npm WARN deprecated @npmcli/[email protected]: This functionality has been moved to @npmcli/fs

Tested with Node 18.12.1 / npm 8.19.2 and Node 16.13.2 / npm 8.1.2

I updated my Angular CLI the other day and received the following npm deprecation warning:

npm WARN deprecated @npmcli/[email protected]: This functionality has been moved to @npmcli/fs

It's just a warning so it didn't affect the CLI update and everything worked correctly, but I was curious to see what was causing it.

At first I thought it was because I wasn't using the latest version of the npm CLI (8.1.2 and Node.js (16.13.2), so I updated to the latest LTS version of Node 18.12.1 and npm 8.19.2 and re-installed the Angular CLI, but the same npm warning appeared.

Then I had a look through the dependencies of the npm CLI running on my machine and found the culprit. The npm package includes the dependencies "@npmcli/arborist": "^5.6.2" and "cacache": "^16.1.3", and both of these packages still use the now deprecated "@npmcli/move-file": "^2.0.0".

npm dependencies

Here's a cut down version of my npm package.json file including the dependencies that cause the warning:

{
  "version": "8.19.2",
  "name": "npm",
  "description": "a package manager for JavaScript",
  ...
  "dependencies": {
    ...
    "@npmcli/arborist": "^5.6.2",
    ...
    "cacache": "^16.1.3",
    ...
  },
  ...
}

@npmcli/arborist dependencies

Here's a cut down version of the @npmcli/arborist package.json file that includes the dependency on @npmcli/move-file:

{
  "name": "@npmcli/arborist",
  "version": "5.6.2",
  "description": "Manage node_modules trees",
  "dependencies": {
    ...
    "@npmcli/move-file": "^2.0.0",
    ...
  },
  ...
}

cacache dependencies

And here's a cut down version of the cacache package.json file that includes the dependency on @npmcli/move-file:

{
  "name": "cacache",
  "version": "16.1.3",
  ...
  "description": "Fast, fault-tolerant, cross-platform, disk-based, data-agnostic, content-addressable cache.",
  ...
  "dependencies": {
    ...
    "@npmcli/move-file": "^2.0.0",
    ...
  },
  ...
}

It looks like packages are being switched over to @npmcli/fs which should remove the warning in future versions. Here's a recent commit on the cacache GitHub repo to fix it - https://github.com/npm/cacache/commit/4a7382f5e6c72c59587d45167346c1b6e81a3cde.