fix: allow passing no apiKey (#8)

Author: jpoehnelt

src/index.test.ts

@@ -17,6 +17,7 @@
 import { Loader, LoaderOptions } from ".";
 
 test.each([
+  [{}, "https://maps.googleapis.com/maps/api/js?callback=__googleMapsCallback"],
   [
     { apiKey: "foo" },
     "https://maps.googleapis.com/maps/api/js?callback=__googleMapsCallback&key=foo",
@@ -114,9 +115,3 @@ test("loader should wait if already loading", () => {
 
   loader.load();
 });
-
-test("loader should throw exception if invalid key format", () => {
-  expect(() => new Loader({ apiKey: "" })).toThrow();
-  expect(() => new Loader({ apiKey: {} as string })).toThrow();
-  expect(() => new Loader({ apiKey: (1 as unknown) as string })).toThrow();
-});

src/index.ts

@@ -192,10 +192,6 @@ export class Loader {
     region,
     version,
   }: LoaderOptions) {
-    if (typeof apiKey !== "string" || !apiKey) {
-      throw "Invalid apiKey " + apiKey;
-    }
-
     this.version = version;
     this.apiKey = apiKey;
     this.libraries = libraries;
@@ -211,7 +207,10 @@ export class Loader {
     let url = this.URL;
 
     url += `?callback=${this.CALLBACK}`;
-    url += `&key=${this.apiKey}`;
+
+    if (this.apiKey) {
+      url += `&key=${this.apiKey}`;
+    }
 
     if (this.libraries.length > 0) {
       url += `&libraries=${this.libraries.join(",")}`;