Lexical: Started converting drawio to TS

Converted events service to TS as part of this.

resources/js/services/events.ts

@@ -0,0 +1,71 @@
+export class EventManager {
+    protected listeners: Record<string, ((data: {}) => void)[]> = {};
+    protected stack: {name: string, data: {}}[] = [];
+
+    /**
+     * Emit a custom event for any handlers to pick-up.
+     */
+    emit(eventName: string, eventData: {}): void {
+        this.stack.push({name: eventName, data: eventData});
+
+        const listenersToRun = this.listeners[eventName] || [];
+        for (const listener of listenersToRun) {
+            listener(eventData);
+        }
+    }
+
+    /**
+     * Listen to a custom event and run the given callback when that event occurs.
+     */
+    listen(eventName: string, callback: (data: {}) => void): void {
+        if (typeof this.listeners[eventName] === 'undefined') this.listeners[eventName] = [];
+        this.listeners[eventName].push(callback);
+    }
+
+    /**
+     * Emit an event for public use.
+     * Sends the event via the native DOM event handling system.
+     */
+    emitPublic(targetElement: Element, eventName: string, eventData: {}): void {
+        const event = new CustomEvent(eventName, {
+            detail: eventData,
+            bubbles: true,
+        });
+        targetElement.dispatchEvent(event);
+    }
+
+    /**
+     * Emit a success event with the provided message.
+     */
+    success(message: string): void {
+        this.emit('success', message);
+    }
+
+    /**
+     * Emit an error event with the provided message.
+     */
+    error(message: string): void {
+        this.emit('error', message);
+    }
+
+    /**
+     * Notify of standard server-provided validation errors.
+     */
+    showValidationErrors(responseErr: {status?: number, data?: object}): void {
+        if (!responseErr.status) return;
+        if (responseErr.status === 422 && responseErr.data) {
+            const message = Object.values(responseErr.data).flat().join('\n');
+            this.error(message);
+        }
+    }
+
+    /**
+     * Notify standard server-provided error messages.
+     */
+    showResponseError(responseErr: {status?: number, data?: {message?: string}}): void {
+        if (!responseErr.status) return;
+        if (responseErr.status >= 400 && responseErr.data && responseErr.data.message) {
+            this.error(responseErr.data.message);
+        }
+    }
+}