[preprocessor.coverage]: 'import' and 'export' may appear only with 'sourceType: "module"'

karma.conf.js

...
files: [
      { pattern: 'js/add.js', type: 'module' },
      { pattern: 'test/add.spec.js', type: 'module' }
 ],
preprocessors: {
      './js/add.js': ['coverage']
},
...

add.js

let add = n => ++n;
export { add };

add.spec.js

import { add } from '../js/add.js';
describe('test', function() {
  it('add', function() {
    expect(add(2)).toBe(3);
  });
});

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karma-runner / karma-coverage

[preprocessor.coverage]: 'import' and 'export' may appear only with 'sourceType: "module"' #383