module.exports = {
  singleQuote: true,
  trailingComma: 'es5',
  printWidth: 100,
};

module.exports = {
  arrowParens: 'avoid',
  singleQuote: true,
  trailingComma: 'es5',
  printWidth: 100,
};

Set `arrowParens` option to `avoid`
Prettier: Set `arrowParens` option to `avoid`

to match prettier@1 behavior
