jsoneo/es/utils/pickPrototype.js

A powerful JSON enhancement library that supports all JSON primitives, Date, RegExp, Symbol, Functions, Map, Set, TypedArray and much more! Almost everything in JavaScript.

import { TypedArrays } from "./binary.js";
import { getFullKeys } from "./get.js";

/**
 * Picks all prototype properties from the source object, including those from its prototype chain.
 *
 * @param source - The source object to pick properties from.
 * @param options - Options to control the behavior of the picking.
 */
export function pickPrototype(
// eslint-disable-next-line @typescript-eslint/no-explicit-any
source, options) {
  const {
    preserveClassConstructor = true,
    debug
  } = options ?? {};
  // eslint-disable-next-line @typescript-eslint/no-explicit-any
  const target = Object.create(null);
  const ignoredKeys = [preserveClassConstructor ? undefined : 'constructor'].filter(Boolean);
  let proto = Object.getPrototypeOf(source);
  while (proto != null && proto !== Object.prototype && proto !== Array.prototype && proto !== Function.prototype && proto !== Map.prototype && proto !== Set.prototype && proto !== ArrayBuffer.prototype && proto !== DataView.prototype && !TypedArrays.some(t => proto === t.prototype) && (typeof Buffer === 'undefined' || proto !== Buffer.prototype)) {
    const protoKeys = getFullKeys(proto);
    for (const key of protoKeys) {
      if (!(key in target) && !ignoredKeys.includes(key)) {
        try {
          // should use source[key] instead of proto[key], because the member may be a getter which
          // relies on some other members of source object
          target[key] = source[key];
        } catch (error) {
          if (debug) {
            console.warn('Error in expanding prototype chain:', error);
            console.log('key:', key);
            console.log('source:', source);
          }
        }
      }
    }
    proto = Object.getPrototypeOf(proto);
  }
  return target;
}
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