feat: add bun dependency cache support (#42)

## Summary
- Add `bun.lockb` and `bun.lock` lock file detection for dependency
caching
- Add `Bun` variant to `LockFileType` enum and wire it through cache
directory resolution
- Add `test-cache-bun` CI job to verify bun caching in GitHub Actions

VP supports bun as a package manager since v0.1.15 — this aligns the
action with that support.

Closes #41

## Test plan
- [x] Unit tests pass (`vp run test` — 92 tests)
- [x] Lint/format clean (`vp run check:fix`)
- [x] Build up to date (`vp run build`)
- [x] CI `test-cache-bun` job passes on PR

Author: fengmk2

.github/workflows/test.yml

@@ -151,6 +151,38 @@ jobs:
           echo "Installed version: ${{ steps.setup.outputs.version }}"
           echo "Cache hit: ${{ steps.setup.outputs.cache-hit }}"
 
+  test-cache-bun:
+    strategy:
+      fail-fast: false
+      matrix:
+        version: [latest, alpha]
+        lockfile: [bun.lock, bun.lockb]
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6
+
+      - name: Create test project with ${{ matrix.lockfile }}
+        run: |
+          mkdir -p test-project
+          cd test-project
+          echo '{"name":"test-project","private":true}' > package.json
+          touch ${{ matrix.lockfile }}
+
+      - name: Setup Vite+ (${{ matrix.version }}) with bun cache (${{ matrix.lockfile }})
+        uses: ./
+        id: setup
+        with:
+          version: ${{ matrix.version }}
+          run-install: false
+          cache: true
+          cache-dependency-path: test-project/${{ matrix.lockfile }}
+
+      - name: Verify installation
+        run: |
+          vp --version
+          echo "Installed version: ${{ steps.setup.outputs.version }}"
+          echo "Cache hit: ${{ steps.setup.outputs.cache-hit }}"
+
   test-vp-exec:
     strategy:
       fail-fast: false

dist/index.mjs

@@ -34,6 +34,7 @@ export enum LockFileType {
   Npm = "npm",
   Pnpm = "pnpm",
   Yarn = "yarn",
+  Bun = "bun",
 }
 
 export interface LockFileInfo {

src/types.ts

@@ -81,6 +81,30 @@ describe("detectLockFile", () => {
       });
     });
 
+    it("should return lock file info for bun.lockb", () => {
+      vi.mocked(existsSync).mockReturnValue(true);
+
+      const result = detectLockFile("bun.lockb");
+
+      expect(result).toEqual({
+        type: LockFileType.Bun,
+        path: join(mockWorkspace, "bun.lockb"),
+        filename: "bun.lockb",
+      });
+    });
+
+    it("should return lock file info for bun.lock", () => {
+      vi.mocked(existsSync).mockReturnValue(true);
+
+      const result = detectLockFile("bun.lock");
+
+      expect(result).toEqual({
+        type: LockFileType.Bun,
+        path: join(mockWorkspace, "bun.lock"),
+        filename: "bun.lock",
+      });
+    });
+
     it("should return undefined if explicit file does not exist", () => {
       vi.mocked(existsSync).mockReturnValue(false);
 
@@ -176,6 +200,63 @@ describe("detectLockFile", () => {
       });
     });
 
+    it("should detect bun.lockb", () => {
+      vi.mocked(readdirSync).mockReturnValue(["bun.lockb"] as unknown as ReturnType<
+        typeof readdirSync
+      >);
+
+      const result = detectLockFile();
+
+      expect(result).toEqual({
+        type: LockFileType.Bun,
+        path: join(mockWorkspace, "bun.lockb"),
+        filename: "bun.lockb",
+      });
+    });
+
+    it("should detect bun.lock when bun.lockb is absent", () => {
+      vi.mocked(readdirSync).mockReturnValue(["bun.lock"] as unknown as ReturnType<
+        typeof readdirSync
+      >);
+
+      const result = detectLockFile();
+
+      expect(result).toEqual({
+        type: LockFileType.Bun,
+        path: join(mockWorkspace, "bun.lock"),
+        filename: "bun.lock",
+      });
+    });
+
+    it("should prioritize bun.lockb over bun.lock", () => {
+      vi.mocked(readdirSync).mockReturnValue(["bun.lock", "bun.lockb"] as unknown as ReturnType<
+        typeof readdirSync
+      >);
+
+      const result = detectLockFile();
+
+      expect(result).toEqual({
+        type: LockFileType.Bun,
+        path: join(mockWorkspace, "bun.lockb"),
+        filename: "bun.lockb",
+      });
+    });
+
+    it("should prioritize pnpm-lock.yaml over bun lock files", () => {
+      vi.mocked(readdirSync).mockReturnValue([
+        "bun.lockb",
+        "pnpm-lock.yaml",
+      ] as unknown as ReturnType<typeof readdirSync>);
+
+      const result = detectLockFile();
+
+      expect(result).toEqual({
+        type: LockFileType.Pnpm,
+        path: join(mockWorkspace, "pnpm-lock.yaml"),
+        filename: "pnpm-lock.yaml",
+      });
+    });
+
     it("should return undefined when no lock files found", () => {
       vi.mocked(readdirSync).mockReturnValue([
         "package.json",
@@ -336,6 +417,19 @@ describe("getCacheDirectories", () => {
       }),
     );
   });
+
+  it("should run vp pm cache dir for bun", async () => {
+    vi.mocked(getExecOutput).mockResolvedValue({
+      exitCode: 0,
+      stdout: "/tmp/bun-cache\n",
+      stderr: "",
+    });
+
+    const cacheCwd = join("/test", "workspace", "web");
+    const result = await getCacheDirectories(LockFileType.Bun, cacheCwd);
+
+    expect(result).toEqual(["/tmp/bun-cache"]);
+  });
 });
 
 describe("getInstallCwd", () => {

src/utils.test.ts

@@ -49,6 +49,8 @@ export function getInstallCwd(projectDir: string, cwd?: string): string {
 // Lock file patterns in priority order
 const LOCK_FILES: Array<{ filename: string; type: LockFileType }> = [
   { filename: "pnpm-lock.yaml", type: LockFileType.Pnpm },
+  { filename: "bun.lockb", type: LockFileType.Bun },
+  { filename: "bun.lock", type: LockFileType.Bun },
   { filename: "package-lock.json", type: LockFileType.Npm },
   { filename: "npm-shrinkwrap.json", type: LockFileType.Npm },
   { filename: "yarn.lock", type: LockFileType.Yarn },
@@ -108,6 +110,9 @@ function inferLockFileType(fullPath: string, filename: string): LockFileInfo {
   if (filename.includes("yarn")) {
     return { type: LockFileType.Yarn, path: fullPath, filename };
   }
+  if (filename.startsWith("bun.")) {
+    return { type: LockFileType.Bun, path: fullPath, filename };
+  }
   // Default to npm
   return { type: LockFileType.Npm, path: fullPath, filename };
 }
@@ -120,6 +125,7 @@ export async function getCacheDirectories(lockType: LockFileType, cwd: string):
     case LockFileType.Npm:
     case LockFileType.Pnpm:
     case LockFileType.Yarn:
+    case LockFileType.Bun:
       return getViteCacheDir(cwd);
     default:
       return [];