.eslintrc.js

module.exports = {
  env: { browser: true, es6: true, commonjs: true },
  extends: ['eslint:recommended', 'plugin:compat/recommended'],
  parser: 'babel-eslint',
  parserOptions: {
    ecmaFeatures: { experimentalObjectRestSpread: true, jsx: true },
    sourceType: 'module',
  },
  plugins: ['react'],
  rules: {
    'react/prop-types': 0,
    'react/jsx-uses-vars': [2],
  },
};

index.js

export default string => {
  if (!string.startsWith('http')) {
    // expecting error - but none
    return false;
  }

  return true;
};

package.json

{
  "name": "compat-test",
  "version": "1.0.0",
  "description": "",
  "main": "index.js",
  "scripts": {
    "test": "echo \"Error: no test specified\" && exit 1"
  },
  "keywords": [],
  "author": "",
  "license": "ISC",
  "devDependencies": {
    "babel-eslint": "^8.2.3",
    "eslint": "^4.19.1",
    "eslint-plugin-compat": "^2.4.0",
    "eslint-plugin-react": "^7.9.1"
  }
}