Move TypedEventEmitter into its own file

packages/lib/browser.ts

@@ -14,3 +14,4 @@ export * from "./src/subscriptions";
 
 export { default as ExponentialBackoff } from "./src/ExponentialBackoff";
 export { default as RateLimiter } from "./src/RateLimiter";
+export { default as TypedEventEmitter } from "./src/TypedEventEmitter";

packages/lib/index.ts

@@ -31,3 +31,4 @@ export * from "./src/subscriptions";
 export { default as ExponentialBackoff } from "./src/ExponentialBackoff";
 export { default as ModStore } from "./src/ModStore";
 export { default as RateLimiter } from "./src/RateLimiter";
+export { default as TypedEventEmitter } from "./src/TypedEventEmitter";

packages/lib/src/ModStore.ts

@@ -2,17 +2,7 @@ import fs from "fs-extra";
 import path from "path";
 import { logger } from "./logging";
 import { ModInfo } from "./data";
-import EventEmitter from "events";
-
-abstract class TypedEventEmitter<
-	Keys extends string,
-	Events extends Record<Keys, (...args: [...any]) => void>,
-> extends EventEmitter {
-	declare ["on"]: <E extends Keys>(event: E, listener: Events[E]) => this;
-	declare ["off"]: <E extends Keys>(event: E, listener: Events[E]) => this;
-	declare ["once"]: <E extends Keys>(event: E, listener: Events[E]) => this;
-	declare ["emit"]: <E extends Keys>(event: E, ...args: Parameters<Events[E]>) => boolean;
-}
+import TypedEventEmitter from "./TypedEventEmitter";
 
 export interface ModStoreEvents {
 	/** A stored mod was created, updated or deleted */

packages/lib/src/TypedEventEmitter.ts

@@ -0,0 +1,27 @@
+import EventEmitter from "events";
+
+/**
+ * Type checked version of EventEmitter
+ *
+ * @example
+ * ```ts
+ * interface Events {
+ *     "foo": (a: number, b: number) => void,
+ *     "bar": (spam: string) => void,
+ * }
+ *
+ * class Emitter extends TypedEventEmitter<keyof Events, Events> {}
+ *
+ * const e = new Emitter();
+ * e.emit("foo", 1, 2) // type checked arguments
+ * ```
+ */
+export default abstract class TypedEventEmitter<
+	Keys extends string,
+	Events extends Record<Keys, (...args: [...any]) => void>,
+> extends EventEmitter {
+	declare ["on"]: <E extends Keys>(event: E, listener: Events[E]) => this;
+	declare ["off"]: <E extends Keys>(event: E, listener: Events[E]) => this;
+	declare ["once"]: <E extends Keys>(event: E, listener: Events[E]) => this;
+	declare ["emit"]: <E extends Keys>(event: E, ...args: Parameters<Events[E]>) => boolean;
+}