private _getSlots()

in packages/jest-mock/src/index.ts [495:539]
34 lines of code
14 McCabe index (conditional complexity)

  private _getSlots(object?: Record<string, any>): Array<string> {
    if (!object) {
      return [];
    }

    const slots = new Set<string>();
    const EnvObjectProto = this._environmentGlobal.Object.prototype;
    const EnvFunctionProto = this._environmentGlobal.Function.prototype;
    const EnvRegExpProto = this._environmentGlobal.RegExp.prototype;

    // Also check the builtins in the current context as they leak through
    // core node modules.
    const ObjectProto = Object.prototype;
    const FunctionProto = Function.prototype;
    const RegExpProto = RegExp.prototype;

    // Properties of Object.prototype, Function.prototype and RegExp.prototype
    // are never reported as slots
    while (
      object != null &&
      object !== EnvObjectProto &&
      object !== EnvFunctionProto &&
      object !== EnvRegExpProto &&
      object !== ObjectProto &&
      object !== FunctionProto &&
      object !== RegExpProto
    ) {
      const ownNames = Object.getOwnPropertyNames(object);

      for (let i = 0; i < ownNames.length; i++) {
        const prop = ownNames[i];

        if (!isReadonlyProp(object, prop)) {
          const propDesc = Object.getOwnPropertyDescriptor(object, prop);
          if ((propDesc !== undefined && !propDesc.get) || object.__esModule) {
            slots.add(prop);
          }
        }
      }

      object = Object.getPrototypeOf(object);
    }

    return Array.from(slots);
  }