feat(electron): move preload to infra (#3011)

packages/infra/src/core/event-emitter.ts

@@ -0,0 +1,74 @@
+/**
+ * The MIT License (MIT)
+ *
+ * Copyright (c) 2018 Andy Wermke
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+export type EventMap = {
+  [key: string]: (...args: any[]) => void;
+};
+
+/**
+ * Type-safe event emitter.
+ *
+ * Use it like this:
+ *
+ * ```typescript
+ * type MyEvents = {
+ *   error: (error: Error) => void;
+ *   message: (from: string, content: string) => void;
+ * }
+ *
+ * const myEmitter = new EventEmitter() as TypedEmitter<MyEvents>;
+ *
+ * myEmitter.emit("error", "x")  // <- Will catch this type error;
+ * ```
+ *
+ * Lifecycle:
+ *  invoke -> handle -> emit -> on/once
+ */
+export interface TypedEventEmitter<Events extends EventMap> {
+  addListener<E extends keyof Events>(event: E, listener: Events[E]): this;
+  on<E extends keyof Events>(event: E, listener: Events[E]): this;
+  once<E extends keyof Events>(event: E, listener: Events[E]): this;
+
+  off<E extends keyof Events>(event: E, listener: Events[E]): this;
+  removeAllListeners<E extends keyof Events>(event?: E): this;
+  removeListener<E extends keyof Events>(event: E, listener: Events[E]): this;
+
+  emit<E extends keyof Events>(
+    event: E,
+    ...args: Parameters<Events[E]>
+  ): boolean;
+  // The sloppy `eventNames()` return type is to mitigate type incompatibilities - see #5
+  eventNames(): (keyof Events | string | symbol)[];
+  rawListeners<E extends keyof Events>(event: E): Events[E][];
+  listeners<E extends keyof Events>(event: E): Events[E][];
+  listenerCount<E extends keyof Events>(event: E): number;
+
+  handle<E extends keyof Events>(event: E, handler: Events[E]): this;
+  invoke<E extends keyof Events>(
+    event: E,
+    ...args: Parameters<Events[E]>
+  ): Promise<ReturnType<Events[E]>>;
+
+  getMaxListeners(): number;
+  setMaxListeners(maxListeners: number): this;
+}