Add new test for UrlSearchParams.

tests/cases/compiler/typesForUrlSearchParams01.ts

@@ -0,0 +1,34 @@
+// @strict: true
+// @lib: dom,esnext
+
+export const carQuery = new URLSearchParams([
+    ["query", "suv"],
+    ["new", true],
+    ["accidents", false],
+    ["miles", 42_000],
+]);
+
+carQuery.set("used", true);
+carQuery.append("year", 2023);
+carQuery.append("year", 2024);
+
+let str: string | null, strs: string[];
+
+str = carQuery.get("query");
+strs = carQuery.getAll("year");
+
+for (const [key, value] of carQuery) {
+    str = key;
+    str = value;
+}
+for (const [key, value] of carQuery.entries()) {
+    str = key;
+    str = value;
+}
+for (const value of carQuery.values()) {
+    str = value;
+}
+carQuery.forEach((value, key) => {
+    str = key;
+    str = value;
+});