root package #711, Support unpublished lerna packages – ignore symlinked packages or not found failures #2863 - common node_modules, should be fixed with Phase 1

Implementation phase:

• (0.25) 1. Installing dependencies of all workspaces in the root node_modules
• (0.26) 2. Commands to manage (add/remove/upgrade) dependencies in workspaces from the parent directory
• (0.27) 3. Ability for workspaces to refer each other, e.g. jest-diff → jest-matcher-utils inside jest monorepo
• (0.27) 4. package-hoister for workspaces, e.g. when dependencies conflict and can't be installed on root level
• 5. Remove the experimental flag and turn on by default
• 6. Command to publish all workspaces in one go (looking for a champion)