fix: use jsonc-parser for safe JSONC migration and add project-local config detection

bun-test.d.ts

@@ -1,18 +1,41 @@
 declare module "bun:test" {
+  interface MockMetadata<TArgs extends unknown[]> {
+    calls: TArgs[]
+  }
+
+  interface MockFunction<TArgs extends unknown[] = unknown[], TReturn = unknown> {
+    (...args: TArgs): TReturn
+    mock: MockMetadata<TArgs>
+    mockReset(): void
+    mockReturnValue(value: TReturn): void
+    mockResolvedValue(value: Awaited<TReturn>): void
+  }
+
   export function describe(name: string, fn: () => void): void
   export function it(name: string, fn: () => void | Promise<void>): void
   export function beforeEach(fn: () => void | Promise<void>): void
   export function afterEach(fn: () => void | Promise<void>): void
   export function beforeAll(fn: () => void | Promise<void>): void
   export function afterAll(fn: () => void | Promise<void>): void
-  export function mock<T extends (...args: never[]) => unknown>(fn: T): T
+  export function mock<TArgs extends unknown[], TReturn>(
+    fn: (...args: TArgs) => TReturn,
+  ): MockFunction<TArgs, TReturn>
+
+  export namespace mock {
+    function module(modulePath: string, factory: () => Record<string, unknown>): void
+    function restore(): void
+  }
 
   interface Matchers {
     toBe(expected: unknown): void
+    toBeNull(): void
     toEqual(expected: unknown): void
     toContain(expected: unknown): void
     toMatch(expected: RegExp | string): void
     toHaveLength(expected: number): void
+    toHaveBeenCalled(): void
+    toHaveBeenCalledTimes(expected: number): void
+    toHaveBeenCalledWith(...expected: unknown[]): void
     toBeGreaterThan(expected: number): void
     toThrow(expected?: RegExp | string): void
     toStartWith(expected: string): void