E0234: 'protected' is not allowed in JavaScript

JavaScript does not support protected properties. It is a syntax error to declare a class property as protected:

class ObjectPool {
  protected makeImpl() {
    return {};
  }
}

class NodePool extends ObjectPool {
  protected makeImpl() {
    return new Node(null);
  }
}

To fix this error, remove the protected keyword, and consider putting a _ prefix in the property name to signal it should not be called outside the class:

class ObjectPool {
  _makeImpl() {
    return {};
  }
}

class NodePool extends ObjectPool {
  _makeImpl() {
    return new Node(null);
  }
}

Introduced in quick-lint-js version 2.6.0.

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