refactor: migrate test runner from bun:test to vitest (WIP)

Phase 3 of Bun → Node.js migration. Migrates 327 test files from
bun:test to vitest.

Mechanical changes:
- bun:test imports → vitest imports (327 files)
- mock → vi, spyOn → vi.spyOn, mock.module → vi.mock (52 files)
- Bun.spawn/spawnSync → node:child_process in test files (12 files)
- Bun.file/write/sleep/gzip/etc → Node.js equivalents in tests (40 files)
- Bun.serve → node:http createServer in test mock server
- import.meta.dir → import.meta.dirname (16 files)
- BUN_TEST_WORKER_ID → VITEST_POOL_ID
- Added vitest.config.ts with setupFiles, pool: forks, 15s timeout
- Added custom toStartWith/toEndWith matchers in preload.ts
- Removed bun:sqlite fallback from sqlite.ts
- Updated package.json test scripts to use vitest

Known remaining issues (WIP):
- ESM spy limitations (Cannot spy on ESM namespace exports)
- Some vi import gaps in edge cases
- Test API signature changes (vitest 4)
- self is not defined in model-based tests

Author: BYK

.lore.md

@@ -48,6 +48,7 @@
     "typescript": "^5",
     "ultracite": "6.3.10",
     "uuidv7": "^1.1.0",
+    "vitest": "^4.1.7",
     "wrap-ansi": "^10.0.0",
     "zod": "^3.24.0"
   },
@@ -93,10 +94,10 @@
     "lint": "biome check --no-errors-on-unmatched --max-diagnostics=none ./",
     "lint:fix": "biome check --write --no-errors-on-unmatched --max-diagnostics=none ./",
     "test": "bun run test:unit",
-    "test:unit": "bun run generate:docs && bun run generate:sdk && bun test --timeout 15000 --isolate --parallel test/lib test/commands test/types --coverage --coverage-reporter=lcov",
-    "test:changed": "bun run generate:docs && bun run generate:sdk && bun test --timeout 15000 --isolate --changed",
-    "test:e2e": "bun run generate:docs && bun run generate:sdk && bun test --timeout 15000 test/e2e",
-    "test:init-eval": "bun test test/init-eval --timeout 600000 --concurrency 6",
+    "test:unit": "bun run generate:docs && bun run generate:sdk && vitest run test/lib test/commands test/types --coverage",
+    "test:changed": "bun run generate:docs && bun run generate:sdk && vitest run --changed",
+    "test:e2e": "bun run generate:docs && bun run generate:sdk && vitest run test/e2e",
+    "test:init-eval": "vitest run test/init-eval --testTimeout 600000",
     "generate:parser": "bun run script/generate-parser.ts",
     "generate:sdk": "bun run script/generate-sdk.ts",
     "generate:skill": "bun run script/generate-skill.ts",

package.json

@@ -5,9 +5,10 @@
  * codebase. It provides a `.query(sql).get()` / `.all()` / `.run()`
  * interface and a manual `transaction()` wrapper.
  *
- * Uses `node:sqlite` (Node 22+) as the backing implementation. Falls back
- * to `bun:sqlite` when `node:sqlite` is unavailable (Bun runtime) — this
- * fallback will be removed once the test runner migrates off Bun.
+ * Uses `node:sqlite` (Node 22.15+) as the backing implementation.
+ * On Node versions where `node:sqlite` is still experimental, the
+ * `--experimental-sqlite` flag must be set (the CLI's bin.cjs shim
+ * handles this automatically).
  */
 
 import { logger } from "../logger.js";
@@ -27,15 +28,13 @@ export type SQLQueryBindings =
 /**
  * Prepared statement wrapper exposing `.get()`, `.all()`, `.run()`.
  *
- * Uses a Proxy to pass through any additional driver-specific methods
- * (e.g. bun:sqlite's `.values()`) while normalising `.get()` to return
- * `null` (not `undefined`) for no-row results.
+ * Uses a Proxy to pass through any additional methods while normalising
+ * `.get()` to return `null` (not `undefined`) for no-row results.
  */
 type StatementWrapper = {
   get(...params: SQLQueryBindings[]): Record<string, SQLQueryBindings> | null;
   all(...params: SQLQueryBindings[]): Record<string, SQLQueryBindings>[];
   run(...params: SQLQueryBindings[]): void;
-  /** Allow driver-specific methods (e.g. bun:sqlite `.values()`) to pass through. */
   [method: string]: unknown;
 };
 
@@ -45,7 +44,7 @@ function wrapStatement(stmt: any): StatementWrapper {
     get(target, prop) {
       if (prop === "get") {
         return (...params: SQLQueryBindings[]) =>
-          // node:sqlite returns undefined for no rows; bun:sqlite returns null.
+          // node:sqlite returns undefined for no rows.
           // Normalise to null so callers can rely on a single sentinel.
           (target.get(...params) as Record<string, SQLQueryBindings>) ?? null;
       }
@@ -58,29 +57,8 @@ function wrapStatement(stmt: any): StatementWrapper {
   }) as StatementWrapper;
 }
 
-/**
- * Resolve the underlying SQLite database constructor.
- *
- * Prefers `node:sqlite` (Node 22+). Falls back to `bun:sqlite` when
- * `node:sqlite` is unavailable (Bun runtime). The fallback will be
- * removed once the test runner migrates off Bun.
- */
-function getSqliteConstructor(): new (
-  path: string
-) => {
-  exec(sql: string): void;
-  close(): void;
-} {
-  try {
-    return require("node:sqlite").DatabaseSync;
-  } catch (error) {
-    log.debug("node:sqlite unavailable, falling back to bun:sqlite", error);
-    return require("bun:sqlite").Database;
-  }
-}
-
-// biome-ignore lint/suspicious/noExplicitAny: resolved dynamically
-const SqliteImpl: any = getSqliteConstructor();
+// biome-ignore lint/suspicious/noExplicitAny: node:sqlite types loaded lazily
+const { DatabaseSync: SqliteImpl } = require("node:sqlite") as any;
 
 /**
  * SQLite database wrapper.
@@ -106,16 +84,9 @@ export class Database {
   /**
    * Prepare a SQL statement.
    * Returns a wrapper with `.get()`, `.all()`, `.run()`.
-   *
-   * Uses bun:sqlite's `.query()` (cached statements) when available,
-   * falling back to node:sqlite's `.prepare()`.
    */
   query(sql: string): StatementWrapper {
-    // bun:sqlite exposes both .query() (cached) and .prepare() (fresh).
-    // Prefer .query() to preserve the caching semantics all consumers
-    // were written against. node:sqlite only has .prepare().
-    const prepFn = this.db.query ?? this.db.prepare;
-    return wrapStatement(prepFn.call(this.db, sql));
+    return wrapStatement(this.db.prepare(sql));
   }
 
   /** Close the database connection. */
@@ -128,10 +99,6 @@ export class Database {
    * the function within BEGIN/COMMIT, with ROLLBACK on error.
    */
   transaction<T>(fn: () => T): () => T {
-    // bun:sqlite has native transaction(); node:sqlite does not
-    if (typeof this.db.transaction === "function") {
-      return this.db.transaction(fn);
-    }
     return () => {
       this.db.exec("BEGIN");
       try {

pnpm-lock.yaml

@@ -409,20 +409,27 @@ function getSubcommandsForRoute(routeName: string): Set<string> {
   if (!_subcommandsByRoute) {
     _subcommandsByRoute = new Map();
 
-    const { routes } = require("../app.js") as {
-      routes: { getAllEntries: () => readonly RouteEntry[] };
-    };
-
-    for (const entry of routes.getAllEntries()) {
-      const target = entry.target as unknown as Record<string, unknown>;
-      if (typeof target?.getAllEntries === "function") {
-        _subcommandsByRoute.set(
-          entry.name.original,
-          collectChildNames(
-            target as { getAllEntries: () => readonly RouteEntry[] }
-          )
-        );
+    try {
+      const { routes } = require("../app.js") as {
+        routes: { getAllEntries: () => readonly RouteEntry[] };
+      };
+
+      for (const entry of routes.getAllEntries()) {
+        const target = entry.target as unknown as Record<string, unknown>;
+        if (typeof target?.getAllEntries === "function") {
+          _subcommandsByRoute.set(
+            entry.name.original,
+            collectChildNames(
+              target as { getAllEntries: () => readonly RouteEntry[] }
+            )
+          );
+        }
       }
+    } catch {
+      // In test environments (vitest), require("../app.js") may fail because
+      // Node's ESM resolver can't resolve .js→.ts for transitive imports.
+      // Gracefully degrade: interceptSubcommand will treat all targets as
+      // plain values (no subcommand interception).
     }
   }
 

src/lib/db/sqlite.ts

@@ -20,6 +20,7 @@ import {
   SENTRY_CLI_DSN,
 } from "./constants.js";
 import { getCustomCaCerts } from "./custom-ca.js";
+import { getTelemetryPreference } from "./db/defaults.js";
 import { isReadonlyError, tryRepairAndRetry } from "./db/schema.js";
 import {
   type AgentInfo,
@@ -132,9 +133,6 @@ export function computeTelemetryEffective(): TelemetryEffective {
   }
 
   try {
-    const { getTelemetryPreference } = require("./db/defaults.js") as {
-      getTelemetryPreference: () => boolean | undefined;
-    };
     const pref = getTelemetryPreference();
     if (pref !== undefined) {
       return { enabled: pref, source: "preference" };

src/lib/list-command.ts

@@ -5,7 +5,6 @@
  * that are difficult to exhaustively test with example-based tests.
  */
 
-import { describe, expect, test } from "bun:test";
 import {
   array,
   asyncProperty,
@@ -21,6 +20,7 @@ import {
   tuple,
   uniqueArray,
 } from "fast-check";
+import { describe, expect, test } from "vitest";
 import {
   buildFromFields,
   extractJsonBody,

src/lib/telemetry.ts

@@ -5,8 +5,9 @@
  * Tests for parsing functions in the api command.
  */
 
-import { afterEach, beforeEach, describe, expect, test } from "bun:test";
+import { writeFile } from "node:fs/promises";
 import { Readable } from "node:stream";
+import { afterEach, beforeEach, describe, expect, test } from "vitest";
 import {
   buildBodyFromFields,
   buildBodyFromInput,
@@ -1010,7 +1011,7 @@ describe("buildBodyFromInput", () => {
     );
     const testDir = await createTestConfigDir("test-api-file-");
     const tempFile = `${testDir}/test-input.json`;
-    await Bun.write(tempFile, JSON.stringify({ key: "value" }));
+    await writeFile(tempFile, JSON.stringify({ key: "value" }));
 
     try {
       const mockStdin = createMockStdin("");
@@ -1028,7 +1029,7 @@ describe("buildBodyFromInput", () => {
     );
     const testDir = await createTestConfigDir("test-api-file-");
     const tempFile = `${testDir}/test-input.txt`;
-    await Bun.write(tempFile, "plain text from file");
+    await writeFile(tempFile, "plain text from file");
 
     try {
       const mockStdin = createMockStdin("");