Typescript definitions (#25)

* Added type definitions

* Handler only has exactly one or no argument

* Moved type defs to root folder

1 files changed, 46 insertions, 0 deletions

diff --git a/mitt.d.ts b/mitt.d.ts
new file mode 100644
index 0000000..41ea221
--- /dev/null
+++ b/mitt.d.ts
@@ -0,0 +1,46 @@
+declare var mitt: mitt.MittStatic;
+
+declare module "mitt" {
+    export = mitt;
+}
+
+declare namespace mitt {
+	type Handler = (event?: any) => void;
+
+	interface MittStatic {
+		new(all?: {[key: string]: Handler}): Emitter;
+	}
+
+	interface Emitter {
+		/**
+		 * Register an event handler for the given type.
+		 * 
+		 * @param {string} type Type of event to listen for, or `"*"` for all events.
+		 * @param {Handler} handler Function to call in response to the given event.
+		 * 
+		 * @memberOf Mitt
+		 */
+		on(type: string, handler: Handler): void;
+
+		/**
+		 * Function to call in response to the given event
+		 * 
+		 * @param {string} type Type of event to unregister `handler` from, or `"*"`
+		 * @param {Handler} handler Handler function to remove.
+		 * 
+		 * @memberOf Mitt
+		 */
+		off(type: string, handler: Handler): void;
+
+		/**
+		 * Invoke all handlers for the given type.
+		 * If present, `"*"` handlers are invoked prior to type-matched handlers.
+		 * 
+		 * @param {string} type The event type to invoke
+		 * @param {any} [event] An event object, passed to each handler
+		 * 
+		 * @memberOf Mitt
+		 */
+		emit(type: string, event?: any): void;
+	}
+}