/**
 * Permission Engine — Evaluates action permissions.
 *
 * Pure function. Implements the NEVER-HIDE invariant: permissions disable UI
 * elements, never remove them from the DOM.
 *
 * @module permissionEngine
 * @see FMPV-MVWC-E001-S004, FR-FMPV-055
 */
import type { MasterPatternViewPermissions } from '../types';
/**
 * Checks if an action is allowed based on permissions.
 *
 * When `permissions` is `undefined`, all actions default to `true` (per PRD §9).
 * When a specific permission key is `undefined`, it defaults to `true`.
 *
 * @param permissions - Permission configuration (or undefined for all-allowed)
 * @param operation - The operation to check
 * @param masterType - The master type context (for future type-specific logic)
 * @returns true if the action is allowed
 */
export declare function isActionAllowed(permissions: MasterPatternViewPermissions | undefined, operation: string, masterType: string): boolean;
/**
 * Returns the warning message for a disabled action (NEVER-HIDE toast).
 *
 * @param operation - The operation that is disabled
 * @returns A user-friendly message explaining the restriction
 */
export declare function getDisabledToastMessage(operation: string): string;
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