first commit

xterminal/source/renderer/events.ts

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+import type { IDisposable } from "../types";
+
+export const ENTER_KEY = "Enter",
+    TAB_KEY = "Tab",
+    ARROW_UP_KEY = "ArrowUp",
+    ARROW_DOWN_KEY = "ArrowDown";
+
+/**
+ * Attaches an event listener to the element returning a disposable object
+ * to remove the event listener
+ */
+export function addEvent(
+    el: Element | Document | Window | VisualViewport | EventTarget,
+    type: string,
+    // eslint-disable-next-line @typescript-eslint/no-explicit-any
+    handler: (e: any) => void,
+    opt?: boolean | AddEventListenerOptions
+): IDisposable {
+    el.addEventListener(type, handler, opt);
+    let disposed = false;
+    return {
+        dispose() {
+            if (disposed) return;
+            el.removeEventListener(type, handler, opt);
+            disposed = true;
+        }
+    };
+}