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node_modules/is-async-function/index.js

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+'use strict';
+
+var callBound = require('call-bound');
+var safeRegexTest = require('safe-regex-test');
+
+var toStr = callBound('Object.prototype.toString');
+var fnToStr = callBound('Function.prototype.toString');
+var isFnRegex = safeRegexTest(/^\s*async(?:\s+function(?:\s+|\()|\s*\()/);
+
+var hasToStringTag = require('has-tostringtag/shams')();
+var getProto = require('get-proto');
+
+var getAsyncFunc = require('async-function');
+
+/** @type {import('.')} */
+module.exports = function isAsyncFunction(fn) {
+	if (typeof fn !== 'function') {
+		return false;
+	}
+	if (isFnRegex(fnToStr(fn))) {
+		return true;
+	}
+	if (!hasToStringTag) {
+		var str = toStr(fn);
+		return str === '[object AsyncFunction]';
+	}
+	if (!getProto) {
+		return false;
+	}
+	var asyncFunc = getAsyncFunc();
+	return asyncFunc && asyncFunc.prototype === getProto(fn);
+};