feat: add pnpm dedupe command (#5958)

.changeset/giant-crews-push.md

@@ -0,0 +1,7 @@
+---
+"@pnpm/plugin-commands-installation": minor
+"@pnpm/core": minor
+pnpm: minor
+---
+
+Add a `pnpm dedupe` command that removes dependencies from the lockfile by re-resolving the dependency graph. This work similar to yarn's [`yarn dedupe --strategy highest`](https://yarnpkg.com/cli/dedupe) command.

__fixtures__/workspace-with-lockfile-dupes/package.json

@@ -0,0 +1 @@
+{}

__fixtures__/workspace-with-lockfile-dupes/packages/bar/package.json

@@ -0,0 +1,6 @@
+{
+  "name": "bar",
+  "dependencies": {
+    "ajv": "^6.10.2"
+  }
+}

__fixtures__/workspace-with-lockfile-dupes/packages/foo/package.json

@@ -0,0 +1,6 @@
+{
+  "name": "foo",
+  "dependencies": {
+    "ajv": "^6.12.5"
+  }
+}

__fixtures__/workspace-with-lockfile-dupes/pnpm-lock.yaml

@@ -0,0 +1,80 @@
+lockfileVersion: 5.4
+
+importers:
+
+  .:
+    specifiers: {}
+
+  packages/bar:
+    specifiers:
+      ajv: ^6.10.2
+    dependencies:
+      ajv: 6.10.2
+
+  packages/foo:
+    specifiers:
+      ajv: ^6.12.5
+    dependencies:
+      ajv: 6.12.6
+
+packages:
+
+  /ajv/6.10.2:
+    resolution: {integrity: sha512-TXtUUEYHuaTEbLZWIKUr5pmBuhDLy+8KYtPYdcV8qC+pOZL+NKqYwvWSRrVXHn+ZmRRAu8vJTAznH7Oag6RVRw==}
+    dependencies:
+      fast-deep-equal: 2.0.1
+      fast-json-stable-stringify: 2.0.0
+      json-schema-traverse: 0.4.1
+      uri-js: 4.2.2
+    dev: false
+
+  /ajv/6.12.6:
+    resolution: {integrity: sha512-j3fVLgvTo527anyYyJOGTYJbG+vnnQYvE0m5mmkc1TK+nxAppkCLMIL0aZ4dblVCNoGShhm+kzE4ZUykBoMg4g==}
+    dependencies:
+      fast-deep-equal: 3.1.3
+      fast-json-stable-stringify: 2.1.0
+      json-schema-traverse: 0.4.1
+      uri-js: 4.4.1
+    dev: false
+
+  /fast-deep-equal/2.0.1:
+    resolution: {integrity: sha512-bCK/2Z4zLidyB4ReuIsvALH6w31YfAQDmXMqMx6FyfHqvBxtjC0eRumeSu4Bs3XtXwpyIywtSTrVT99BxY1f9w==}
+    dev: false
+
+  /fast-deep-equal/3.1.3:
+    resolution: {integrity: sha512-f3qQ9oQy9j2AhBe/H9VC91wLmKBCCU/gDOnKNAYG5hswO7BLKj09Hc5HYNz9cGI++xlpDCIgDaitVs03ATR84Q==}
+    dev: false
+
+  /fast-json-stable-stringify/2.0.0:
+    resolution: {integrity: sha1-1RQsDK7msRifh9OnYREGT4bIu/I=}
+    dev: false
+
+  /fast-json-stable-stringify/2.1.0:
+    resolution: {integrity: sha512-lhd/wF+Lk98HZoTCtlVraHtfh5XYijIjalXck7saUtuanSDyLMxnHhSXEDJqHxD7msR8D0uCmqlkwjCV8xvwHw==}
+    dev: false
+
+  /json-schema-traverse/0.4.1:
+    resolution: {integrity: sha512-xbbCH5dCYU5T8LcEhhuh7HJ88HXuW3qsI3Y0zOZFKfZEHcpWiHU/Jxzk629Brsab/mMiHQti9wMP+845RPe3Vg==}
+    dev: false
+
+  /punycode/2.1.1:
+    resolution: {integrity: sha512-XRsRjdf+j5ml+y/6GKHPZbrF/8p2Yga0JPtdqTIY2Xe5ohJPD9saDJJLPvp9+NSBprVvevdXZybnj2cv8OEd0A==}
+    engines: {node: '>=6'}
+    dev: false
+
+  /punycode/2.3.0:
+    resolution: {integrity: sha512-rRV+zQD8tVFys26lAGR9WUuS4iUAngJScM+ZRSKtvl5tKeZ2t5bvdNFdNHBW9FWR4guGHlgmsZ1G7BSm2wTbuA==}
+    engines: {node: '>=6'}
+    dev: false
+
+  /uri-js/4.2.2:
+    resolution: {integrity: sha512-KY9Frmirql91X2Qgjry0Wd4Y+YTdrdZheS8TFwvkbLWf/G5KNJDCh6pKL5OZctEW4+0Baa5idK2ZQuELRwPznQ==}
+    dependencies:
+      punycode: 2.1.1
+    dev: false
+
+  /uri-js/4.4.1:
+    resolution: {integrity: sha512-7rKUyy33Q1yc98pQ1DAmLtwX109F7TIfWlW1Ydo8Wl1ii1SeHieeh0HHfPeL2fMXK6z0s8ecKs9frCuLJvndBg==}
+    dependencies:
+      punycode: 2.3.0
+    dev: false

__fixtures__/workspace-with-lockfile-dupes/pnpm-workspace.yaml

@@ -0,0 +1,2 @@
+packages:
+  - 'packages/**'

__fixtures__/workspace-with-lockfile-subdep-dupes/package.json

@@ -0,0 +1 @@
+{}

__fixtures__/workspace-with-lockfile-subdep-dupes/packages/bar/package.json

@@ -0,0 +1,6 @@
+{
+  "name": "bar",
+  "dependencies": {
+    "uri-js": "=4.2.2"
+  }
+}

__fixtures__/workspace-with-lockfile-subdep-dupes/packages/foo/package.json

@@ -0,0 +1,6 @@
+{
+  "name": "foo",
+  "dependencies": {
+    "uri-js": "=4.4.1"
+  }
+}

__fixtures__/workspace-with-lockfile-subdep-dupes/pnpm-lock.yaml

@@ -0,0 +1,42 @@
+lockfileVersion: 5.4
+
+importers:
+
+  .:
+    specifiers: {}
+
+  packages/bar:
+    specifiers:
+      uri-js: '=4.2.2'
+    dependencies:
+      uri-js: 4.2.2
+
+  packages/foo:
+    specifiers:
+      uri-js: '=4.4.1'
+    dependencies:
+      uri-js: 4.4.1
+
+packages:
+
+  /punycode/2.1.1:
+    resolution: {integrity: sha512-XRsRjdf+j5ml+y/6GKHPZbrF/8p2Yga0JPtdqTIY2Xe5ohJPD9saDJJLPvp9+NSBprVvevdXZybnj2cv8OEd0A==}
+    engines: {node: '>=6'}
+    dev: false
+
+  /punycode/2.3.0:
+    resolution: {integrity: sha512-rRV+zQD8tVFys26lAGR9WUuS4iUAngJScM+ZRSKtvl5tKeZ2t5bvdNFdNHBW9FWR4guGHlgmsZ1G7BSm2wTbuA==}
+    engines: {node: '>=6'}
+    dev: false
+
+  /uri-js/4.2.2:
+    resolution: {integrity: sha512-KY9Frmirql91X2Qgjry0Wd4Y+YTdrdZheS8TFwvkbLWf/G5KNJDCh6pKL5OZctEW4+0Baa5idK2ZQuELRwPznQ==}
+    dependencies:
+      punycode: 2.1.1
+    dev: false
+
+  /uri-js/4.4.1:
+    resolution: {integrity: sha512-7rKUyy33Q1yc98pQ1DAmLtwX109F7TIfWlW1Ydo8Wl1ii1SeHieeh0HHfPeL2fMXK6z0s8ecKs9frCuLJvndBg==}
+    dependencies:
+      punycode: 2.3.0
+    dev: false

__fixtures__/workspace-with-lockfile-subdep-dupes/pnpm-workspace.yaml

@@ -0,0 +1,2 @@
+packages:
+  - 'packages/**'

pkg-manager/core/src/install/extendInstallOptions.ts

@@ -37,6 +37,7 @@ export interface StrictInstallOptions {
   linkWorkspacePackagesDepth: number
   lockfileOnly: boolean
   fixLockfile: boolean
+  dedupe: boolean
   ignoreCompatibilityDb: boolean
   ignoreDepScripts: boolean
   ignorePackageManifest: boolean

pkg-manager/core/src/install/index.ts

@@ -305,6 +305,7 @@ export async function mutateModules (
       !ctx.lockfileHadConflicts &&
       !opts.update &&
       !opts.fixLockfile &&
+      !opts.dedupe &&
       installsOnly &&
       (
         frozenLockfile && !opts.lockfileOnly ||
@@ -644,6 +645,27 @@ function forgetResolutionsOfPrevWantedDeps (importer: ProjectSnapshot, wantedDep
   }
 }
 
+function forgetResolutionsOfAllPrevWantedDeps (wantedLockfile: Lockfile) {
+  // Similar to the forgetResolutionsOfPrevWantedDeps function above, we can
+  // delete existing resolutions in importers to make sure they're resolved
+  // again.
+  if ((wantedLockfile.importers != null) && !isEmpty(wantedLockfile.importers)) {
+    wantedLockfile.importers = mapValues(
+      ({ dependencies, devDependencies, optionalDependencies, ...rest }) => rest,
+      wantedLockfile.importers)
+  }
+
+  // The resolveDependencies function looks at previous PackageSnapshot
+  // dependencies/optionalDependencies blocks and merges them with new resolved
+  // deps. Clear the previous PackageSnapshot fields so the newly resolved deps
+  // are always used.
+  if ((wantedLockfile.packages != null) && !isEmpty(wantedLockfile.packages)) {
+    wantedLockfile.packages = mapValues(
+      ({ dependencies, optionalDependencies, ...rest }) => rest,
+      wantedLockfile.packages)
+  }
+}
+
 export async function addDependenciesToPackage (
   manifest: ProjectManifest,
   dependencySelectors: string[],
@@ -798,6 +820,15 @@ const _installInContext: InstallFunction = async (projects, ctx, opts) => {
     }), ctx.wantedLockfile.packages)
   }
 
+  if (opts.dedupe) {
+    // Deleting recorded version resolutions from importers and packages. These
+    // fields will be regenerated using the preferred versions computed above.
+    //
+    // This is a bit different from a "full resolution", which completely
+    // ignores preferred versions from the lockfile.
+    forgetResolutionsOfAllPrevWantedDeps(ctx.wantedLockfile)
+  }
+
   let {
     dependenciesGraph,
     dependenciesByProjectId,

pkg-manager/plugin-commands-installation/package.json

@@ -46,6 +46,7 @@
     "@types/yarnpkg__lockfile": "^1.1.5",
     "@types/zkochan__table": "npm:@types/table@6.0.0",
     "delay": "^5.0.0",
+    "jest-diff": "^29.3.1",
     "path-name": "^1.0.0",
     "proxyquire": "^2.1.3",
     "read-yaml-file": "^2.1.0",

pkg-manager/plugin-commands-installation/src/dedupe.ts

@@ -0,0 +1,37 @@
+import { docsUrl } from '@pnpm/cli-utils'
+import { UNIVERSAL_OPTIONS } from '@pnpm/common-cli-options-help'
+import renderHelp from 'render-help'
+import * as install from './install'
+
+export const rcOptionsTypes = cliOptionsTypes
+
+export function cliOptionsTypes () {
+  return {}
+}
+
+export const commandNames = ['dedupe']
+
+export function help () {
+  return renderHelp({
+    description: 'Perform an install removing older dependencies in the lockfile if a newer version can be used.',
+    descriptionLists: [
+      {
+        title: 'Options',
+        list: [
+          ...UNIVERSAL_OPTIONS,
+        ],
+      },
+    ],
+    url: docsUrl('dedupe'),
+    usages: ['pnpm dedupe'],
+  })
+}
+
+export async function handler (
+  opts: install.InstallCommandOptions
+) {
+  return install.handler({
+    ...opts,
+    dedupe: true,
+  })
+}

pkg-manager/plugin-commands-installation/src/index.ts

@@ -1,4 +1,5 @@
 import * as add from './add'
+import * as dedupe from './dedupe'
 import * as install from './install'
 import * as fetch from './fetch'
 import * as link from './link'
@@ -8,4 +9,4 @@ import * as unlink from './unlink'
 import * as update from './update'
 import * as importCommand from './import'
 
-export { add, fetch, install, link, prune, remove, unlink, update, importCommand }
+export { add, dedupe, fetch, install, link, prune, remove, unlink, update, importCommand }

pkg-manager/plugin-commands-installation/src/install.ts

@@ -293,6 +293,7 @@ export type InstallCommandOptions = Pick<Config,
   pruneDirectDependencies?: boolean
   pruneStore?: boolean
   recursive?: boolean
+  dedupe?: boolean
   saveLockfile?: boolean
   workspace?: boolean
 } & Partial<Pick<Config, 'modulesCacheMaxAge' | 'pnpmHomeDir' | 'preferWorkspacePackages'>>

pkg-manager/plugin-commands-installation/src/installDeps.ts

@@ -90,6 +90,7 @@ export type InstallDepsOptions = Pick<Config,
   updatePackageManifest?: boolean
   useBetaCli?: boolean
   recursive?: boolean
+  dedupe?: boolean
   workspace?: boolean
 } & Partial<Pick<Config, 'pnpmHomeDir'>>
 

pkg-manager/plugin-commands-installation/test/__snapshots__/dedupe.ts.snap

@@ -0,0 +1,124 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`pnpm dedupe updates old resolutions from importers block and removes old packages 1`] = `
+"- Expected
++ Received
+
+@@ -5,7 +5,7 @@
+      },
+      "packages/bar": Object {
+        "dependencies": Object {
+-         "ajv": "6.10.2",
++         "ajv": "6.12.6",
+        },
+        "specifiers": Object {
+          "ajv": "^6.10.2",
+@@ -22,18 +22,6 @@
+    },
+    "lockfileVersion": 5.4,
+    "packages": Object {
+-     "/ajv/6.10.2": Object {
+-       "dependencies": Object {
+-         "fast-deep-equal": "2.0.1",
+-         "fast-json-stable-stringify": "2.0.0",
+-         "json-schema-traverse": "0.4.1",
+-         "uri-js": "4.2.2",
+-       },
+-       "dev": false,
+-       "resolution": Object {
+-         "integrity": "sha512-TXtUUEYHuaTEbLZWIKUr5pmBuhDLy+8KYtPYdcV8qC+pOZL+NKqYwvWSRrVXHn+ZmRRAu8vJTAznH7Oag6RVRw==",
+-       },
+-     },
+      "/ajv/6.12.6": Object {
+        "dependencies": Object {
+          "fast-deep-equal": "3.1.3",
+@@ -44,24 +32,12 @@
+        "dev": false,
+        "resolution": Object {
+          "integrity": "sha512-j3fVLgvTo527anyYyJOGTYJbG+vnnQYvE0m5mmkc1TK+nxAppkCLMIL0aZ4dblVCNoGShhm+kzE4ZUykBoMg4g==",
+-       },
+-     },
+-     "/fast-deep-equal/2.0.1": Object {
+-       "dev": false,
+-       "resolution": Object {
+-         "integrity": "sha512-bCK/2Z4zLidyB4ReuIsvALH6w31YfAQDmXMqMx6FyfHqvBxtjC0eRumeSu4Bs3XtXwpyIywtSTrVT99BxY1f9w==",
+        },
+      },
+      "/fast-deep-equal/3.1.3": Object {
+        "dev": false,
+        "resolution": Object {
+          "integrity": "sha512-f3qQ9oQy9j2AhBe/H9VC91wLmKBCCU/gDOnKNAYG5hswO7BLKj09Hc5HYNz9cGI++xlpDCIgDaitVs03ATR84Q==",
+-       },
+-     },
+-     "/fast-json-stable-stringify/2.0.0": Object {
+-       "dev": false,
+-       "resolution": Object {
+-         "integrity": "sha1-1RQsDK7msRifh9OnYREGT4bIu/I=",
+        },
+      },
+      "/fast-json-stable-stringify/2.1.0": Object {
+@@ -75,16 +51,7 @@
+        "resolution": Object {
+          "integrity": "sha512-xbbCH5dCYU5T8LcEhhuh7HJ88HXuW3qsI3Y0zOZFKfZEHcpWiHU/Jxzk629Brsab/mMiHQti9wMP+845RPe3Vg==",
+        },
+-     },
+-     "/punycode/2.1.1": Object {
+-       "dev": false,
+-       "engines": Object {
+-         "node": ">=6",
+      },
+-       "resolution": Object {
+-         "integrity": "sha512-XRsRjdf+j5ml+y/6GKHPZbrF/8p2Yga0JPtdqTIY2Xe5ohJPD9saDJJLPvp9+NSBprVvevdXZybnj2cv8OEd0A==",
+-       },
+-     },
+      "/punycode/2.3.0": Object {
+        "dev": false,
+        "engines": Object {
+@@ -92,15 +59,6 @@
+        },
+        "resolution": Object {
+          "integrity": "sha512-rRV+zQD8tVFys26lAGR9WUuS4iUAngJScM+ZRSKtvl5tKeZ2t5bvdNFdNHBW9FWR4guGHlgmsZ1G7BSm2wTbuA==",
+-       },
+-     },
+-     "/uri-js/4.2.2": Object {
+-       "dependencies": Object {
+-         "punycode": "2.1.1",
+-       },
+-       "dev": false,
+-       "resolution": Object {
+-         "integrity": "sha512-KY9Frmirql91X2Qgjry0Wd4Y+YTdrdZheS8TFwvkbLWf/G5KNJDCh6pKL5OZctEW4+0Baa5idK2ZQuELRwPznQ==",
+        },
+      },
+      "/uri-js/4.4.1": Object {"
+`;
+
+exports[`pnpm dedupe updates old resolutions from package block 1`] = `
+"- Expected
++ Received
+
+@@ -22,15 +22,6 @@
+    },
+    "lockfileVersion": 5.4,
+    "packages": Object {
+-     "/punycode/2.1.1": Object {
+-       "dev": false,
+-       "engines": Object {
+-         "node": ">=6",
+-       },
+-       "resolution": Object {
+-         "integrity": "sha512-XRsRjdf+j5ml+y/6GKHPZbrF/8p2Yga0JPtdqTIY2Xe5ohJPD9saDJJLPvp9+NSBprVvevdXZybnj2cv8OEd0A==",
+-       },
+-     },
+      "/punycode/2.3.0": Object {
+        "dev": false,
+        "engines": Object {
+@@ -42,7 +33,7 @@
+      },
+      "/uri-js/4.2.2": Object {
+        "dependencies": Object {
+-         "punycode": "2.1.1",
++         "punycode": "2.3.0",
+        },
+        "dev": false,
+        "resolution": Object {"
+`;

pkg-manager/plugin-commands-installation/test/dedupe.ts

@@ -0,0 +1,91 @@
+import path from 'path'
+import { readProjects } from '@pnpm/filter-workspace-packages'
+import { Lockfile } from '@pnpm/lockfile-types'
+import { dedupe, install } from '@pnpm/plugin-commands-installation'
+import { prepare } from '@pnpm/prepare'
+import { fixtures } from '@pnpm/test-fixtures'
+import { diff } from 'jest-diff'
+import readYamlFile from 'read-yaml-file'
+import { DEFAULT_OPTS } from './utils'
+
+const f = fixtures(__dirname)
+
+describe('pnpm dedupe', () => {
+  test('updates old resolutions from importers block and removes old packages', async () => {
+    const { originalLockfile, dedupedLockfile } = await testFixture('workspace-with-lockfile-dupes')
+    // Many old packages should be deleted as result of deduping. See snapshot file for details.
+    expect(diff(originalLockfile, dedupedLockfile, diffOptsForLockfile)).toMatchSnapshot()
+  })
+
+  test('updates old resolutions from package block', async () => {
+    const { originalLockfile, dedupedLockfile } = await testFixture('workspace-with-lockfile-subdep-dupes')
+    // This is a smaller scale test that should just update uri-js@4.2.2 to
+    // punycode@2.3.0 and remove punycode@2.1.1. See snapshot file for details.
+    expect(diff(originalLockfile, dedupedLockfile, diffOptsForLockfile)).toMatchSnapshot()
+  })
+})
+
+const noColor = (str: string) => str
+const diffOptsForLockfile = {
+  // Avoid showing common lines to make the snapshot smaller and less noisy.
+  // https://github.com/facebook/jest/tree/05deb8393c4ad71/packages/jest-diff#example-of-options-to-limit-common-lines
+  contextLines: 3,
+  expand: false,
+
+  // Remove color from snapshots
+  // https://github.com/facebook/jest/tree/05deb8393c4ad71/packages/jest-diff#example-of-options-for-no-colors
+  aColor: noColor,
+  bColor: noColor,
+  changeColor: noColor,
+  commonColor: noColor,
+  patchColor: noColor,
+}
+
+async function testFixture (fixtureName: string) {
+  const project = prepare(undefined)
+  f.copy(fixtureName, project.dir())
+
+  const { allProjects, selectedProjectsGraph } = await readProjects(project.dir(), [])
+
+  const opts = {
+    ...DEFAULT_OPTS,
+    allProjects,
+    selectedProjectsGraph,
+    recursive: true,
+    dir: project.dir(),
+    lockfileDir: project.dir(),
+    workspaceDir: project.dir(),
+  }
+
+  const readProjectLockfile = () => readYamlFile<Lockfile>(path.join(project.dir(), './pnpm-lock.yaml'))
+
+  const originalLockfile = await readProjectLockfile()
+
+  // Sanity check that this test is set up correctly by ensuring the lockfile is
+  // unmodified after a regular install.
+  await install.handler(opts)
+  expect(await readProjectLockfile()).toEqual(originalLockfile)
+
+  // The lockfile fixture has several packages that could be removed after
+  // re-resolving versions.
+  await dedupe.handler(opts)
+
+  const dedupedLockfile = await readProjectLockfile()
+
+  // It should be possible to remove packages from the fixture lockfile.
+  const originalLockfilePackageNames = Object.keys(originalLockfile.packages ?? {})
+  const dedupedLockfilePackageNames = Object.keys(dedupedLockfile.packages ?? {})
+  expect(dedupedLockfilePackageNames.length).toBeLessThan(originalLockfilePackageNames.length)
+
+  // The "pnpm dedupe" command should only remove packages when the lockfile is
+  // up to date. Ensure no new packages/dependencies were added.
+  expect(originalLockfilePackageNames).toEqual(expect.arrayContaining(dedupedLockfilePackageNames))
+
+  // Run pnpm install one last time to ensure the deduped lockfile is in a good
+  // state. If so, the "pnpm install" command should pass successfully and not
+  // make any further edits to the lockfile.
+  await install.handler(opts)
+  expect(await readProjectLockfile()).toEqual(dedupedLockfile)
+
+  return { originalLockfile, dedupedLockfile }
+}

pnpm-lock.yaml

@@ -3584,6 +3584,9 @@ importers:
       delay:
         specifier: ^5.0.0
         version: 5.0.0
+      jest-diff:
+        specifier: ^29.3.1
+        version: 29.3.1
       path-name:
         specifier: ^1.0.0
         version: 1.0.0
@@ -17550,6 +17553,7 @@ time:
   /is-subdir@1.2.0: '2021-01-05T16:52:45.485Z'
   /is-windows@1.0.2: '2018-02-14T07:36:43.207Z'
   /isexe@2.0.0: '2017-03-23T00:53:16.356Z'
+  /jest-diff@29.3.1: '2022-11-08T22:56:23.491Z'
   /jest@29.3.1: '2022-11-08T22:56:40.420Z'
   /json-append@1.1.1: '2017-01-07T04:45:27.600Z'
   /json5@2.2.3: '2022-12-31T17:11:32.047Z'

pnpm/src/cmd/index.ts

@@ -5,7 +5,7 @@ import { config, getCommand, setCommand } from '@pnpm/plugin-commands-config'
 import { doctor } from '@pnpm/plugin-commands-doctor'
 import { env } from '@pnpm/plugin-commands-env'
 import { deploy } from '@pnpm/plugin-commands-deploy'
-import { add, fetch, install, link, prune, remove, unlink, update, importCommand } from '@pnpm/plugin-commands-installation'
+import { add, dedupe, fetch, install, link, prune, remove, unlink, update, importCommand } from '@pnpm/plugin-commands-installation'
 import { list, ll, why } from '@pnpm/plugin-commands-listing'
 import { licenses } from '@pnpm/plugin-commands-licenses'
 import { outdated } from '@pnpm/plugin-commands-outdated'
@@ -101,6 +101,7 @@ const commands: CommandDefinition[] = [
   audit,
   bin,
   config,
+  dedupe,
   getCommand,
   setCommand,
   create,

pnpm/src/main.ts

@@ -168,7 +168,7 @@ export async function main (inputArgv: string[]) {
   }
 
   if (
-    (cmd === 'install' || cmd === 'import') &&
+    (cmd === 'install' || cmd === 'import' || cmd === "dedupe") &&
     typeof workspaceDir === 'string'
   ) {
     cliOptions['recursive'] = true