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node_modules/is-generator-function/index.js

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+'use strict';
+
+var callBound = require('call-bound');
+var safeRegexTest = require('safe-regex-test');
+var isFnRegex = safeRegexTest(/^\s*(?:function)?\*/);
+var hasToStringTag = require('has-tostringtag/shams')();
+var getProto = require('get-proto');
+
+var toStr = callBound('Object.prototype.toString');
+var fnToStr = callBound('Function.prototype.toString');
+
+var getGeneratorFunc = function () { // eslint-disable-line consistent-return
+	if (!hasToStringTag) {
+		return false;
+	}
+	try {
+		return Function('return function*() {}')();
+	} catch (e) {
+	}
+};
+/** @type {undefined | false | null | GeneratorFunctionConstructor} */
+var GeneratorFunction;
+
+/** @type {import('.')} */
+module.exports = function isGeneratorFunction(fn) {
+	if (typeof fn !== 'function') {
+		return false;
+	}
+	if (isFnRegex(fnToStr(fn))) {
+		return true;
+	}
+	if (!hasToStringTag) {
+		var str = toStr(fn);
+		return str === '[object GeneratorFunction]';
+	}
+	if (!getProto) {
+		return false;
+	}
+	if (typeof GeneratorFunction === 'undefined') {
+		var generatorFunc = getGeneratorFunc();
+		GeneratorFunction = generatorFunc
+			// eslint-disable-next-line no-extra-parens
+			? /** @type {GeneratorFunctionConstructor} */ (getProto(generatorFunc))
+			: false;
+	}
+	return getProto(fn) === GeneratorFunction;
+};