Yarn does not allow duplicate workspace names

[NullVoxPopuli]

Got this error on 1.5

❯ npx ember-cli addon ember-qunit -b @embroider/addon-blueprint
Command failed with exit code 1: yarn install
Internal Error: Duplicate workspace name ember-qunit: Development/tmp/ember-qunit/ember-qunit conflicts with Development/tmp/ember-qunit

[simonihmig]

Just ran the above command, and it was working fine for me! 🤔

Which version for yarn are you using?

[NullVoxPopuli]

I had yarn@v4-alpha 😅

works with yarn@v1

[NullVoxPopuli]

Results of:

npx ember-cli@latest addon my-yarn-test \
  -b @embroider/addon-blueprint \
  --yarn

• yarn@v1: no error ... but no one should be using yarn@v1 🙃
• yarn@v2: this actually doesn't exist, afaict
• yarn@v3: Duplicate workspace name
• yarn@v4: Duplicate workspace name

For testing with volta

• yarn@v1: volta install yarn@1
• yarn@v3: volta install yarn@3
• yarn@v4: volta install yarn

[NullVoxPopuli]

Closed by #120