import type { Hash } from "./types.js";
/**
 * Maximum number of historical values retained per (variable_name, variable_schema).
 * Position 0 is current; positions 1..MAX_HISTORY-1 are previous values (LRU).
 */
export declare const MAX_HISTORY = 10;
/**
 * Custom error types for variable operations
 */
export declare class VariableNotFoundError extends Error {
    variableName: string;
    variableSchema: Hash;
    constructor(variableName: string, variableSchema: Hash);
}
export declare class InvalidVariableNameError extends Error {
    variableName: string;
    reason: string;
    constructor(variableName: string, reason: string);
}
export declare class SchemaMismatchError extends Error {
    expected: string;
    actual: string;
    constructor(expected: string, actual: string);
}
export declare class CasNodeNotFoundError extends Error {
    readonly hash: string;
    constructor(hash: string, message?: string);
}
export declare class TagLabelConflictError extends Error {
    conflictName: string;
    existingType: "tag" | "label";
    attemptedType: "tag" | "label";
    constructor(conflictName: string, existingType: "tag" | "label", attemptedType: "tag" | "label");
}
export declare class InvalidTagFormatError extends Error {
    constructor(tag: string);
}
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