Revert 2b7c0bb and instead add a ts-ignore statement

Adds back the existing error message that was removed

src/sign/index.ts

@@ -1,6 +1,11 @@
 import { createHmac } from "crypto";
 
 export function sign(secret: string, payload: string | object): string {
+  // @ts-ignore throw friendly error message when required options are missing
+  if (!secret || !payload) {
+    throw new TypeError("secret & payload required");
+  }
+
   payload =
     typeof payload === "string" ? payload : toNormalizedJsonString(payload);
   return "sha1=" + createHmac("sha1", secret).update(payload).digest("hex");