[BUG] 7.20.0 - incorrect interaction with workspace postinstall scripts (worked on 7.19.1)

[TomFoyster]

Is there an existing issue for this?

• I have searched the existing issues

Current Behavior

When running npm i from the project root - the script referenced as the postinstall script in the workspace package json is called. This should not be called when installing from the project root.

Expected Behavior

As in 7.19.1, when running npm i from the project root - the script referenced as the postinstall script in the workspace package json is not called.

Steps To Reproduce

Please see https://github.com/TomFoyster/npm.7.20.0.bug

Environment

• OS: Mac OS 11.2.3
• Node: 15.4.0
• npm: 7.20.0

[TomFoyster]

Apologies - the attached repo has now been made public.

[gavinsharp]

Why don't you expect postinstall to be called in this scenario? Per #3065 and #2900 I think the behaviour change in 7.20.0 was a bug fix for previously broken functionality.

[nlf]

Why don't you expect postinstall to be called in this scenario? Per #3065 and #2900 I think the behaviour change in 7.20.0 was a bug fix for previously broken functionality.

this is exactly the case. the postinstall script for each workspace is meant to be run in this use case. i'm closing this as the current behavior is the intended one.