Vue vue-sweetalert2 . error in test:unit with Jest - unit-testing

Question

As per the vue-sweetalert2 doc, in my main.js, I import and use the plugin:
import VueSweetalert2 from "vue-sweetalert2";
Vue.use(VueSweetalert2);
In my component, ContactForm.vue, I can use:
this.$swal(...)
However, when I test:unit this component, I need to add the import and Vue.use()
import VueSweetalert2 from "vue-sweetalert2";
Vue.use(VueSweetalert2);
and I get an error:
$ vue-cli-service test:unit ContactForm.spec.js
FAIL tests/unit/ContactForm.spec.js
● Test suite failed to run
Jest encountered an unexpected token
This usually means that you are trying to import a file which Jest cannot parse, e.g. it's not plain JavaScript.
By default, if Jest sees a Babel config, it will use that to transform your files, ignoring "node_modules".
Here's what you can do:
• To have some of your "node_modules" files transformed, you can specify a custom "transformIgnorePatterns" in your config.
• If you need a custom transformation specify a "transform" option in your config.
• If you simply want to mock your non-JS modules (e.g. binary assets) you can stub them out with the "moduleNameMapper" config option.
You'll find more details and examples of these config options in the docs:
https://jestjs.io/docs/en/configuration.html
Details:
/Users/yves/Developments/WIP/VUE.JS-cli-3/3-chocha-home-content/chocha/node_modules/vue-sweetalert2/src/index.js:2
import swal from 'sweetalert2/dist/sweetalert2.min.js';
^^^^^^
SyntaxError: Unexpected token import
What could be wrong?
UPDATE
the vue-sweetalert2/src/index.js, line 2 faulty line, is:
// #ts-check
import swal from 'sweetalert2/dist/sweetalert2.min.js';
the developer of this wrapper added an index.d.ts fie
import Vue, { PluginObject, PluginFunction } from 'vue';
import * as swal from 'sweetalert2';
...
but it seems not to be taken in account.

Answer 1

SOLVED ...
I added a transformIgnorePatterns in my jest config in package.json
"jest": {
....
"transformIgnorePatterns": [
"/node_modules/(?!vue-sweetalert2).+\\.js$"
],
....
}