bootstrap-vue/es/utils/object.js

BootstrapVue provides one of the most comprehensive implementations of Bootstrap 4 components and grid system for Vue.js and with extensive and automated WAI-ARIA accessibility markup.

/**
 * Aliasing Object[method] allows the minifier to shorten methods to a single character variable,
 * as well as giving BV a chance to inject polyfills.
 * As long as we avoid
 * - import * as Object from "utils/object"
 * all unused exports should be removed by tree-shaking.
 */

// @link https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/assign
if (typeof Object.assign !== 'function') {
  Object.assign = function (target, varArgs) {
    // .length of function is 2

    if (target == null) {
      // TypeError if undefined or null
      throw new TypeError('Cannot convert undefined or null to object');
    }

    var to = Object(target);

    for (var index = 1; index < arguments.length; index++) {
      var nextSource = arguments[index];

      if (nextSource != null) {
        // Skip over if undefined or null
        for (var nextKey in nextSource) {
          // Avoid bugs when hasOwnProperty is shadowed
          if (Object.prototype.hasOwnProperty.call(nextSource, nextKey)) {
            to[nextKey] = nextSource[nextKey];
          }
        }
      }
    }
    return to;
  };
}

// @link https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/is#Polyfill
if (!Object.is) {
  Object.is = function (x, y) {
    // SameValue algorithm
    if (x === y) {
      // Steps 1-5, 7-10
      // Steps 6.b-6.e: +0 != -0
      return x !== 0 || 1 / x === 1 / y;
    } else {
      // Step 6.a: NaN == NaN
      // eslint-disable-next-line no-self-compare
      return x !== x && y !== y;
    }
  };
}

export var assign = Object.assign;
export var getOwnPropertyNames = Object.getOwnPropertyNames;
export var keys = Object.keys;
export var defineProperties = Object.defineProperties;
export var defineProperty = Object.defineProperty;
export var freeze = Object.freeze;
export var getOwnPropertyDescriptor = Object.getOwnPropertyDescriptor;
export var getOwnPropertySymbols = Object.getOwnPropertySymbols;
export var getPrototypeOf = Object.getPrototypeOf;
export var create = Object.create;
export var isFrozen = Object.isFrozen;
export var is = Object.is;

export function readonlyDescriptor() {
  return { enumerable: true, configurable: false, writable: false };
}