/**
 * Durable Mission Graph — human approval gates & external blockers (2.0.0).
 *
 * Human approval nodes cannot be auto-approved. A decision is only valid when
 * granted by a verified principal listed on the gate, for the gate's scope,
 * before its expiry. External blockers require concrete evidence to be marked
 * satisfied — satisfaction cannot be fabricated.
 */
import type { ApprovalDecision, ApprovalGateSpec, ExternalBlockerSpec, ExternalBlockerState, MissionOperationResult } from "./types.js";
export interface ApproveInput {
    gate: ApprovalGateSpec;
    /** Objective attempting the approval (for no-self-approval scope check). */
    objectiveId: string;
    principal: string;
    approved: boolean;
    nowMs: number;
    reason?: string;
}
export type ValidateResult<T> = MissionOperationResult<T>;
/**
 * Evaluate an approval decision request against a gate.
 *
 * Rejections:
 *  - SELF_APPROVAL when the objective approves its own gate
 *  - APPROVAL_NOT_GRANTED when the principal is not required/listed
 *  - APPROVAL_EXPIRED when ttlMs is set and nowMs exceeds expiry window
 */
export declare function evaluateApproval(input: ApproveInput): ValidateResult<ApprovalDecision>;
/**
 * Determine whether a previously recorded approval decision is still valid now:
 * it must be approved, granted by a listed principal, and not expired.
 */
export declare function isApprovalValid(gate: ApprovalGateSpec, decision: ApprovalDecision, nowMs: number): boolean;
/**
 * Mark an external blocker satisfied given evidence.
 *
 * Rejections:
 *  - BLOCKER_WITHOUT_EVIDENCE when no evidence reference is provided
 *  - BLOCKER_UNSATISFIED when the evidence reference is not in `satisfiedOn`
 *
 * Satisfaction can only come from a concrete evidence reference listed on the
 * spec — it cannot be fabricated.
 */
export declare function satisfyExternalBlocker(spec: ExternalBlockerSpec, evidenceReference: string | undefined, nowMs?: number): ValidateResult<ExternalBlockerState>;
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