All: Add support for application plugins (#3257)

ReactNativeClient/lib/services/plugins/utils/mapEventHandlersToIds.ts

@@ -0,0 +1,29 @@
+let eventHandlerIndex_ = 1;
+
+export interface EventHandlers {
+	[key:string]: Function;
+}
+
+export default function mapEventHandlersToIds(arg:any, eventHandlers:EventHandlers) {
+	if (Array.isArray(arg)) {
+		for (let i = 0; i < arg.length; i++) {
+			arg[i] = mapEventHandlersToIds(arg[i], eventHandlers);
+		}
+		return arg;
+	} else if (typeof arg === 'function') {
+		const id = `___plugin_event_${eventHandlerIndex_}`;
+		eventHandlerIndex_++;
+		eventHandlers[id] = arg;
+		return id;
+	} else if (arg === null) {
+		return null;
+	} else if (arg === undefined) {
+		return undefined;
+	} else if (typeof arg === 'object') {
+		for (const n in arg) {
+			arg[n] = mapEventHandlersToIds(arg[n], eventHandlers);
+		}
+	}
+
+	return arg;
+}