- Optimization: Re-rerun image optimization per update

- Linting (ESLint): Adjust per now applied rules
- Testing: Accessibility test API update
- Docs: Clarify need for Node.js/npm being installed
- npm: Update devDeps and core-js-bundle copy; add new axe testing peer dep. axe-core

test/ui-tests/accessibility.js

@@ -1,7 +1,7 @@
 // https://github.com/DevExpress/testcafe
 // https://devexpress.github.io/testcafe/documentation/test-api/
 // https://github.com/helen-dikareva/axe-testcafe
-import axeCheck from 'axe-testcafe';
+import {axeCheck, createReport} from 'axe-testcafe';
 
 /**
 * @external AxeResult
@@ -13,8 +13,8 @@ import axeCheck from 'axe-testcafe';
  * @param {external.TestcafeTest} t
  * @returns {Promise<external:AxeResult>}
  */
-function axeCheckWithConfig (t) {
-  return axeCheck(
+async function axeCheckWithConfig (t) {
+  const /* error, */ {violations} = await axeCheck(
     t,
     // context: https://github.com/dequelabs/axe-core/blob/develop/doc/API.md#context-parameter
     undefined,
@@ -26,6 +26,7 @@ function axeCheckWithConfig (t) {
     }
     // , (err, results) {} // https://github.com/dequelabs/axe-core/blob/develop/doc/API.md#results-object
   );
+  await t.expect(violations.length === 0).ok(createReport(violations));
 }
 
 fixture`TestCafe Axe accessibility tests (Editor - no parameters)`