[BUG] "npm rebuild" runs any symlinked package's lifecycle scripts twice.

[DeeDeeG]

Current Behavior:

A package dependency installed as a symlink will get its lifecycle scripts (such as postinstall) run twice when running the npm rebuild subcommand of npm.

Expected Behavior:

Lifecycle scripts should probably only be run once.

Steps To Reproduce:

Set up a minimal/dummy dependency with lifecycle scripts:

• mkdir test && cd test && npm init -y
• mkdir dependency && cd dependency && npm init -y
• Add this as a preinstall script for the dependency dummy package: "preinstall": "echo 'You will see this twice!'

Add the dummy package with lifecycle scripts as a symlinked dependency:

• cd ..
• npm install ./dependency

Run npm rebuild and verify that the lifecycle script runs twice:

• npm rebuild --foreground-scripts

Example output:

% npm rebuild --foreground-scripts

> dependency@1.0.0 preinstall
> echo 'You will see this twice!'

You will see this twice!

> dependency@1.0.0 preinstall
> echo 'You will see this twice!'

You will see this twice!
rebuilt dependencies successfully

Environment:

• OS: macOS Catalina 10.15.7
• Node: v15.12.0
• npm: 7.6.3