Provide off on event listeners

Author: code-asher

packages/protocol/src/common/proxy.ts

@@ -53,6 +53,17 @@ export abstract class ClientProxy<T extends ServerProxy> extends EventEmitter {
 		}
 	}
 
+	/**
+	 * Remove an event listener.
+	 */
+	public off(event: string, cb: (...args: any[]) => void): this {
+		// Fill it here because the fill we're using to provide EventEmitter for the
+		// browser doesn't appear to include `off`.
+		this.removeListener(event, cb);
+
+		return this;
+	}
+
 	protected get proxy(): T {
 		if (!this._proxy) {
 			throw new Error("not initialized");

packages/protocol/test/net.test.ts

@@ -38,6 +38,23 @@ describe("net", () => {
 			expect(fn).toHaveBeenCalledTimes(1);
 		});
 
+		it("should remove event listener", async () => {
+			const socket = new net.Socket();
+
+			const fn1 = jest.fn();
+			const fn2 = jest.fn();
+
+			socket.on("error", fn1);
+			socket.on("error", fn2);
+			socket.off("error", fn1);
+
+			socket.connect("/tmp/t/e/s/t/d/o/e/s/n/o/t/e/x/i/s/t");
+
+			await new Promise((r): nativeNet.Socket => socket.on("close", r));
+			expect(fn1).toHaveBeenCalledTimes(0);
+			expect(fn2).toHaveBeenCalledTimes(1);
+		});
+
 		it("should connect", async () => {
 			await new Promise((resolve): void => {
 				const socket = net.createConnection(socketPath, () => {