private registerListeners()

in src/vs/code/electron-main/app.ts [105:305]
140 lines of code
18 McCabe index (conditional complexity)

	private registerListeners(): void {

		// We handle uncaught exceptions here to prevent electron from opening a dialog to the user
		setUnexpectedErrorHandler(err => this.onUnexpectedError(err));
		process.on('uncaughtException', err => this.onUnexpectedError(err));
		process.on('unhandledRejection', (reason: unknown) => onUnexpectedError(reason));

		// Dispose on shutdown
		this.lifecycleMainService.onWillShutdown(() => this.dispose());

		// Contextmenu via IPC support
		registerContextMenuListener();

		app.on('accessibility-support-changed', (event: Event, accessibilitySupportEnabled: boolean) => {
			if (this.windowsMainService) {
				this.windowsMainService.sendToAll('vscode:accessibilitySupportChanged', accessibilitySupportEnabled);
			}
		});

		app.on('activate', (event: Event, hasVisibleWindows: boolean) => {
			this.logService.trace('App#activate');

			// Mac only event: open new window when we get activated
			if (!hasVisibleWindows && this.windowsMainService) {
				this.windowsMainService.openEmptyWindow({ context: OpenContext.DOCK });
			}
		});

		//#region Security related measures (https://electronjs.org/docs/tutorial/security)
		//
		// !!! DO NOT CHANGE without consulting the documentation !!!
		//
		app.on('remote-get-guest-web-contents', event => {
			this.logService.trace('App#on(remote-get-guest-web-contents): prevented');

			event.preventDefault();
		});
		app.on('remote-require', (event, sender, module) => {
			this.logService.trace('App#on(remote-require): prevented');

			event.preventDefault();
		});
		app.on('remote-get-global', (event, sender, module) => {
			this.logService.trace(`App#on(remote-get-global): prevented on ${module}`);

			event.preventDefault();
		});
		app.on('remote-get-builtin', (event, sender, module) => {
			this.logService.trace(`App#on(remote-get-builtin): prevented on ${module}`);

			if (module !== 'clipboard') {
				event.preventDefault();
			}
		});
		app.on('remote-get-current-window', event => {
			this.logService.trace(`App#on(remote-get-current-window): prevented`);

			event.preventDefault();
		});
		app.on('remote-get-current-web-contents', event => {
			if (this.environmentService.args.driver) {
				return; // the driver needs access to web contents
			}

			this.logService.trace(`App#on(remote-get-current-web-contents): prevented`);

			event.preventDefault();
		});
		app.on('web-contents-created', (_event: Event, contents) => {
			contents.on('will-attach-webview', (event: Event, webPreferences, params) => {

				const isValidWebviewSource = (source: string | undefined): boolean => {
					if (!source) {
						return false;
					}

					const uri = URI.parse(source);
					if (uri.scheme === Schemas.vscodeWebview) {
						return uri.path === '/index.html' || uri.path === '/electron-browser/index.html';
					}

					const srcUri = uri.fsPath.toLowerCase();
					const rootUri = URI.file(this.environmentService.appRoot).fsPath.toLowerCase();

					return srcUri.startsWith(rootUri + sep);
				};

				// Ensure defaults
				delete webPreferences.preload;
				webPreferences.nodeIntegration = false;

				// Verify URLs being loaded
				// https://github.com/electron/electron/issues/21553
				if (isValidWebviewSource(params.src) && isValidWebviewSource((webPreferences as { preloadURL: string }).preloadURL)) {
					return;
				}

				delete (webPreferences as { preloadURL: string | undefined }).preloadURL; // https://github.com/electron/electron/issues/21553

				// Otherwise prevent loading
				this.logService.error('webContents#web-contents-created: Prevented webview attach');

				event.preventDefault();
			});

			contents.on('will-navigate', event => {
				this.logService.error('webContents#will-navigate: Prevented webcontent navigation');

				event.preventDefault();
			});

			contents.on('new-window', (event: Event, url: string) => {
				event.preventDefault(); // prevent code that wants to open links

				shell.openExternal(url);
			});

			session.defaultSession.setPermissionRequestHandler((webContents, permission /* 'media' | 'geolocation' | 'notifications' | 'midiSysex' | 'pointerLock' | 'fullscreen' | 'openExternal' */, callback) => {
				return callback(false);
			});

			session.defaultSession.setPermissionCheckHandler((webContents, permission /* 'media' */) => {
				return false;
			});
		});

		//#endregion

		let macOpenFileURIs: IWindowOpenable[] = [];
		let runningTimeout: NodeJS.Timeout | null = null;
		app.on('open-file', (event: Event, path: string) => {
			this.logService.trace('App#open-file: ', path);
			event.preventDefault();

			// Keep in array because more might come!
			macOpenFileURIs.push(this.getWindowOpenableFromPathSync(path));

			// Clear previous handler if any
			if (runningTimeout !== null) {
				clearTimeout(runningTimeout);
				runningTimeout = null;
			}

			// Handle paths delayed in case more are coming!
			runningTimeout = setTimeout(() => {
				if (this.windowsMainService) {
					this.windowsMainService.open({
						context: OpenContext.DOCK /* can also be opening from finder while app is running */,
						cli: this.environmentService.args,
						urisToOpen: macOpenFileURIs,
						gotoLineMode: false,
						preferNewWindow: true /* dropping on the dock or opening from finder prefers to open in a new window */
					});

					macOpenFileURIs = [];
					runningTimeout = null;
				}
			}, 100);
		});

		app.on('new-window-for-tab', () => {
			if (this.windowsMainService) {
				this.windowsMainService.openEmptyWindow({ context: OpenContext.DESKTOP }); //macOS native tab "+" button
			}
		});

		ipc.on('vscode:fetchShellEnv', async (event: IpcMainEvent) => {
			const webContents = event.sender;

			try {
				const shellEnv = await getShellEnvironment(this.logService, this.environmentService);
				if (!webContents.isDestroyed()) {
					webContents.send('vscode:acceptShellEnv', shellEnv);
				}
			} catch (error) {
				if (!webContents.isDestroyed()) {
					webContents.send('vscode:acceptShellEnv', {});
				}

				this.logService.error('Error fetching shell env', error);
			}
		});

		ipc.on('vscode:toggleDevTools', (event: IpcMainEvent) => event.sender.toggleDevTools());
		ipc.on('vscode:openDevTools', (event: IpcMainEvent) => event.sender.openDevTools());

		ipc.on('vscode:reloadWindow', (event: IpcMainEvent) => event.sender.reload());

		// Some listeners after window opened
		(async () => {
			await this.lifecycleMainService.when(LifecycleMainPhase.AfterWindowOpen);

			// Keyboard layout changes (after window opened)
			const nativeKeymap = await import('native-keymap');
			nativeKeymap.onDidChangeKeyboardLayout(() => {
				if (this.windowsMainService) {
					this.windowsMainService.sendToAll('vscode:keyboardLayoutChanged', false);
				}
			});
		})();
	}