moltres-utils/dist/data/isGeneratorFunction.js

Utils for Moltres apps

"use strict";

Object.defineProperty(exports, "__esModule", {
  value: true
});
exports.default = void 0;
const toStr = Object.prototype.toString;
const fnToStr = Function.prototype.toString;
const isFnRegex = /^\s*(?:function)?\*/;
const hasToStringTag = typeof Symbol === 'function' && typeof Symbol.toStringTag === 'symbol';
const getProto = Object.getPrototypeOf;

const getGeneratorFunc = () => {
  // eslint-disable-line consistent-return
  if (!hasToStringTag) {
    return false;
  }

  try {
    return Function('return function*() {}')();
  } catch (e) {}
};

const generatorFunc = getGeneratorFunc();
const GeneratorFunction = generatorFunc ? getProto(generatorFunc) : {};

const isGeneratorFunction = fn => {
  if (typeof fn !== 'function') {
    return false;
  }

  if (isFnRegex.test(fnToStr.call(fn))) {
    return true;
  }

  if (!hasToStringTag) {
    const str = toStr.call(fn);
    return str === '[object GeneratorFunction]';
  }

  return getProto(fn) === GeneratorFunction;
};

var _default = isGeneratorFunction;
exports.default = _default;
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