/**
 * Config G3 — multi-module merge collision policy.
 *
 * Defaults match today's strict behavior (`error` on duplicate names).
 * `lastWins` keeps the declaration from the last file in topological order.
 */
export declare const MERGE_DUPLICATE_POLICIES: readonly ["error", "lastWins"];
export type MergeDuplicatePolicy = (typeof MERGE_DUPLICATE_POLICIES)[number];
export interface ManifestMergeIntegrityConfig {
    /** Duplicate entity names across files. Default: `error`. */
    onDuplicateEntity?: MergeDuplicatePolicy;
    /** Duplicate command names (entity-qualified) across files. Default: `error`. */
    onDuplicateCommand?: MergeDuplicatePolicy;
    /**
     * Module compile order. Only `lexicographic` topo order is supported
     * (already how `resolveModuleGraph` orders files).
     */
    moduleOrder?: 'lexicographic';
    /** Cross-file relationship / store targets. Default: true. */
    allowCrossModuleRefs?: boolean;
    /**
     * Cycle detection in `use` graphs. Must be true (default); `false` is rejected.
     */
    forbidCycles?: boolean;
}
export interface ResolvedMergeIntegrity {
    onDuplicateEntity: MergeDuplicatePolicy;
    onDuplicateCommand: MergeDuplicatePolicy;
    moduleOrder: 'lexicographic';
    allowCrossModuleRefs: boolean;
    forbidCycles: true;
}
export declare function isMergeDuplicatePolicy(value: unknown): value is MergeDuplicatePolicy;
/**
 * Resolve config to a concrete policy. Invalid `forbidCycles: false` throws —
 * cycles are a language invariant, not a CI knob.
 */
export declare function resolveMergeIntegrity(raw: ManifestMergeIntegrityConfig | undefined): ResolvedMergeIntegrity;
/** Keep the last item per key (topo order / concatenation order). */
export declare function dedupeLastByKey<T>(items: readonly T[], keyOf: (item: T) => string): T[];
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