Function create

packages/angular_devkit/core/src/workspace/json/utilities.ts:60–152

(
  obj: JsonObject | JsonArray,
  path: string[],
  reporter: ChangeReporter,
  excluded = new Set<ProxyPropertyKey>(),
  included?: Set<ProxyPropertyKey>,
)

}

function create(
  obj: JsonObject | JsonArray,
  path: string[],
  reporter: ChangeReporter,
  excluded = new Set<ProxyPropertyKey>(),
  included?: Set<ProxyPropertyKey>,
) {
  return new Proxy(obj, {
    getOwnPropertyDescriptor(target: {}, p: ProxyPropertyKey): PropertyDescriptor | undefined {
      if (excluded.has(p) || (included && !included.has(p))) {
        return undefined;
      }

      return Reflect.getOwnPropertyDescriptor(target, p);
    },
    has(target: {}, p: ProxyPropertyKey): boolean {
      if (typeof p === 'symbol' || excluded.has(p)) {
        return false;
      }

      return Reflect.has(target, p);
    },
    get(target: {}, p: ProxyPropertyKey): unknown {
      if (excluded.has(p) || (included && !included.has(p))) {
        return undefined;
      }

      const value = Reflect.get(target, p);
      if (typeof p === 'symbol') {
        return value;
      }

      if ((isJsonObject(value) && !(value instanceof Map)) || Array.isArray(value)) {
        return create(value, [...path, p], reporter);
      } else {
        return value;
      }
    },
    set(target: {}, p: ProxyPropertyKey, value: unknown): boolean {
      if (excluded.has(p) || (included && !included.has(p))) {
        return false;
      }

      if (value === undefined) {
        // setting to undefined is equivalent to a delete.
        return this.deleteProperty?.(target, p) ?? false;
      }

      if (typeof p === 'symbol') {
        return Reflect.set(target, p, value);
      }

      const existingValue = getCurrentValue(target, p);
      if (Reflect.set(target, p, value)) {
        reporter([...path, p], target, existingValue, value as JsonValue);

        return true;
      }