[BUG] ERR! this.idealTree.children.get is not a function

[maksimr]

Is there an existing issue for this?

• I have searched the existing issues

This issue exists in the latest npm version

• I am using the latest npm

Current Behavior

Get an error when try to install dependencies for specific workspace using "linked" strategy

mk bar \
  && pushd bar \
  && npm init -y \
  && npm init -y -w foo-1 \
  && npm install --install-strategy=linked -w foo-1

Expected Behavior

Install dependencies only for passed workspace using "linked" strategy

Steps To Reproduce

Darwin 23.2.0
node v20.9.0
npm  v10.1.0

3. Run

mk /tmp/bar \
  && pushd /tmp/bar \
  && npm init -y \
  && npm init -y -w foo-1 \
  && npm install --install-strategy=linked -w foo-1

5. See error:

npm ERR! this.idealTree.children.get is not a function

Environment

• npm: v10.1.0
• Node.js: v20.9.0
• OS Name: Darwin 23.2.0
• System Model Name: MacBook Air
• npm config:

; node bin location = /Users/maksimrv/.nvm/versions/node/v20.9.0/bin/node
; node version = v20.9.0
; npm local prefix = /private/tmp/bar
; npm version = 10.1.0
; cwd = /private/tmp/bar
; HOME = /Users/maksimrv
; Run `npm config ls -l` to show all defaults.

[maksimr]

Just proof of concept. All works fine if modify this line

this.idealTree.children in case of "linked" strategy contains Array instead of Set

[ljharb]

Seems like perhaps the bug, then, is that it doesn't always contain a Set. Where is it created as an Array? perhaps that can be changed instead.

[maksimr]

Where is it created as an Array?

It replaced on Array here -> isolated-reifier

[ljharb]

and would wrapping that array in new Set() fix the problem?

[maksimr]

and would wrapping that array in new Set() fix the problem?

Yah, if add something like this:

    root.children = new Map(root.children.map(c => [c.name, c]))

fixes error but looks like it doesn't work correctly because:

1. Install all dependencies
2. Does not link some modules

: (

[ljharb]

not new Map, new Set - since you said it's a Set in the other code paths.

There may be other places that assume it's an array that also need updating, ofc.

[maksimr]

not new Map, new Set - since you said it's a Set in the other code paths.

There may be other places that assume it's an array that also need updating, ofc.

Actually, there is a Map not a Set. I'm not sure why I wrote Set

const ideal = this.idealTree.children.get(ws)

[Juknum]

Hi, any update on this issue?

[kristojorg]

Can't have two version of a package installed with npm, can't fix it due to this bug :/

[owlstronaut]

Fixed by #8996