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'use strict';
var $ = require('../internals/export');
var flattenIntoArray = require('../internals/flatten-into-array');
var toObject = require('../internals/to-object');
var lengthOfArrayLike = require('../internals/length-of-array-like');
var toIntegerOrInfinity = require('../internals/to-integer-or-infinity');
var arraySpeciesCreate = require('../internals/array-species-create');
// `Array.prototype.flat` method
// https://tc39.es/ecma262/#sec-array.prototype.flat
$({ target: 'Array', proto: true }, {
flat: function flat(/* depthArg = 1 */) {
var depthArg = arguments.length ? arguments[0] : undefined;
var O = toObject(this);
var sourceLen = lengthOfArrayLike(O);
var A = arraySpeciesCreate(O, 0);
A.length = flattenIntoArray(A, O, O, sourceLen, 0, depthArg === undefined ? 1 : toIntegerOrInfinity(depthArg));
return A;
}
});