exports.getPreset = function (api, options) {
  return {
    plugins: [
      require("@babel/plugin-syntax-flow"),
      require("@babel/plugin-syntax-async-generators"),
      require("@babel/plugin-syntax-object-rest-spread"),
      require("@babel/plugin-check-constants"),
      [require("@babel/plugin-transform-for-of"), {
        loose: true
      }],
      require("@babel/plugin-transform-literals"),
      require("@babel/plugin-transform-template-literals"),
      // [require("@babel/plugin-transform-classes"), {
      //   loose: true
      // }],
      require("@babel/plugin-transform-parameters"),
      // require("@babel/plugin-transform-unicode-regex"),
      require("@babel/plugin-proposal-object-rest-spread"),
      require("@babel/plugin-transform-flow-strip-types"),
      require("@babel/plugin-transform-exponentiation-operator"),
      require("@babel/plugin-proposal-async-generator-functions"),
      // require("@babel/plugin-transform-async-to-generator"),
    ]
  };
};

// Minimum versions if we compile async functions to wrapped generator
// functions (which necessitates the classes transform because of a bug
// with async methods):
exports.minimumVersions = {
  chrome: 49,
  edge: 13,
  firefox: 46,
  mobile_safari: 10,
  node: 8,
  opera: 38,
  safari: 10
};

// Minimum versions if we assume native support for async functions.
// Amazingly, this accounts for 70%+ of internet users!
// https://caniuse.com/#feat=async-functions
exports.minimumVersions = {
  chrome: 55,
  edge: 15,
  firefox: 52,
  mobile_safari: [10, 3],
  node: 8,
  opera: 42,
  safari: [10, 1]
};