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

'use strict';

var supportsDescriptors = require('define-properties').supportsDescriptors;
var functionsHaveNames = require('functions-have-names')();
var getPolyfill = require('./polyfill');
var defineProperty = Object.defineProperty;
var TypeErr = TypeError;

module.exports = function shimName() {
        var polyfill = getPolyfill();
        if (functionsHaveNames) {
                return polyfill;
        }
        if (!supportsDescriptors) {
                throw new TypeErr('Shimming Function.prototype.name support requires ES5 property descriptor support.');
        }
        var functionProto = Function.prototype;
        defineProperty(functionProto, 'name', {
                configurable: true,
                enumerable: false,
                get: function () {
                        var name = polyfill.call(this);
                        if (this !== functionProto) {
                                defineProperty(this, 'name', {
                                        configurable: true,
                                        enumerable: false,
                                        value: name,
                                        writable: false
                                });
                        }
                        return name;
                }
        });
        return polyfill;
};