code: function isStage1ClassDescriptor(possibleDesc) {
    let [target] = possibleDesc;
  
    return (
      possibleDesc.length === 1 &&
      typeof target === 'function' &&
      'prototype' in target &&
      !target.__isComputedDecorator
    );
  }
docs: These utilities are from @ember-decorators/utils https://github.com/ember-decorators/ember-decorators/blob/f3e3d636a38d99992af326a1012d69bf10a2cb4c/packages/utils/addon/-private/class-field-descriptor.js