fix(pagination): always return undfined when there's no link

Author: DASPRiD

src/pagination.ts

@@ -3,11 +3,9 @@ import type { Link } from "./standard-schemas.ts";
 const pageParamRegexp = /^page\[([a-zA-Z0-9]+)]$/;
 export type PageParams = Record<string, string>;
 
-export const parsePageParamsFromLink = (
-    link: Link | undefined | null,
-): PageParams | undefined | null => {
+export const parsePageParamsFromLink = (link: Link | undefined | null): PageParams | undefined => {
     if (link === undefined || link === null) {
-        return link;
+        return undefined;
     }
 
     const url = new URL(typeof link === "string" ? link : link.href, "http://localhost");

test/pagination.test.ts

@@ -2,9 +2,9 @@ import { describe, expect, it } from "vitest";
 import { injectPageParams, parsePageParamsFromLink } from "../src/index.js";
 
 describe("parsePageParams", () => {
-    it("should return falsy link", () => {
+    it("should return undefined on falsy link", () => {
         expect(parsePageParamsFromLink(undefined)).toBeUndefined();
-        expect(parsePageParamsFromLink(null)).toBeNull();
+        expect(parsePageParamsFromLink(null)).toBeUndefined();
     });
 
     it("should throw when not finding page params", () => {