fix(build): derive clean outputs from project graph

scripts/clean.spec.ts

@@ -0,0 +1,62 @@
+import { existsSync, mkdirSync, mkdtempSync, rmSync, writeFileSync } from 'node:fs'
+import { tmpdir } from 'node:os'
+import { dirname, join } from 'node:path'
+import { afterEach, describe, expect, it } from 'vitest'
+
+import { RepositoryCleaner } from './clean.ts'
+
+const roots: string[] = []
+
+function fixture(): string {
+  const root = mkdtempSync(join(tmpdir(), 'dsh-clean-'))
+  roots.push(root)
+  return root
+}
+
+function write(path: string, content = ''): void {
+  mkdirSync(dirname(path), { recursive: true })
+  writeFileSync(path, content)
+}
+
+function addProject(root: string, path: string): void {
+  write(join(root, 'tsconfig.json'), JSON.stringify({ files: [], references: [{ path }] }))
+  write(join(root, path, 'tsconfig.json'), JSON.stringify({
+    compilerOptions: { composite: true, outDir: 'lib/types' },
+    include: ['src'],
+  }))
+  write(join(root, path, 'src/index.ts'), 'export {}\n')
+}
+
+afterEach(() => {
+  for (const root of roots.splice(0)) rmSync(root, { recursive: true, force: true })
+})
+
+describe('RepositoryCleaner', () => {
+  it('derives live build outputs from project references and removes safe stale package residue', async () => {
+    const root = fixture()
+    addProject(root, 'products/shell')
+    write(join(root, 'products/shell/lib/types/index.js'))
+    write(join(root, 'products/shell/lib/index.js'))
+    write(join(root, '.typecheck/legacy.tsbuildinfo'))
+    write(join(root, 'root.tsbuildinfo'))
+    write(join(root, 'packages/removed/ghost/node_modules/.bin/tool'))
+
+    await new RepositoryCleaner(root).clean()
+
+    expect(existsSync(join(root, 'products/shell/lib'))).toBe(false)
+    expect(existsSync(join(root, 'products/shell/src/index.ts'))).toBe(true)
+    expect(existsSync(join(root, '.typecheck'))).toBe(false)
+    expect(existsSync(join(root, 'root.tsbuildinfo'))).toBe(false)
+    expect(existsSync(join(root, 'packages/removed/ghost'))).toBe(false)
+  })
+
+  it('does not delete any target when a manifest-less package contains an unknown file', async () => {
+    const root = fixture()
+    addProject(root, 'products/shell')
+    write(join(root, 'products/shell/lib/types/index.js'))
+    write(join(root, 'packages/removed/ghost/notes.txt'))
+
+    await expect(new RepositoryCleaner(root).clean()).rejects.toThrow('packages/removed/ghost/notes.txt')
+    expect(existsSync(join(root, 'products/shell/lib'))).toBe(true)
+  })
+})