Disable debug logs in production

console.debug logs cause some performance issues because the browser
is forced to save the logged objects just in case the user opens the
debugging tools.

They can be force-enabled back by adding ?debug=1 to the URL.

Only console.debug is disabled, console.log and other levels are a lot
less verbose and still enabled by default.

README.md

@@ -84,6 +84,7 @@ gamja settings can be overridden using URL query parameters:
 - `nick`: nickname
 - `channels`: comma-separated list of channels to join (`#` needs to be escaped)
 - `open`: [IRC URL] to open
+- `debug`: if set to 1, debug mode is enabled
 
 Alternatively, the channels can be set with the URL fragment (ie, by just
 appending the channel name to the gamja URL).

components/app.js

@@ -48,6 +48,15 @@ const configPromise = fetch("./config.json")
 
 const CHATHISTORY_MAX_SIZE = 4000;
 
+function isProduction() {
+	// NODE_ENV is set by the Parcel build system
+	try {
+		return process.env.NODE_ENV === "production";
+	} catch (err) {
+		return false;
+	}
+}
+
 function parseQueryString() {
 	let query = window.location.search.substring(1);
 	let params = {};
@@ -162,6 +171,7 @@ export default class App extends Component {
 			memberList: false,
 		},
 	};
+	debug = !isProduction();
 	config = { ...baseConfig };
 	clients = new Map();
 	endOfHistory = new Map();
@@ -279,6 +289,9 @@ export default class App extends Component {
 		if (typeof queryParams.open === "string") {
 			this.autoOpenURL = irc.parseURL(queryParams.open);
 		}
+		if (queryParams.debug === "1") {
+			this.debug = true;
+		}
 
 		if (window.location.hash) {
 			autojoin = window.location.hash.split(",");
@@ -579,6 +592,8 @@ export default class App extends Component {
 		this.setState({ connectParams: params });
 
 		let client = new Client(fillConnectParams(params));
+		client.debug = this.debug;
+
 		this.clients.set(serverID, client);
 		this.setServerState(serverID, { status: client.status });
 

lib/client.js

@@ -76,6 +76,7 @@ export default class Client extends EventTarget {
 		saslExternal: false,
 		bouncerNetwork: null,
 	};
+	debug = false;
 	batches = new Map();
 	autoReconnect = true;
 	reconnectTimeoutID = null;
@@ -225,7 +226,9 @@ export default class Client extends EventTarget {
 		}
 
 		let msg = irc.parseMessage(event.data);
-		console.debug("Received:", msg);
+		if (this.debug) {
+			console.debug("Received:", msg);
+		}
 
 		// If the prefix is missing, assume it's coming from the server on the
 		// other end of the connection
@@ -653,7 +656,9 @@ export default class Client extends EventTarget {
 			throw new Error("Failed to send IRC message " + msg.command + ": socket is closed");
 		}
 		this.ws.send(irc.formatMessage(msg));
-		console.debug("Sent:", msg);
+		if (this.debug) {
+			console.debug("Sent:", msg);
+		}
 	}
 
 	setCaseMapping(name) {