Protocol for extracting minimal information from exceptions for RPC responses.

Similar to AshGraphql.Error, this protocol transforms various error types into a standardized format with only the essential information needed by TypeScript clients.

Error Format

Each implementation should return a map with these fields:

• :message - The full error message (may contain template variables like %{key})
• :short_message - A concise version of the message
• :type - A machine-readable error type (e.g., "invalid_changes", "not_found")
• :vars - A map of variables to interpolate into messages
• :fields - A list of affected field names (for field-level errors)
• :path - The path to the error location in the data structure
• :details - An optional map with extra details

Example Implementation

defimpl AshTypescript.Rpc.Error, for: MyApp.CustomError do
  def to_error(error) do
    %{
      message: error.message,
      short_message: "Custom error occurred",
      type: "custom_error",
      vars: %{detail: error.detail},
      fields: [],
      path: error.path || []
    }
  end
end