DEV - versions of JS files written to a JS file to be included by loa… (#10649)

* DEV - versions of JS files written to a JS file to be included by load-script and appended as params to URLs

* Formatting

* Incorporate feedback from PR

* Update filename of public-js-versions

test/javascripts/lib/load-script-test.js

@@ -1,4 +1,5 @@
-import loadScript from "discourse/lib/load-script";
+import { loadScript, cacheBuster } from "discourse/lib/load-script";
+import { PUBLIC_JS_VERSIONS as jsVersions } from "discourse/lib/public-js-versions";
 
 QUnit.module("lib:load-script");
 
@@ -19,3 +20,28 @@ QUnit.skip(
     );
   }
 );
+
+QUnit.test("works when a value is not present", (assert) => {
+  assert.equal(
+    cacheBuster("/javascripts/my-script.js"),
+    "/javascripts/my-script.js"
+  );
+  assert.equal(
+    cacheBuster("/javascripts/my-project/script.js"),
+    "/javascripts/my-project/script.js"
+  );
+});
+
+QUnit.test(
+  "generates URLs with version number in the query params",
+  (assert) => {
+    assert.equal(
+      cacheBuster("/javascripts/pikaday.js"),
+      `/javascripts/pikaday.js?v=${jsVersions["pikaday.js"]}`
+    );
+    assert.equal(
+      cacheBuster("/javascripts/ace/ace.js"),
+      `/javascripts/ace/ace.js?v=${jsVersions["ace"]}`
+    );
+  }
+);