| Files or packages | Command or configuration to modify |
|---|---|
| babel-polyfill | npm i -save babel-polyfill |
| karma.conf.js | files: ['../../node_modules/babel-polyfill/dist/polyfill.js','./index.js'], |
| webpack.base.conf.js | app: ['babel-polyfill', './src/main.js'] |
The configurations described above, the example using a non-sstandardised function will work on "internet explorer" and npm test will pass.