source: imaps-frontend/node_modules/function.prototype.name/implementation.js

'use strict';

var IsCallable = require('es-abstract/2023/IsCallable');
var HasOwnProperty = require('es-abstract/2023/HasOwnProperty');
var functionsHaveNames = require('functions-have-names')();
var callBound = require('call-bind/callBound');
var $functionToString = callBound('Function.prototype.toString');
var $stringMatch = callBound('String.prototype.match');
var toStr = callBound('Object.prototype.toString');

var classRegex = /^class /;

var isClass = function isClassConstructor(fn) {
        if (IsCallable(fn)) {
                return false;
        }
        if (typeof fn !== 'function') {
                return false;
        }
        try {
                var match = $stringMatch($functionToString(fn), classRegex);
                return !!match;
        } catch (e) {}
        return false;
};

var regex = /\s*function\s+([^(\s]*)\s*/;

var isIE68 = !(0 in [,]); // eslint-disable-line no-sparse-arrays, comma-spacing

var objectClass = '[object Object]';
var ddaClass = '[object HTMLAllCollection]';

var functionProto = Function.prototype;

var isDDA = function isDocumentDotAll() {
        return false;
};
if (typeof document === 'object') {
        // Firefox 3 canonicalizes DDA to undefined when it's not accessed directly
        var all = document.all;
        if (toStr(all) === toStr(document.all)) {
                isDDA = function isDocumentDotAll(value) {
                        /* globals document: false */
                        // in IE 6-8, typeof document.all is "object" and it's truthy
                        if ((isIE68 || !value) && (typeof value === 'undefined' || typeof value === 'object')) {
                                try {
                                        var str = toStr(value);
                                        // IE 6-8 uses `objectClass`
                                        return (str === ddaClass || str === objectClass) && value('') == null; // eslint-disable-line eqeqeq
                                } catch (e) { /**/ }
                        }
                        return false;
                };
        }
}

module.exports = function getName() {
        if (isDDA(this) || (!isClass(this) && !IsCallable(this))) {
                throw new TypeError('Function.prototype.name sham getter called on non-function');
        }
        if (functionsHaveNames && HasOwnProperty(this, 'name')) {
                return this.name;
        }
        if (this === functionProto) {
                return '';
        }
        var str = $functionToString(this);
        var match = $stringMatch(str, regex);
        var name = match && match[1];
        return name;
};