fix: installing in single project of a workspace

close #4073

packages/core/test/hoistedNodeLinker/install.ts

@@ -1,6 +1,6 @@
 import fs from 'fs'
 import path from 'path'
-import { addDependenciesToPackage, install } from '@pnpm/core'
+import { addDependenciesToPackage, install, mutateModules } from '@pnpm/core'
 import { prepareEmpty } from '@pnpm/prepare'
 import { sync as loadJsonFile } from 'load-json-file'
 import { addDistTag, testDefaults } from '../utils'
@@ -66,3 +66,46 @@ test('preserve subdeps on update', async () => {
   expect(loadJsonFile<{ version: string }>('node_modules/foobarqar/package.json').version).toBe('1.0.1')
   expect(loadJsonFile<{ version: string }>('node_modules/foobarqar/node_modules/bar/package.json').version).toBe('100.0.0')
 })
+
+test('adding a new dependency to one of the the workspace projects', async () => {
+  prepareEmpty()
+
+  let [{ manifest }] = await mutateModules([
+    {
+      buildIndex: 0,
+      manifest: {
+        name: 'project-1',
+        version: '1.0.0',
+
+        dependencies: {
+          bar: '100.0.0',
+        },
+      },
+      mutation: 'install',
+      rootDir: path.resolve('project-1'),
+    },
+    {
+      buildIndex: 1,
+      manifest: {
+        name: 'project-2',
+        version: '1.0.0',
+
+        dependencies: {
+          foobarqar: '1.0.0',
+        },
+      },
+      mutation: 'install',
+      rootDir: path.resolve('project-2'),
+    },
+  ], await testDefaults({ nodeLinker: 'hoisted' }))
+  manifest = await addDependenciesToPackage(
+    manifest,
+    ['is-negative@1.0.0'],
+    await testDefaults({ nodeLinker: 'hoisted', prefix: path.resolve('project-1'), targetDependenciesField: 'devDependencies' })
+  )
+
+  expect(manifest.dependencies).toStrictEqual({ bar: '100.0.0' })
+  expect(manifest.devDependencies).toStrictEqual({ 'is-negative': '1.0.0' })
+  expect(loadJsonFile<{ version: string }>('node_modules/bar/package.json').version).toBe('100.0.0')
+  expect(loadJsonFile<{ version: string }>('node_modules/is-negative/package.json').version).toBe('1.0.0')
+})

packages/headless/src/index.ts

@@ -217,7 +217,7 @@ export default async (opts: HeadlessOptions) => {
     registries: opts.registries,
     skipped,
   }
-  const importerIds = opts.ignorePackageManifest
+  const importerIds = (opts.ignorePackageManifest === true || opts.nodeLinker === 'hoisted')
     ? Object.keys(wantedLockfile.importers)
     : opts.projects.map(({ id }) => id)
   const filteredLockfile = filterLockfileByImportersAndEngine(wantedLockfile, importerIds, {