Fix logging option (#1302)

docs/configuration.md

@@ -17,6 +17,7 @@ These are all of the available configuration options.
 | canvas | `null` | Existing `canvas` element to use as a base for drawing on
 | foreignObjectRendering | `false` | Whether to use ForeignObject rendering if the browser supports it
 | imageTimeout | `15000` | Timeout for loading an image (in milliseconds). Set to `0` to disable timeout.
+| logging | `true` | Enable logging for debug purposes
 | proxy | `null` | Url to the [proxy](/proxy/) which is to be used for loading cross-origin images. If left empty, cross-origin images won't be loaded.
 | removeContainer | `true` | Whether to cleanup the cloned DOM elements html2canvas creates temporarily
 | scale | `window.devicePixelRatio` | The scale to use for rendering. Defaults to the browsers device pixel ratio.

src/Logger.js

@@ -2,21 +2,23 @@
 'use strict';
 
 export default class Logger {
+    enabled: boolean;
     start: number;
     id: ?string;
 
-    constructor(id: ?string, start: ?number) {
+    constructor(enabled: boolean, id: ?string, start: ?number) {
+        this.enabled = enabled;
         this.start = start ? start : Date.now();
         this.id = id;
     }
 
     child(id: string) {
-        return new Logger(id, this.start);
+        return new Logger(this.enabled, id, this.start);
     }
 
     // eslint-disable-next-line flowtype/no-weak-types
     log(...args: any) {
-        if (window.console && window.console.log) {
+        if (this.enabled && window.console && window.console.log) {
             Function.prototype.bind
                 .call(window.console.log, window.console)
                 .apply(
@@ -31,7 +33,7 @@ export default class Logger {
 
     // eslint-disable-next-line flowtype/no-weak-types
     error(...args: any) {
-        if (window.console && window.console.error) {
+        if (this.enabled && window.console && window.console.error) {
             Function.prototype.bind
                 .call(window.console.error, window.console)
                 .apply(

src/index.js

@@ -15,6 +15,7 @@ export type Options = {
     canvas: ?HTMLCanvasElement,
     foreignObjectRendering: boolean,
     imageTimeout: number,
+    logging: boolean,
     proxy: ?string,
     removeContainer: ?boolean,
     scale: number,
@@ -37,7 +38,7 @@ const html2canvas = (element: HTMLElement, conf: ?Options): Promise<*> => {
     }
 
     const config = conf || {};
-    const logger = new Logger();
+    const logger = new Logger(typeof config.logging === 'boolean' ? config.logging : true);
 
     if (__DEV__ && typeof config.onrendered === 'function') {
         logger.error(