refactor: create helpers.ts & add Cookie

test/helpers.ts

@@ -0,0 +1,14 @@
+// Borrowed from playwright
+export interface Cookie {
+  name: string
+  value: string
+  domain: string
+  path: string
+  /**
+   * Unix time in seconds.
+   */
+  expires: number
+  httpOnly: boolean
+  secure: boolean
+  sameSite: "Strict" | "Lax" | "None"
+}