source: imaps-frontend/node_modules/array.prototype.flatmap/implementation.js

'use strict';

var ArraySpeciesCreate = require('es-abstract/2023/ArraySpeciesCreate');
var FlattenIntoArray = require('es-abstract/2023/FlattenIntoArray');
var Get = require('es-abstract/2023/Get');
var IsCallable = require('es-abstract/2023/IsCallable');
var ToLength = require('es-abstract/2023/ToLength');
var ToObject = require('es-abstract/2023/ToObject');

module.exports = function flatMap(mapperFunction) {
        var O = ToObject(this);
        var sourceLen = ToLength(Get(O, 'length'));

        if (!IsCallable(mapperFunction)) {
                throw new TypeError('mapperFunction must be a function');
        }

        var T;
        if (arguments.length > 1) {
                T = arguments[1];
        }

        var A = ArraySpeciesCreate(O, 0);
        FlattenIntoArray(A, O, sourceLen, 0, 1, mapperFunction, T);
        return A;
};