class MessagePartTypeEnum {}

Source

class MessagePartTypeEnum extends AbstractEnum
{
    /**
     * Text content.
     */
    public const TEXT = 'text';
    /**
     * File content (inline or remote).
     */
    public const FILE = 'file';
    /**
     * Function call request.
     */
    public const FUNCTION_CALL = 'function_call';
    /**
     * Function response.
     */
    public const FUNCTION_RESPONSE = 'function_response';
}

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