refactor: throw errors directly in async functions (#39233)

lib/browser/api/web-contents.ts

@@ -211,28 +211,28 @@ WebContents.prototype.printToPDF = async function (options) {
 
   if (options.landscape !== undefined) {
     if (typeof options.landscape !== 'boolean') {
-      return Promise.reject(new Error('landscape must be a Boolean'));
+      throw new Error('landscape must be a Boolean');
     }
     printSettings.landscape = options.landscape;
   }
 
   if (options.displayHeaderFooter !== undefined) {
     if (typeof options.displayHeaderFooter !== 'boolean') {
-      return Promise.reject(new Error('displayHeaderFooter must be a Boolean'));
+      throw new Error('displayHeaderFooter must be a Boolean');
     }
     printSettings.displayHeaderFooter = options.displayHeaderFooter;
   }
 
   if (options.printBackground !== undefined) {
     if (typeof options.printBackground !== 'boolean') {
-      return Promise.reject(new Error('printBackground must be a Boolean'));
+      throw new Error('printBackground must be a Boolean');
     }
     printSettings.shouldPrintBackgrounds = options.printBackground;
   }
 
   if (options.scale !== undefined) {
     if (typeof options.scale !== 'number') {
-      return Promise.reject(new Error('scale must be a Number'));
+      throw new Error('scale must be a Number');
     }
     printSettings.scale = options.scale;
   }
@@ -242,53 +242,53 @@ WebContents.prototype.printToPDF = async function (options) {
     if (typeof pageSize === 'string') {
       const format = paperFormats[pageSize.toLowerCase()];
       if (!format) {
-        return Promise.reject(new Error(`Invalid pageSize ${pageSize}`));
+        throw new Error(`Invalid pageSize ${pageSize}`);
       }
 
       printSettings.paperWidth = format.width;
       printSettings.paperHeight = format.height;
     } else if (typeof options.pageSize === 'object') {
       if (!pageSize.height || !pageSize.width) {
-        return Promise.reject(new Error('height and width properties are required for pageSize'));
+        throw new Error('height and width properties are required for pageSize');
       }
 
       printSettings.paperWidth = pageSize.width;
       printSettings.paperHeight = pageSize.height;
     } else {
-      return Promise.reject(new Error('pageSize must be a String or Object'));
+      throw new Error('pageSize must be a String or Object');
     }
   }
 
   const { margins } = options;
   if (margins !== undefined) {
     if (typeof margins !== 'object') {
-      return Promise.reject(new Error('margins must be an Object'));
+      throw new Error('margins must be an Object');
     }
 
     if (margins.top !== undefined) {
       if (typeof margins.top !== 'number') {
-        return Promise.reject(new Error('margins.top must be a Number'));
+        throw new Error('margins.top must be a Number');
       }
       printSettings.marginTop = margins.top;
     }
 
     if (margins.bottom !== undefined) {
       if (typeof margins.bottom !== 'number') {
-        return Promise.reject(new Error('margins.bottom must be a Number'));
+        throw new Error('margins.bottom must be a Number');
       }
       printSettings.marginBottom = margins.bottom;
     }
 
     if (margins.left !== undefined) {
       if (typeof margins.left !== 'number') {
-        return Promise.reject(new Error('margins.left must be a Number'));
+        throw new Error('margins.left must be a Number');
       }
       printSettings.marginLeft = margins.left;
     }
 
     if (margins.right !== undefined) {
       if (typeof margins.right !== 'number') {
-        return Promise.reject(new Error('margins.right must be a Number'));
+        throw new Error('margins.right must be a Number');
       }
       printSettings.marginRight = margins.right;
     }
@@ -296,28 +296,28 @@ WebContents.prototype.printToPDF = async function (options) {
 
   if (options.pageRanges !== undefined) {
     if (typeof options.pageRanges !== 'string') {
-      return Promise.reject(new Error('pageRanges must be a String'));
+      throw new Error('pageRanges must be a String');
     }
     printSettings.pageRanges = options.pageRanges;
   }
 
   if (options.headerTemplate !== undefined) {
     if (typeof options.headerTemplate !== 'string') {
-      return Promise.reject(new Error('headerTemplate must be a String'));
+      throw new Error('headerTemplate must be a String');
     }
     printSettings.headerTemplate = options.headerTemplate;
   }
 
   if (options.footerTemplate !== undefined) {
     if (typeof options.footerTemplate !== 'string') {
-      return Promise.reject(new Error('footerTemplate must be a String'));
+      throw new Error('footerTemplate must be a String');
     }
     printSettings.footerTemplate = options.footerTemplate;
   }
 
   if (options.preferCSSPageSize !== undefined) {
     if (typeof options.preferCSSPageSize !== 'boolean') {
-      return Promise.reject(new Error('preferCSSPageSize must be a Boolean'));
+      throw new Error('preferCSSPageSize must be a Boolean');
     }
     printSettings.preferCSSPageSize = options.preferCSSPageSize;
   }
@@ -330,8 +330,7 @@ WebContents.prototype.printToPDF = async function (options) {
     }
     return pendingPromise;
   } else {
-    const error = new Error('Printing feature is disabled');
+    throw new Error('Printing feature is disabled');
-    return Promise.reject(error);
   }
 };
 

lib/common/deprecate.ts

@@ -46,7 +46,7 @@ export function log (message: string): void {
 
 // remove a function with no replacement
 export function removeFunction<T extends Function> (fn: T, removedName: string): T {
-  if (!fn) { throw Error(`'${removedName} function' is invalid or does not exist.`); }
+  if (!fn) { throw new Error(`'${removedName} function' is invalid or does not exist.`); }
 
   // wrap the deprecated function to warn user
   const warn = warnOnce(`${fn.name} function`);

spec/api-app-spec.ts

@@ -1422,7 +1422,7 @@ describe('app module', () => {
         }
       } else {
         // return error if not clean exit
-        return Promise.reject(new Error(errorData));
+        throw new Error(errorData);
       }
     };
     const verifyBasicGPUInfo = async (gpuInfo: any) => {