/**
 * Rule Host Evaluator �?Pure decision merge logic
 *
 * PURPOSE: Iterate loaded code implementations and merge their decisions.
 * Block short-circuits, auto_correct collects (validated), requireApproval
 * collects, allow is implicit.
 *
 * Precedence: block > auto_correct > requireApproval > allow
 *
 * PRI-45: Pure function extracted from the plugin's RuleHost.evaluate().
 * PRI-114: Added auto_correct handling with fail-closed validation.
 * No filesystem, no VM, no side effects.
 */
import type { RuleHostInput, RuleHostResult, LoadedImplementation } from './rule-host-contracts.js';
export interface DecisionMergeLogger {
    warn?: (_message: string) => void;
    onImplementationUnhealthy?: (_implementation: LoadedImplementation, _reason: string) => void;
}
/**
 * Alias for consumers that prefer the RuleHost naming convention.
 * @deprecated Use DecisionMergeLogger instead.
 */
export type RuleHostLogger = DecisionMergeLogger;
/**
 * Merge decisions from multiple loaded implementations.
 *
 * Rules:
 *   - If any implementation returns `block`, short-circuit and return block.
 *   - `auto_correct` proposals are collected and validated.
 *     First valid proposal wins. Invalid proposals are logged and skipped.
 *   - Collect all `requireApproval` results and merge their reasons/diagnostics.
 *   - `allow` results are ignored (no opinion).
 *   - Individual implementation errors are logged and skipped.
 *   - Outer errors return undefined (conservative degradation D-08).
 */
export declare function mergeDecisions(implementations: readonly LoadedImplementation[], input: RuleHostInput, logger?: DecisionMergeLogger): RuleHostResult | undefined;
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