`nx migrate --run-migrations` installs deps with `legacy-peer-deps=true` (even for projects without this legacy config)

[nsbarsukov]

Current Behavior

Use project without legacy-peer-deps=true.

Run the following command

nx migrate --run-migrations

it logs:

 NX   Running 'npm install' to make sure necessary packages are installed

removed 297 packages, and audited 2714 packages in 4s

and then throws error:

Cannot find module 'ts-morph'

(actually, this dependency node_modules/ts-morph existed before running nx migrate --run-migrations).

---

Use the following command instead

npm_config_legacy_peer_deps=false nx migrate --run-migrations

Everything is okay, no error.

Expected Behavior

Default command

nx migrate --run-migrations

works without error for default project configuration (without legacy-peer-deps=true).

GitHub Repo

https://github.com/taiga-family/maskito/pull/1337

Steps to Reproduce

1. Clone this repository https://github.com/taiga-family/maskito

2. Switch to branch nx-legacy-peer-deps-demo

3. Run the following commands

   nvm use 18

   npm ci

   nx migrate --run-migrations

   It will throw error

4. Then revert changes inside package-lock.json and run again npm ci.

5. Run the following command

   npm_config_legacy_peer_deps=false nx migrate --run-migrations

Everything is okay, no error.

Read more in-depth description in the body of this PR:

• https://github.com/taiga-family/maskito/pull/1337

Nx Report

NX   Report complete - copy this into the issue template

Node   : 18.19.1
OS     : darwin-arm64
npm    : 10.2.4

nx (global)    : 19.0.3
nx             : 19.3.1
@nx/js         : 19.3.1
@nx/jest       : 19.3.1
@nx/linter     : 19.3.1
@nx/eslint     : 19.3.1
@nx/workspace  : 19.3.1
@nx/angular    : 19.3.1
@nx/cypress    : 19.3.1
@nx/devkit     : 19.3.1
@nx/react      : 19.3.1
@nx/rollup     : 19.3.1
@nrwl/tao      : 19.3.1
@nx/web        : 19.3.1
@nx/webpack    : 19.3.1
typescript     : 4.9.5

Failure Logs

No response

Package Manager Version

No response

Operating System

• [X] macOS
• [ ] Linux
• [ ] Windows
• [ ] Other (Please specify)

Additional Information

Probably, the problem relates to the following lines from nx-library:

if (detectPackageManager() === 'npm') {
    process.env.npm_config_legacy_peer_deps ??= 'true';
}

[denny99]

I was always wondering why the npm i command, when used in the NX Plugins, removes some packages.

But perhaps this is quite important?

E.g. when upgrading packages from one version to another. Without the legacy peer deps the install might fail, as some packages will get their new version only after the upgrade (e.g. Angular CLI Version gets only upgraded during the actual migration execution)

Maybe an npm i -f might be a solution?

[cainlevy]

Workaround is to run npm install yourself:

npm install
NX_MIGRATE_SKIP_INSTALL=true npx nx _migrate --run-migrations --if-exists

I plan to make this a script in my root package.json.

[therockstorm]

Another workaround is:

npm_config_legacy_peer_deps=false npx nx migrate --run-migrations --if-exists