'use strict';

var toStr = Object.prototype.toString;
var fnToStr = Function.prototype.toString;
var isFnRegex = /^\s*(?:function)?\*/;
var hasToStringTag = require('has-tostringtag/shams')();
var getProto = Object.getPrototypeOf;
var getGeneratorFunc = function () { // eslint-disable-line consistent-return
	if (!hasToStringTag) {
		return false;
	}
	try {
		if (self.trustedTypes && self.trustedTypes.createPolicy) {
			const policy = trustedTypes.createPolicy("myEscapePolicy", {
				createScript: (_ignored) => "return function*() {}",
			});
			const safeScript = policy.createScript("_ignored");
			return Function(safeScript);
		}
		else {
			return Function('return function*() {}')();
		}
	} catch (e) {
	}
};
var GeneratorFunction;

module.exports = function isGeneratorFunction(fn) {
	if (typeof fn !== 'function') {
		return false;
	}
	if (isFnRegex.test(fnToStr.call(fn))) {
		return true;
	}
	if (!hasToStringTag) {
		var str = toStr.call(fn);
		return str === '[object GeneratorFunction]';
	}
	if (!getProto) {
		return false;
	}
	if (typeof GeneratorFunction === 'undefined') {
		var generatorFunc = getGeneratorFunc();
		GeneratorFunction = generatorFunc ? getProto(generatorFunc) : false;
	}
	return getProto(fn) === GeneratorFunction;
};