refactor: re-implement desktop-capturer in TypeScript (#18580)

lib/renderer/api/desktop-capturer.ts

@@ -0,0 +1,33 @@
+import { nativeImage } from 'electron'
+import * as ipcRendererUtils from '@electron/internal/renderer/ipc-renderer-internal-utils'
+
+// |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 async function getSources (options: Electron.SourcesOptions) {
+  if (!isValid(options)) throw new Error('Invalid options')
+
+  const captureWindow = options.types.includes('window')
+  const captureScreen = options.types.includes('screen')
+
+  const { thumbnailSize = { width: 150, height: 150 } } = options
+  const { fetchWindowIcons = false } = options
+
+  const sources = await ipcRendererUtils.invoke<ElectronInternal.GetSourcesResult[]>('ELECTRON_BROWSER_DESKTOP_CAPTURER_GET_SOURCES', {
+    captureWindow,
+    captureScreen,
+    thumbnailSize,
+    fetchWindowIcons
+  } as ElectronInternal.GetSourcesOptions)
+
+  return sources.map(source => ({
+    id: source.id,
+    name: source.name,
+    thumbnail: nativeImage.createFromDataURL(source.thumbnail),
+    display_id: source.display_id,
+    appIcon: source.appIcon ? nativeImage.createFromDataURL(source.appIcon) : null
+  }))
+}