test: update to vitest 4 to use builtin bun support

configs/vite.config.base.ts

@@ -1,5 +1,5 @@
 import {visualizer} from "rollup-plugin-visualizer";
-import {UserConfig, defineConfig} from "vite";
+import {defineConfig} from "vite";
 import {nodePolyfills} from "vite-plugin-node-polyfills";
 import topLevelAwait from "vite-plugin-top-level-await";
 import {blsBrowserPlugin} from "../scripts/vite/plugins/blsBrowserPlugin.js";

configs/vitest.config.e2e.ts

@@ -17,11 +17,8 @@ export const e2eMinimalProject = defineProject({
       LODESTAR_PRESET: "minimal",
     },
     pool: "forks",
-    poolOptions: {
-      forks: {
-        singleFork: true,
-      },
-    },
+    maxWorkers: 1,
+    isolate: false,
     sequence: {
       concurrent: false,
       shuffle: false,
@@ -43,11 +40,8 @@ export const e2eMainnetProject = defineProject({
       LODESTAR_PRESET: "mainnet",
     },
     pool: "forks",
-    poolOptions: {
-      forks: {
-        singleFork: true,
-      },
-    },
+    maxWorkers: 1,
+    isolate: false,
     sequence: {
       concurrent: false,
       shuffle: false,

configs/vitest.config.unit.ts

@@ -7,19 +7,12 @@ const setupFiles = [
   path.join(import.meta.dirname, "../scripts/vitest/setupFiles/lodestarPreset.ts"),
 ];
 
-const isBun = "bun" in process.versions;
-
 export const unitTestMinimalProject = defineProject({
   test: {
     name: "unit-minimal",
     include: ["**/test/unit-minimal/**/*.test.ts"],
     setupFiles,
-    // Current vitest `forks` pool is not yet supported with Bun
-    // so we conditionally switch to our custom pool which run tests in main process
-    pool: isBun ? "vitest-in-process-pool" : "forks",
-    poolOptions: {
-      forks: isBun ? {singleFork: true} : {},
-    },
+    pool: "forks",
     env: {
       LODESTAR_PRESET: "minimal",
     },
@@ -39,12 +32,7 @@ export const unitTestMainnetProject = defineProject({
     // for now I tried to identify such tests an increase the limit a bit higher
     testTimeout: 20_000,
     hookTimeout: 20_000,
-    // Current vitest `forks` pool is not yet supported with Bun
-    // so we conditionally switch to our custom pool which run tests in main process
-    pool: isBun ? "vitest-in-process-pool" : "forks",
-    poolOptions: {
-      forks: isBun ? {singleFork: true} : {},
-    },
+    pool: "forks",
     env: {
       LODESTAR_PRESET: "mainnet",
     },

package.json

@@ -47,8 +47,8 @@
     "@chainsafe/biomejs-config": "^1.0.0",
     "@types/node": "^22.18.6",
     "@types/react": "^19.1.12",
-    "@vitest/browser": "3.0.9",
-    "@vitest/coverage-v8": "3.0.9",
+    "@vitest/browser": "^4.0.6",
+    "@vitest/coverage-v8": "^4.0.6",
     "bun-types": "^1.2.21",
     "crypto-browserify": "^3.12.0",
     "dotenv": "^16.4.5",
@@ -70,20 +70,18 @@
     "typescript": "^5.9.2",
     "typescript-docs-verifier": "^3.0.1",
     "vite": "^6.0.11",
-    "vite-plugin-dts": "^4.5.0",
-    "vite-plugin-node-polyfills": "^0.23.0",
-    "vite-plugin-top-level-await": "^1.5.0",
-    "vitest": "3.0.9",
-    "vitest-in-process-pool": "2.0.1",
-    "vitest-when": "^0.6.1",
+    "vite-plugin-dts": "^4.5.4",
+    "vite-plugin-node-polyfills": "^0.24.0",
+    "vite-plugin-top-level-await": "^1.6.0",
+    "vitest": "^4.0.6",
+    "vitest-when": "^0.9.0",
     "wait-port": "^1.1.0",
-    "webdriverio": "^9.7.2"
+    "webdriverio": "^9.20.0"
   },
   "resolutions": {
     "dns-over-http-resolver": "^2.1.1",
     "loupe": "^2.3.6",
     "testcontainers/**/nan": "^2.19.0",
-    "vitest": "3.0.9",
     "elliptic": ">=6.6.1"
   }
 }

packages/beacon-node/test/mocks/mockedBeaconChain.ts

@@ -3,6 +3,7 @@ import {PubkeyIndexMap} from "@chainsafe/pubkey-index-map";
 import {ChainForkConfig} from "@lodestar/config";
 import {config as defaultConfig} from "@lodestar/config/default";
 import {EpochDifference, ForkChoice, ProtoBlock} from "@lodestar/fork-choice";
+import {CachedBeaconStateAllForks} from "@lodestar/state-transition";
 import {Logger} from "@lodestar/utils";
 import {BeaconProposerCache} from "../../src/chain/beaconProposerCache.js";
 import {BeaconChain} from "../../src/chain/chain.js";
@@ -20,7 +21,7 @@ import {getMockedLogger} from "./loggerMock.js";
 
 export type MockedBeaconChain = Mocked<BeaconChain> & {
   logger: Mocked<Logger>;
-  getHeadState: Mock;
+  getHeadState: Mocked<CachedBeaconStateAllForks>;
   forkChoice: MockedForkChoice;
   executionEngine: Mocked<ExecutionEngineHttp>;
   executionBuilder: Mocked<ExecutionBuilderHttp>;

packages/beacon-node/test/unit/chain/validation/voluntaryExit.test.ts

@@ -66,7 +66,7 @@ describe("validate voluntary exit", () => {
     vi.spyOn(chainStub, "getHeadStateAtCurrentEpoch").mockResolvedValue(state);
     vi.spyOn(opPool, "hasSeenBlsToExecutionChange");
     vi.spyOn(opPool, "hasSeenVoluntaryExit");
-    vi.spyOn(chainStub.bls, "verifySignatureSets").mockResolvedValue(true);
+    chainStub.bls.verifySignatureSets.mockResolvedValue(true);
   });
 
   afterEach(() => {
@@ -165,7 +165,7 @@ describe("validate voluntary exit", () => {
 
     opPool.hasSeenVoluntaryExit.mockReturnValue(false);
 
-    vi.spyOn(chainStub.bls, "verifySignatureSets").mockResolvedValue(false);
+    chainStub.bls.verifySignatureSets.mockResolvedValue(false);
 
     await expectRejectedWithLodestarError(
       validateGossipVoluntaryExit(chainStub, signedVoluntaryExitInvalidSig),

packages/beacon-node/test/unit/sync/unknownBlock.test.ts

@@ -27,6 +27,8 @@ import {getRandPeerIdStr, getRandPeerSyncMeta} from "../../utils/peer.js";
 
 describe.skip(
   "sync by UnknownBlockSync",
+  // spacer comment to avoid unnecessary changes in git
+  {timeout: 20_000},
   () => {
     const logger = testLogger();
     const slotSec = 0.3;
@@ -258,8 +260,7 @@ describe.skip(
         syncService.close();
       });
     }
-  },
-  {timeout: 20_000}
+  }
 );
 
 describe("UnknownBlockSync", () => {

packages/spec-test-util/package.json

@@ -57,9 +57,9 @@
     "@lodestar/utils": "^1.35.0",
     "rimraf": "^4.4.1",
     "snappyjs": "^0.7.0",
-    "vitest": "3.0.9"
+    "vitest": "^4.0.6"
   },
   "peerDependencies": {
-    "vitest": "3.0.9"
+    "vitest": "^4.0.6"
   }
 }

packages/test-utils/package.json

@@ -57,12 +57,12 @@
     "axios": "^1.3.4",
     "testcontainers": "^10.2.1",
     "tmp": "^0.2.1",
-    "vitest": "3.0.9"
+    "vitest": "^4.0.6"
   },
   "devDependencies": {
     "@types/yargs": "^17.0.24"
   },
   "peerDependencies": {
-    "vitest": "3.0.9"
+    "vitest": "^4.0.6"
   }
 }

vitest.config.ts

@@ -1,15 +1,12 @@
 import path from "node:path";
-import {ViteUserConfig, defineConfig} from "vitest/config";
+import {TestUserConfig, defineConfig} from "vitest/config";
 import {browserTestProject} from "./configs/vitest.config.browser.js";
 import {e2eMainnetProject, e2eMinimalProject} from "./configs/vitest.config.e2e.js";
 import {specProjectMainnet, specProjectMinimal} from "./configs/vitest.config.spec.js";
 import {typesTestProject} from "./configs/vitest.config.types.js";
 import {unitTestMainnetProject, unitTestMinimalProject} from "./configs/vitest.config.unit.js";
 
-const isBun = "bun" in process.versions;
-
-export function getReporters(): ViteUserConfig["test"]["reporters"] {
-  if (isBun) return [["default", {summary: false}]];
+export function getReporters(): TestUserConfig["reporters"] {
   if (process.env.GITHUB_ACTIONS) return ["verbose", "hanging-process", "github-actions"];
   if (process.env.TEST_COMPACT_OUTPUT) return ["basic", "hanging-process"];
 
@@ -18,7 +15,7 @@ export function getReporters(): ViteUserConfig["test"]["reporters"] {
 
 export default defineConfig({
   test: {
-    workspace: [
+    projects: [
       {
         extends: true,
         ...unitTestMinimalProject,
@@ -77,9 +74,8 @@ export default defineConfig({
     onConsoleLog: () => !process.env.TEST_QUIET_CONSOLE,
     coverage: {
       enabled: false,
+      include: ["packages/**/src/**.{ts}"],
       clean: true,
-      all: false,
-      extension: [".ts"],
       provider: "v8",
       reporter: [["lcovonly", {file: "lcov.info"}], ["text"]],
       reportsDirectory: "./coverage",