index.js

'use strict';

module.exports = {
  name: require('./package').name,

  included() {
    this._super.included.apply(this, arguments);

    if (
      this.project.targets.browsers &&
      this.project.targets.browsers.includes('ie 11')
    ) {
      throw new Error(
        '`tracked-built-ins` uses Proxy, which is not supported in IE 11 or other older browsers. You have included IE 11 in your targets, which is not supported. Consider using `tracked-maps-and-sets`, which does support IE 11.'
      );
    }
  },
};