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Editing: implementation.js

'use strict';

var IsCallable = require('es-abstract/2021/IsCallable');
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 classRegex = /^class /;

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

var functionProto = Function.prototype;

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

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