/**
 * @fileoverview Read Concern Levels for Block Retrieval
 *
 * Controls how the system handles blocks not available locally
 * during cross-node read operations.
 *
 * @see cross-node-eventual-consistency design, ReadConcern section
 * @see Requirements 2.1
 */
/**
 * Read concern levels for block retrieval.
 * Controls how the system handles blocks not available locally.
 */
export declare enum ReadConcern {
    /** Return only locally available blocks. Fail for remote/unknown blocks. */
    Local = "local",
    /** Return local blocks immediately; attempt remote fetch but return pending indicator on timeout. */
    Available = "available",
    /** Block until the block is fetched or timeout is reached. */
    Consistent = "consistent"
}
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