Improve documentation and simplify the property types in Callbacks/ru…

…n.ts

app/javascript/common/Callbacks/run.ts

@@ -1,13 +1,15 @@
 // License: LGPL-3.0-or-later
-import Callback from "./Callback";
+import type { CallbackClass } from "./types";
 
 
 /**
  * A very simple function for conditionally running callbacks. Move into own file because we can mock it for CallbackController
  * @param input The input properties to every callback
- * @param callbacks callbacks to be run
+ * @param callbacks callbacks as classes to be run
+ * @template TCallbackProps the properties to be passed into the constructor of each Callback
+ * @returns {Promise<void>} a promise resolving on completion of all of the callbacks. Doesn't currently ever reject.
  */
-export default async function run<TCallbackInput>(input: TCallbackInput, callbacks: ReadonlyArray<{ new(input: TCallbackInput): Callback<TCallbackInput> }>): Promise<void> {
+export default async function run<TCallbackProps>(input: TCallbackProps, callbacks: readonly CallbackClass<TCallbackProps>[]): Promise<void> {
 	try {
 		for (const callback of callbacks) {
 			const obj = new callback(input);