cache package manifests during intent discovery

Author: LadyBluenotes

packages/intent/tests/fs-cache.test.ts

@@ -0,0 +1,52 @@
+import { mkdirSync, mkdtempSync, rmSync, writeFileSync } from 'node:fs'
+import { tmpdir } from 'node:os'
+import { join } from 'node:path'
+import { afterEach, beforeEach, describe, expect, it } from 'vitest'
+import { createIntentFsCache } from '../src/fs-cache.js'
+
+let root: string
+
+beforeEach(() => {
+  root = mkdtempSync(join(tmpdir(), 'intent-fs-cache-test-'))
+})
+
+afterEach(() => {
+  rmSync(root, { recursive: true, force: true })
+})
+
+describe('createIntentFsCache', () => {
+  it('caches package.json reads', () => {
+    writeFileSync(
+      join(root, 'package.json'),
+      JSON.stringify({ name: 'test-package' }),
+    )
+    const cache = createIntentFsCache()
+
+    expect(cache.readPackageJson(root)?.name).toBe('test-package')
+    expect(cache.readPackageJson(root)?.name).toBe('test-package')
+
+    expect(cache.getStats()).toEqual(
+      expect.objectContaining({
+        packageJsonReadCount: 1,
+        packageJsonCacheHits: 1,
+      }),
+    )
+  })
+
+  it('caches skill file discovery without exposing cached arrays', () => {
+    const skillDir = join(root, 'skills', 'core')
+    mkdirSync(skillDir, { recursive: true })
+    writeFileSync(join(skillDir, 'SKILL.md'), '---\nname: core\n---\n')
+    const cache = createIntentFsCache()
+
+    const first = cache.findSkillFiles(join(root, 'skills'))
+    first.push('mutated')
+    const laterSkillDir = join(root, 'skills', 'later')
+    mkdirSync(laterSkillDir, { recursive: true })
+    writeFileSync(join(laterSkillDir, 'SKILL.md'), '---\nname: later\n---\n')
+    const second = cache.findSkillFiles(join(root, 'skills'))
+
+    expect(second).toHaveLength(1)
+    expect(second[0]).toBe(join(skillDir, 'SKILL.md'))
+  })
+})