import type { END, START } from "../../constants";
/**
 * Represents an access control list for a stream.
 */
export interface StreamACL {
    /**
     * Roles and users permitted to read the stream.
     */
    readRoles?: string[];
    /**
     * Roles and users permitted to write to the stream.
     */
    writeRoles?: string[];
    /**
     * Roles and users permitted to delete the stream.
     */
    deleteRoles?: string[];
    /**
     * Roles and users permitted to read stream metadata.
     */
    metaReadRoles?: string[];
    /**
     * Roles and users permitted to write stream metadata.
     */
    metaWriteRoles?: string[];
}
export interface SystemStreamMetadata {
    /**
     * The optional maximum age (in seconds) of events allowed in the stream.
     */
    maxAge?: number;
    /**
     * The optional streamPositon from which previous events can be scavenged.
     * This is used to implement soft-deletion of streams.
     */
    truncateBefore?: typeof START | typeof END | number;
    /**
     * The optional amount of time (in seconds) for which the stream head is cacheable.
     */
    cacheControl?: number;
    /**
     * The optional ACL for the stream.
     */
    acl?: StreamACL;
    /**
     * The optional maximum number of events allowed in the stream.
     */
    maxCount?: number;
}
export type CustomStreamMetadata = Record<string | number, unknown>;
export type StreamMetadata<CustomMetadata extends CustomStreamMetadata = CustomStreamMetadata> = SystemStreamMetadata & CustomMetadata;
export declare const prepareStreamMetadata: <CustomMetadata extends CustomStreamMetadata = CustomStreamMetadata>(metadata: StreamMetadata<CustomMetadata>) => Record<string, unknown>;
export declare const readStreamMetadata: <CustomMetadata extends CustomStreamMetadata = CustomStreamMetadata>(metadata: Record<string, unknown>) => StreamMetadata<CustomMetadata>;