export type SourceMigrationClassification = 'exact-duplicate' | 'legacy-only' | 'target-only' | 'divergent';
export interface SourceMigrationEntry {
    classification: SourceMigrationClassification;
    sourcePath: string | null;
    targetPath: string;
    sourceDigest: string | null;
    targetDigest: string | null;
    blockedReason?: string;
}
export interface SourceMigrationPlanV1 {
    schemaVersion: 'nexus-source-layout-migration-plan/v1';
    workspaceRoot: string;
    entries: SourceMigrationEntry[];
    summary: Record<SourceMigrationClassification, number>;
    applyAllowed: boolean;
    planDigest: string;
}
export declare function buildSourceLayoutMigrationPlan(startDir?: string): SourceMigrationPlanV1;
export declare function applySourceLayoutMigration(input: {
    workspaceDir?: string;
    expectedPlanDigest: string;
}): {
    planDigest: string;
    backupRoot: string;
    migratedFiles: number;
    deduplicatedFiles: number;
};