- Linting (JSDoc): Update per newly enforced require-returns; avoid Closure syntax

- Docs (JSDoc): Prefer `void`
- npm: Update devDeps

test/utilities_test.js

@@ -291,6 +291,7 @@ QUnit.test('Test getBBoxOfElementAsPath', function (assert) {
   /**
    * Wrap `utilities.getBBoxOfElementAsPath` to convert bbox to object for testing.
    * @implements {module:utilities.getBBoxOfElementAsPath}
+   * @returns {DOMRect|false} The resulting path's bounding box object.
    */
   function getBBoxOfElementAsPath (elem, addSVGElementFromJson, pathActions) {
     const bbox = utilities.getBBoxOfElementAsPath(elem, addSVGElementFromJson, pathActions);