A test case for npm 7's handling of prepare scripts in workspaces.

See: https://github.com/npm/cli/issues/3034

git clone git@github.com:timoxley/npm7-prepare-issue.git
cd npm7-prepare-issue
npm install # this will break
npm install # works on second run
# run this to clean up and try again
npm run clean

Key Things:

1. apple depends on banana
2. banana's prepare script sleeps for 2s, touches INSTALLED file, then runs banana/index.js
3. banana/index.js checks for INSTALLED, then prints 'banana'
4. apple's prepare script runs apple/index.js
5. apple/index.js requires banana/index.js, checks for INSTALLED, then prints 'apple'

The problem is that when:

• apple's prepare script runs
• banana's prepare script is still sleeping so
• apple's prepare script errors because banana's INSTALLED file hasn't been created yet.

Note: Using prepublish instead of prepare seems to work fine.