33 lines
830 B
Plaintext
33 lines
830 B
Plaintext
'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 toStr = callBound('Object.prototype.toString');
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var fnToStr = callBound('Function.prototype.toString');
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var isFnRegex = safeRegexTest(/^\s*async(?:\s+function(?:\s+|\()|\s*\()/);
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var hasToStringTag = require('has-tostringtag/shams')();
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var getProto = require('get-proto');
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var getAsyncFunc = require('async-function');
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/** @type {import('.')} */
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module.exports = function isAsyncFunction(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 AsyncFunction]';
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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 asyncFunc = getAsyncFunc();
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return asyncFunc && asyncFunc.prototype === getProto(fn);
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};
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