32 lines
860 B
JavaScript
32 lines
860 B
JavaScript
'use strict';
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var callBound = require('call-bound');
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var safeRegexTest = require('safe-regex-test');
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var isFnRegex = safeRegexTest(/^\s*(?:function)?\*/);
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var hasToStringTag = require('has-tostringtag/shams')();
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var getProto = require('get-proto');
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var toStr = callBound('Object.prototype.toString');
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var fnToStr = callBound('Function.prototype.toString');
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var getGeneratorFunction = require('generator-function');
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/** @type {import('.')} */
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module.exports = function isGeneratorFunction(fn) {
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if (typeof fn !== 'function') {
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return false;
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}
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if (isFnRegex(fnToStr(fn))) {
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return true;
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}
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if (!hasToStringTag) {
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var str = toStr(fn);
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return str === '[object GeneratorFunction]';
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}
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if (!getProto) {
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return false;
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}
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var GeneratorFunction = getGeneratorFunction();
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return GeneratorFunction && getProto(fn) === GeneratorFunction.prototype;
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};
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