/**
 * action_ref atomic primitive.
 *
 * action_ref = SHA-256(JCS({agent_id, action_type, scope, timestamp_ms}))
 *
 * The action_ref is the AlgoVoi-authored canonical action identifier used
 * across the substrate. Two emitters describing the same logical action
 * produce the same action_ref by construction.
 *
 * - timestamp_ms is enforced as an epoch-millisecond integer per Substrate
 *   Rule 1. Float, ISO 8601 strings, and negative values are rejected.
 * - agent_id, action_type, scope are required non-empty strings.
 * - The preimage shape is fixed at exactly these four fields.
 */
export declare class ActionRefError extends Error {
    constructor(message: string);
}
export interface ActionRefObject {
    agent_id: string;
    action_type: string;
    scope: string;
    timestamp_ms: number;
}
export interface ActionRefInput {
    agent_id: string;
    action_type: string;
    scope: string;
    timestamp_ms: number;
}
/**
 * Return the validated preimage object for action_ref.
 *
 * The four-field shape is fixed by the substrate; extending it produces
 * a different primitive, not a different action_ref.
 */
export declare function actionRefObject(input: ActionRefInput): ActionRefObject;
/**
 * Return the lowercase hex SHA-256 action_ref.
 *
 * action_ref = SHA-256(JCS({agent_id, action_type, scope, timestamp_ms}))
 *
 * Output is plain hex (no algorithm prefix).
 */
export declare function actionRef(input: ActionRefInput): string;
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