Merge from vscode 591842cc4b71958c81947b254924a215fe3edcbd (#4886)

src/vs/code/electron-browser/workbench/workbench.js

@@ -64,7 +64,14 @@ bootstrapWindow.load([
 	});
 
 /**
- * @param {object} configuration
+ * // configuration: IWindowConfiguration
+ * @param {{
+ *	partsSplashPath?: string,
+ *	highContrast?: boolean,
+ *	extensionDevelopmentPath?: string | string[],
+ *	folderUri?: object,
+ *	workspace?: object
+ * }} configuration
  */
 function showPartsSplash(configuration) {
 	perf.mark('willShowPartsSplash');