Update answerMain and answerRenderer to return a function that removes the listener (#8)

Fixes #5

Author: npezza93

readme.md

@@ -140,6 +140,8 @@ Data to send to the receiver.
 
 This method listens for a message from `ipc.callMain` defined in a renderer process and replies back.
 
+Returns a function, that when called, removes the listener.
+
 #### channel
 
 Type: `string`
@@ -192,6 +194,8 @@ Data to send to the receiver.
 
 This method listens for a message from `ipc.callRenderer` defined in the main process and replies back.
 
+Returns a function, that when called, removes the listener.
+
 #### channel
 
 Type: `string`

source/main.js

@@ -30,7 +30,7 @@ ipc.callRenderer = (window, channel, data) => new Promise((resolve, reject) => {
 ipc.answerRenderer = (channel, callback) => {
 	const {sendChannel, dataChannel, errorChannel} = util.getResponseChannels(channel);
 
-	ipc.on(sendChannel, async (event, data) => {
+	const listener = async (event, data) => {
 		const window = BrowserWindow.fromWebContents(event.sender);
 
 		const send = (channel, data) => {
@@ -44,7 +44,12 @@ ipc.answerRenderer = (channel, callback) => {
 		} catch (error) {
 			send(errorChannel, error);
 		}
-	});
+	};
+
+	ipc.on(sendChannel, listener);
+	return () => {
+		ipc.removeListener(sendChannel, listener);
+	};
 };
 
 ipc.sendToRenderers = (channel, data) => {

source/renderer.js

@@ -29,13 +29,18 @@ ipc.answerMain = (channel, callback) => {
 	const window = electron.remote.getCurrentWindow();
 	const {sendChannel, dataChannel, errorChannel} = util.getRendererResponseChannels(window.id, channel);
 
-	ipc.on(sendChannel, async (event, data) => {
+	const listener = async (event, data) => {
 		try {
 			ipc.send(dataChannel, await callback(data));
-		} catch (err) {
-			ipc.send(errorChannel, err);
+		} catch (error) {
+			ipc.send(errorChannel, error);
 		}
-	});
+	};
+
+	ipc.on(sendChannel, listener);
+	return () => {
+		ipc.removeListener(sendChannel, listener);
+	};
 };
 
 module.exports = ipc;