How to use the @sanity/util/paths.toString function in @sanity/util

}

  if (!isPlainObject(value)) {
    return value
  }

  // Apply missing keys is the parent is an array
  const initial: {[key: string]: any} = parentIsArray && !value._key ? {_key: randomKey()} : {}

  // Ensure non-root objects have _type
  if (path.length > 0 && !value._type) {
    if (value._ref) {
      // In the case of references, we know what the type should be, so apply it
      initial._type = 'reference'
    } else {
      throw new Error(`missing "_type" property at path "${pathToString(path)}"`)
    }
  }

  if (value._ref) {
    validateReference(value, path)
  }

  // Validate deeply
  return Object.keys(value).reduce((acc, key) => {
    acc[key] = validateValue(value[key], path.concat([key]))
    return acc
  }, initial)
}

function validateReference(value, path: (string | number)[] = []) {
  if (!value._type && value.type) {
    throw new Error(
      `Reference is missing "_type", but has a "type" property at path "${pathToString(path)}"`
    )
  }

  const disallowed = Object.keys(value).filter(key => !ALLOWED_REF_PROPS.includes(key))
  if (disallowed.length > 0) {
    const plural = disallowed.length > 1 ? 'properties' : 'property'
    throw new Error(
      `Disallowed ${plural} found in reference: ${disallowed
        .map(quote)
        .join(', ')} at path "${pathToString(path)}"`
    )
  }
}

return value.map((item, i) => {
      if (Array.isArray(item)) {
        throw new Error(
          `multidimensional arrays are not supported (at path "${pathToString(path)}")`
        )
      }

      return validateValue(item, path.concat(i), true)
    })
  }

function validateReference(value, path: (string | number)[] = []) {
  if (!value._type && value.type) {
    throw new Error(
      `Reference is missing "_type", but has a "type" property at path "${pathToString(path)}"`
    )
  }

  const disallowed = Object.keys(value).filter(key => !ALLOWED_REF_PROPS.includes(key))
  if (disallowed.length > 0) {
    const plural = disallowed.length > 1 ? 'properties' : 'property'
    throw new Error(
      `Disallowed ${plural} found in reference: ${disallowed
        .map(quote)
        .join(', ')} at path "${pathToString(path)}"`
    )
  }
}