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rOACCT/node_modules/core-js/internals/flatten-into-array.js
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flatten-into-array.js
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			'use strict';
			var isArray = require('../internals/is-array');
			var lengthOfArrayLike = require('../internals/length-of-array-like');
			var doesNotExceedSafeInteger = require('../internals/does-not-exceed-safe-integer');
			var bind = require('../internals/function-bind-context');

			// `FlattenIntoArray` abstract operation
			// https://tc39.github.io/proposal-flatMap/#sec-FlattenIntoArray
			var flattenIntoArray = function (target, original, source, sourceLen, start, depth, mapper, thisArg) {
			var targetIndex = start;
			var sourceIndex = 0;
			var mapFn = mapper ? bind(mapper, thisArg) : false;
			var element, elementLen;

			while (sourceIndex < sourceLen) {
			if (sourceIndex in source) {
			element = mapFn ? mapFn(source[sourceIndex], sourceIndex, original) : source[sourceIndex];

			if (depth > 0 && isArray(element)) {
			elementLen = lengthOfArrayLike(element);
			targetIndex = flattenIntoArray(target, original, element, elementLen, targetIndex, depth - 1) - 1;
			} else {
			doesNotExceedSafeInteger(targetIndex + 1);
			target[targetIndex] = element;
			}

			targetIndex++;
			}
			sourceIndex++;
			}
			return targetIndex;
			};

			module.exports = flattenIntoArray;