[Vega] remove VEGA_DEBUG (elastic#234477)

This commit removes the VEGA_DEBUG variable from window object.

(cherry picked from commit 03f47de)

# Conflicts:
#	src/plugins/vis_types/vega/public/vega_view/vega_base_view.js
#	src/plugins/vis_types/vega/public/vega_visualization.test.js

Author: markov00

src/plugins/vis_types/vega/public/vega_view/vega_base_view.js

@@ -9,9 +9,8 @@
 import $ from 'jquery';
 import moment from 'moment';
 import dateMath from '@elastic/datemath';
-import { scheme, loader, logger, Warn, version as vegaVersion, expressionFunction } from 'vega';
+import { scheme, loader, logger, Warn, expressionFunction } from 'vega';
 import { expressionInterpreter } from 'vega-interpreter';
-import { version as vegaLiteVersion } from 'vega-lite';
 import { Utils } from '../data_model/utils';
 import { euiPaletteColorBlind } from '@elastic/eui';
 import { i18n } from '@kbn/i18n';
@@ -467,30 +466,6 @@ export class VegaBaseView {
       view,
       spec: vlspec || spec,
     });
-
-    if (window) {
-      if (window.VEGA_DEBUG === undefined && console) {
-        console.log('%cWelcome to Kibana Vega Plugin!', 'font-size: 16px; font-weight: bold;');
-        console.log(
-          'You can access the Vega view with VEGA_DEBUG. ' +
-            'Learn more at https://vega.github.io/vega/docs/api/debugging/.'
-        );
-      }
-      const debugObj = {};
-      window.VEGA_DEBUG = debugObj;
-      window.VEGA_DEBUG.VEGA_VERSION = vegaVersion;
-      window.VEGA_DEBUG.VEGA_LITE_VERSION = vegaLiteVersion;
-      window.VEGA_DEBUG.view = view;
-      window.VEGA_DEBUG.vega_spec = spec;
-      window.VEGA_DEBUG.vegalite_spec = vlspec;
-
-      // On dispose, clean up, but don't use undefined to prevent repeated debug statements
-      this._addDestroyHandler(() => {
-        if (debugObj === window.VEGA_DEBUG) {
-          window.VEGA_DEBUG = null;
-        }
-      });
-    }
   }
 
   destroy() {

src/plugins/vis_types/vega/public/vega_visualization.test.js

@@ -83,9 +83,6 @@ describe('VegaVisualizations', () => {
     });
 
     test('should show vegalite graph and update on resize (may fail in dev env)', async () => {
-      const mockedConsoleLog = jest.spyOn(console, 'log'); // mocked console.log to avoid messages in the console when running tests
-      mockedConsoleLog.mockImplementation(() => {}); //  comment this line when console logging for debugging comment this line
-
       let vegaVis;
       try {
         vegaVis = new VegaVisualization(domNode, jest.fn());
@@ -115,8 +112,6 @@ describe('VegaVisualizations', () => {
       } finally {
         vegaVis.destroy();
       }
-      expect(console.log).toBeCalledTimes(2);
-      mockedConsoleLog.mockRestore();
     });
 
     test('should show vega graph (may fail in dev env)', async () => {