initial commit

src/keybindEmitter.ts

@@ -0,0 +1,22 @@
+import type { KeybindEvent } from "./types";
+
+type Listener = (event: KeybindEvent) => void;
+
+export class KeybindEmitter {
+  private listeners: Listener[] = [];
+
+  on(listener: Listener) {
+    this.listeners.push(listener);
+    return () => this.off(listener);
+  }
+
+  off(listener: Listener) {
+    this.listeners = this.listeners.filter(l => l !== listener);
+  }
+
+  emit<T extends KeybindEvent["type"]>(
+    event: Extract<KeybindEvent, { type: T }>
+  ) {
+    for (const l of this.listeners) l(event);
+  }
+}