How to use the @remirror/core-helpers.isObject function in @remirror/core-helpers

export const isHSL = (value: unknown): value is HSL =>
  isObject(value) && value.constructor && (value.constructor as any).$$id === HSL_SYMBOL;

export const isObjectNode = (value: unknown): value is ObjectNode =>
  isObject(value) && (value as PlainObject).type === 'doc' && Array.isArray((value as PlainObject).content);

export const isNodeSelection = (
  value: unknown,
): value is NodeSelection => isObject(value) && value instanceof NodeSelection;

export const isExtension = (extension: unknown): extension is AnyExtension =>
  isObject(extension) && extension.toString() === RemirrorClassName.Extension;

export const isValidElement = (value: unknown): value is ReactElement =>
  isObject(value) && reactIsValidElement(value);

export const isRemirrorElement = (
  value: unknown,
): value is RemirrorElement => {
  return bool(
    isObject(value) &&
      isValidElement(value) &&
      (value.type as RemirrorComponentType).$$remirrorType,
  );
};