polyfill.js

/*!
  * KUTE.js Polyfill v2.1.1-alpha1 (http://thednp.github.io/kute.js)
  * Copyright 2015-2021 © thednp
  * Licensed under MIT (https://github.com/thednp/bootstrap.native/blob/master/LICENSE)
  */
 "use strict";
if (!Array.from) {
  Array.from = (function () {
    var toStr = Object.prototype.toString;
    var isCallable = function (fn) {
      return typeof fn === 'function' || toStr.call(fn) === '[object Function]';
    };
    var toInteger = function (value) {
      var number = Number(value);
      if (isNaN(number)) { return 0; }
      if (number === 0 || !isFinite(number)) { return number; }
      return (number > 0 ? 1 : -1) * Math.floor(Math.abs(number));
    };
    var maxSafeInteger = Math.pow(2, 53) - 1;
    var toLength = function (value) {
      var len = toInteger(value);
      return Math.min(Math.max(len, 0), maxSafeInteger);
    };

    return function from(arrayLike/*, mapFn, thisArg */) {
      var C = this, items = Object(arrayLike);
      if (arrayLike == null) {
        throw new TypeError('Array.from requires an array-like object - not null or undefined');
      }
      var mapFn = arguments.length > 1 ? arguments[1] : void undefined, T;
      if (typeof mapFn !== 'undefined') {
        if (!isCallable(mapFn)) {
          throw new TypeError('Array.from: when provided, the second argument must be a function');
        }

        if (arguments.length > 2) {
          T = arguments[2];
        }
      }
      var len = toLength(items.length);
      var A = isCallable(C) ? Object(new C(len)) : new Array(len);

      var k = 0;
      var kValue;
      while (k < len) {
        kValue = items[k];
        if (mapFn) {
          A[k] = typeof T === 'undefined' ? mapFn(kValue, k) : mapFn.call(T, kValue, k);
        } else {
          A[k] = kValue;
        }
        k += 1;
      }
      A.length = len;
      return A;
    }
  }());
}

// https://github.com/jonathantneal/array-flat-polyfill/blob/master/src/polyfill-flat.js

if (!Array.prototype.flat) {
	Object.defineProperty(Array.prototype, 'flat', {
		configurable: true,
		value: function flat () {
			var depth = isNaN(arguments[0]) ? 1 : Number(arguments[0]);

			return depth ? Array.prototype.reduce.call(this, function (acc, cur) {
				if (Array.isArray(cur)) {
					acc.push.apply(acc, flat.call(cur, depth - 1));
				} else {
					acc.push(cur);
				}

				return acc;
			}, []) : Array.prototype.slice.call(this);
		},
		writable: true
	});
}

if (!Array.prototype.includes) {
  Array.prototype.includes = function(searchElement /*, fromIndex*/ ) {
    var O = Object(this);
    var len = parseInt(O.length) || 0;
    if (len === 0) {
      return false;
    }
    var n = parseInt(arguments[1]) || 0;
    var k;
    if (n >= 0) {
      k = n;
    } else {
      k = len + n;
      if (k < 0) {k = 0;}
    }
    var currentElement;
    while (k < len) {
      currentElement = O[k];
      if (searchElement === currentElement ||
         (searchElement !== searchElement && currentElement !== currentElement)) {
        return true;
      }
      k++;
    }
    return false;
  };
}

if (!String.prototype.includes) {
  String.prototype.includes = function(search, start) {
    if (search instanceof RegExp) {
      throw TypeError('first argument must not be a RegExp');
    } 
    if (start === undefined) { start = 0; }
    return this.indexOf(search, start) !== -1;
  };
}

if (!Number.isFinite) {
  Number.isFinite = function(value) {
    return typeof value === 'number'
      && isFinite(value);
  };
}

if (!Number.isInteger) {
  Number.isInteger = function(value) {
    return typeof value === 'number'
      && isFinite(value)
      && Math.floor(value) === value;
  };
}

if (!Number.isNaN) {
  Number.isNaN = function(value) {
    return typeof value === 'number'
      && value !== value;
  };
}