update code formatting

Author: Donaldcwl

lib/utils.js

@@ -1,7 +1,8 @@
 // add support for cordova-plugin-file
-const moduleMapper = typeof window !== 'undefined' && window.cordova && window.cordova.require && window.cordova.require('cordova/modulemapper');
-export const CustomFile = (moduleMapper && moduleMapper.getOriginalSymbol(window, 'File')) || File;
-export const CustomFileReader = (moduleMapper && moduleMapper.getOriginalSymbol(window, 'FileReader')) || FileReader;
+const moduleMapper = typeof window !== 'undefined' && window.cordova && window.cordova.require && window.cordova.require('cordova/modulemapper')
+export const CustomFile = (moduleMapper && moduleMapper.getOriginalSymbol(window, 'File')) || File
+export const CustomFileReader = (moduleMapper && moduleMapper.getOriginalSymbol(window, 'FileReader')) || FileReader
+
 /**
  * getDataUrlFromFile
  *
@@ -259,6 +260,9 @@ export function getNewCanvasAndCtx (width, height) {
   try {
     canvas = new OffscreenCanvas(width, height)
     ctx = canvas.getContext('2d')
+    if (ctx === null) {
+      throw new Error('getContext of OffscreenCanvas returns null')
+    }
   } catch (e) {
     canvas = document.createElement('canvas')
     ctx = canvas.getContext('2d')
@@ -268,18 +272,19 @@ export function getNewCanvasAndCtx (width, height) {
   return [canvas, ctx]
 }
 
-Number.isInteger = Number.isInteger || function(value) {
-  return typeof value === 'number' && 
-    isFinite(value) && 
-    Math.floor(value) === value;
+Number.isInteger = Number.isInteger || function (value) {
+  return typeof value === 'number' &&
+    isFinite(value) &&
+    Math.floor(value) === value
+}
 
 /**
  * clear Canvas memory
  * @param canvas
  * @returns null
  */
-export function cleanupMemory(canvas) {
-  canvas.width = 0;
-  canvas.height = 0;
-  canvas = null;
+export function cleanupMemory (canvas) {
+  canvas.width = 0
+  canvas.height = 0
+  canvas = null
 }