fix(deps): switch package manager to bun, use bun's native test runner

.bun-version

@@ -0,0 +1 @@
+1.3.14

.github/workflows/ci.yml

@@ -8,10 +8,9 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v7
-      - uses: actions/setup-node@v7
+      - uses: oven-sh/setup-bun@v2
         with:
-          cache: yarn
-          node-version-file: ".nvmrc"
-      - run: yarn install
-      - run: yarn build
-      - run: yarn test
+          bun-version-file: ".bun-version"
+      - run: bun install
+      - run: bun run build
+      - run: bun test

.github/workflows/example.yml

@@ -21,12 +21,11 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v7
-      - uses: actions/setup-node@v7
+      - uses: oven-sh/setup-bun@v2
         with:
-          cache: yarn
-          node-version-file: ".nvmrc"
-      - run: yarn install
-      - run: yarn build
+          bun-version-file: ".bun-version"
+      - run: bun install
+      - run: bun run build
       - uses: actions/upload-artifact@v7
         with:
           name: dist

.github/workflows/release.yml

@@ -21,6 +21,10 @@ jobs:
           app-id: ${{ vars.FRECKLE_AUTOMATION_APP_ID }}
           private-key: ${{ secrets.FRECKLE_AUTOMATION_PRIVATE_KEY }}
 
+      - uses: oven-sh/setup-bun@v2
+        with:
+          bun-version-file: ".bun-version"
+
       - uses: cycjimmy/semantic-release-action@v6.0.0
         with:
           extra_plugins: |

.releaserc.yaml

@@ -10,7 +10,7 @@ plugins:
 
   # Update dist, in case Dependabot PRs merged without doing so
   - - "@semantic-release/exec"
-    - prepareCmd: "yarn install && yarn run build"
+    - prepareCmd: "bun install && bun run build"
 
   - - "@semantic-release/git"
     - assets: "dist/index.js"

package.json

@@ -8,7 +8,7 @@
     "build": "tsc && ncc build lib/main.js && sed -i 's/\\x0D$//' ./dist/index.js",
     "format": "prettier --write \"**/*.ts\"",
     "format-check": "prettier --check \"**/*.ts\"",
-    "test": "NODE_OPTIONS='--experimental-vm-modules' jest",
+    "test": "bun test",
     "readme": "npx action-docs -u && prettier --write README.md"
   },
   "repository": {
@@ -26,14 +26,12 @@
     "shellwords-ts": "^3.0.1"
   },
   "devDependencies": {
-    "@types/jest": "^30.0.0",
+    "@types/bun": "^1.3.14",
     "@types/js-yaml": "^4.0.9",
     "@types/node": "^24.13.3",
     "@vercel/ncc": "^0.44.1",
     "action-docs": "^2.5.1",
-    "jest": "^30.4.2",
     "prettier": "^3.9.6",
-    "ts-jest": "^29.4.12",
     "ts-node": "^10.9.2",
     "typescript": "^7.0.2"
   }

src/dirty-files.test.ts

@@ -1,4 +1,4 @@
-import { jest } from "@jest/globals";
+import { describe, expect, test } from "bun:test";
 
 import { parseGitStatus, isInterestingFile } from "./dirty-files.js";
 

src/envsubst.test.ts

@@ -1,4 +1,4 @@
-import { jest } from "@jest/globals";
+import { describe, expect, test } from "bun:test";
 
 import { envsubst } from "./envsubst.js";
 

src/get-cache-keys.test.ts

@@ -1,4 +1,4 @@
-import { jest } from "@jest/globals";
+import { expect, test } from "bun:test";
 
 import { getCacheKeys } from "./get-cache-keys.js";
 

src/parse-stack-path.test.ts

@@ -1,4 +1,4 @@
-import { jest } from "@jest/globals";
+import { expect, test } from "bun:test";
 
 import { parseStackPath } from "./parse-stack-path.js";
 

src/parse-stack-query.test.ts

@@ -1,4 +1,4 @@
-import { jest } from "@jest/globals";
+import { expect, test } from "bun:test";
 
 import { parseStackQuery } from "./parse-stack-query.js";
 

src/stack-cli.test.ts

@@ -1,14 +1,18 @@
 import { ExecOptions } from "@actions/exec";
-import { jest } from "@jest/globals";
+import { beforeEach, describe, expect, mock, test } from "bun:test";
 
 import { ExecDelegate, StackCLI } from "./stack-cli.js";
 
 const exec: ExecDelegate = {
-  exec: jest.fn((command: string, args: string[], options?: ExecOptions) =>
+  exec: mock((command: string, args: string[], options?: ExecOptions) =>
     Promise.resolve(0),
   ),
 };
 
+beforeEach(() => {
+  mock.clearAllMocks();
+});
+
 describe("StackCLI", () => {
   test("Respects --resolver given", async () => {
     const stackCLI = new StackCLI(["--resolver", "lts"], false, exec);

src/stack-yaml.test.ts

@@ -1,4 +1,4 @@
-import { jest } from "@jest/globals";
+import { describe, expect, jest, test } from "bun:test";
 
 import { parseStackYaml, getStackDirectories } from "./stack-yaml.js";
 import { StackCLI } from "./stack-cli.js";

src/with-cache.test.ts

@@ -1,5 +1,5 @@
 import * as core from "@actions/core";
-import { jest } from "@jest/globals";
+import { beforeEach, expect, mock, spyOn, test } from "bun:test";
 
 import { getCacheKeys } from "./get-cache-keys.js";
 import {
@@ -9,11 +9,15 @@ import {
 } from "./with-cache.js";
 
 const cache: CacheDelegate = {
-  restoreCache: jest.fn(() => Promise.resolve("")),
-  saveCache: jest.fn(() => Promise.resolve(0)),
+  restoreCache: mock(() => Promise.resolve("")),
+  saveCache: mock(() => Promise.resolve(0)),
 };
 
-const restoreCacheMock = jest.spyOn(cache, "restoreCache");
+const restoreCacheMock = spyOn(cache, "restoreCache");
+
+beforeEach(() => {
+  mock.clearAllMocks();
+});
 
 async function testFunction(): Promise<number> {
   return 42;
@@ -119,15 +123,15 @@ test("withCache does not save on error", async () => {
   const cacheKeys = getCacheKeys(["a-b", "c", "d"]);
   restoreCacheMock.mockImplementation(simulateCacheMiss);
 
-  await expect(async () => {
-    await withCache(
+  await expect(
+    withCache(
       cachePaths,
       cacheKeys,
       testFunctionThrows,
       { ...DEFAULT_CACHE_OPTIONS, silent: true },
       cache,
-    );
-  }).rejects.toThrow();
+    ),
+  ).rejects.toThrow();
 
   expect(cache.restoreCache).toHaveBeenCalledWith(
     cachePaths,
@@ -144,8 +148,8 @@ test("withCache can be configured to save on error", async () => {
   const cacheKeys = getCacheKeys(["a-b", "c", "d"]);
   restoreCacheMock.mockImplementation(simulateCacheMiss);
 
-  await expect(async () => {
-    await withCache(
+  await expect(
+    withCache(
       cachePaths,
       cacheKeys,
       testFunctionThrows,
@@ -155,8 +159,8 @@ test("withCache can be configured to save on error", async () => {
         silent: true,
       },
       cache,
-    );
-  }).rejects.toThrow();
+    ),
+  ).rejects.toThrow();
 
   expect(cache.restoreCache).toHaveBeenCalledWith(
     cachePaths,