feat: expose the desktopCapturer module in the main process (#23548)

lib/browser/desktop-capturer.ts

@@ -7,7 +7,28 @@ let currentlyRunning: {
   getSources: Promise<ElectronInternal.GetSourcesResult[]>;
 }[] = [];
 
-export const getSources = (event: Electron.IpcMainEvent, options: ElectronInternal.GetSourcesOptions) => {
+// |options.types| can't be empty and must be an array
+function isValid (options: Electron.SourcesOptions) {
+  const types = options ? options.types : undefined;
+  return Array.isArray(types);
+}
+
+export const getSourcesImpl = (event: Electron.IpcMainEvent | null, args: Electron.SourcesOptions) => {
+  if (!isValid(args)) throw new Error('Invalid options');
+
+  const captureWindow = args.types.includes('window');
+  const captureScreen = args.types.includes('screen');
+
+  const { thumbnailSize = { width: 150, height: 150 } } = args;
+  const { fetchWindowIcons = false } = args;
+
+  const options = {
+    captureWindow,
+    captureScreen,
+    thumbnailSize,
+    fetchWindowIcons
+  };
+
   for (const running of currentlyRunning) {
     if (deepEqual(running.options, options)) {
       // If a request is currently running for the same options
@@ -39,12 +60,14 @@ export const getSources = (event: Electron.IpcMainEvent, options: ElectronIntern
       resolve(sources);
     };
 
-    capturer.startHandling(options.captureWindow, options.captureScreen, options.thumbnailSize, options.fetchWindowIcons);
+    capturer.startHandling(captureWindow, captureScreen, thumbnailSize, fetchWindowIcons);
 
     // If the WebContents is destroyed before receiving result, just remove the
     // reference to emit and the capturer itself so that it never dispatches
     // back to the renderer
-    event.sender.once('destroyed', () => stopRunning());
+    if (event) {
+      event.sender.once('destroyed', () => stopRunning());
+    }
   });
 
   currentlyRunning.push({