chore: add test type declarations

src/types/test-globals.d.ts

@@ -0,0 +1,24 @@
+declare global {
+  const describe: (name: string, fn: () => void) => void
+  const test: (name: string, fn: () => void | Promise<void>) => void
+  const beforeEach: (fn: () => void | Promise<void>) => void
+  const afterEach: (fn: () => void | Promise<void>) => void
+  const expect: (value: unknown) => {
+    toBe: (expected: unknown) => void
+    toContain: (expected: unknown) => void
+    not: {
+      toBe: (expected: unknown) => void
+      toContain: (expected: unknown) => void
+    }
+  }
+  const spyOn: <T extends object, K extends keyof T>(
+    target: T,
+    key: K
+  ) => {
+    mockReturnValue: (value: T[K]) => void
+    mockImplementation: (impl: T[K]) => void
+    mockRestore: () => void
+  }
+}
+
+export {}