Current Behavior:

running npm prune --json shows that it is adding packages. The documentation does not explain why. It states that this command is to remove extraneous packages not listed in package json file.

My question is for an explanation as to why it is adding additional packages?
If it should not then this is a bug. If it is the correct behaviour can it be explained and also added to the prune documentation please.

Thank you.

Expected Behavior:

I would expect this command to only remove extraneous packages and to add nothing.

Steps To Reproduce:

Command and output below:

npm prune --dry-run --json

`
npm WARN bootstrap@4.5.3 requires a peer of jquery@1.9.1 - 3 but none is installed. You must install peer dependencies yourself.
npm WARN bootstrap@4.5.3 requires a peer of popper.js@^1.16.1 but none is installed. You must install peer dependencies yourself.
npm WARN eslint-config-react-app@6.0.0 requires a peer of eslint-plugin-import@^2.22.0 but none is installed. You must install peer dependencies yourself.
npm WARN eslint-config-react-app@6.0.0 requires a peer of eslint-plugin-jsx-a11y@^6.3.1 but none is installed. You must install peer dependencies yourself.
npm WARN eslint-plugin-import@2.9.0 requires a peer of eslint@2.x - 4.x but none is installed. You must install peer dependencies yourself.
npm WARN eslint-plugin-jsx-a11y@6.2.1 requires a peer of eslint@^3 || ^4 || ^5 but none is installed. You must install peer dependencies yourself.
npm WARN eslint-watch@5.1.2 requires a peer of eslint@>=4 <6.0.0 but none is installed. You must install peer dependencies yourself.

{
"added": [
{
"action": "add",
"name": "babel-plugin-jest-hoist",
"version": "26.6.2",
"path": "node_modules/react-scripts/node_modules/babel-plugin-jest-hoist"
},
{
"action": "add",
"name": "babel-preset-jest",
"version": "26.6.2",
"path": "node_modules/react-scripts/node_modules/babel-preset-jest"
}
],
"removed": [],
"updated": [],
"moved": [],
"failed": [],
"warnings": [
"bootstrap@4.5.3 requires a peer of jquery@1.9.1 - 3 but none is installed. You must install peer dependencies yourself.",
"bootstrap@4.5.3 requires a peer of popper.js@^1.16.1 but none is installed. You must install peer dependencies yourself.",
"eslint-config-react-app@6.0.0 requires a peer of eslint-plugin-import@^2.22.0 but none is installed. You must install peer dependencies yourself.",
"eslint-config-react-app@6.0.0 requires a peer of eslint-plugin-jsx-a11y@^6.3.1 but none is installed. You must install peer dependencies yourself.",
"eslint-plugin-import@2.9.0 requires a peer of eslint@2.x - 4.x but none is installed. You must install peer dependencies yourself.",
"eslint-plugin-jsx-a11y@6.2.1 requires a peer of eslint@^3 || ^4 || ^5 but none is installed. You must install peer dependencies yourself.",
"eslint-watch@5.1.2 requires a peer of eslint@>=4 <6.0.0 but none is installed. You must install peer dependencies yourself."
],
"audit": {
"actions": [],
"advisories": {},
"muted": [],
"metadata": {
"vulnerabilities": {
"info": 0,
"low": 0,
"moderate": 0,
"high": 0,
"critical": 0
},
"dependencies": 2510,
"devDependencies": 782,
"optionalDependencies": 32,
"totalDependencies": 3316
}
},
"funding": "151 packages are looking for funding",
"elapsed": 10742
}
`

Environment:

• OS: Macbook Pro Big Sur v11.1
  npm: '6.13.4',
  ares: '1.15.0',
  brotli: '1.0.7',
  cldr: '35.1',
  http_parser: '2.8.0',
  icu: '64.2',
  llhttp: '2.0.1',
  modules: '72',
  napi: '5',
  nghttp2: '1.40.0',
  node: '12.14.1',
  openssl: '1.1.1d',
  tz: '2019c',
  unicode: '12.1',
  uv: '1.33.1',
  v8: '7.7.299.13-node.16',
  zlib: '1.2.11'
  -->