/**
 * Schema Snapshot Manager
 *
 * Manages the schema snapshot at .apso/sandbox/schema-snapshot.json.
 * The snapshot stores the .apsorc content at the time of last successful migration.
 * Comparing current .apsorc against the snapshot detects whether a migration is needed.
 */
/**
 * Shape of the stored snapshot (mirrors the parsed .apsorc structure)
 */
export interface ApsorcSnapshot {
    entities: Array<{
        name: string;
        fields?: Array<{
            name: string;
            type: string;
            nullable?: boolean;
            unique?: boolean;
            default?: unknown;
            index?: boolean;
        }>;
        primaryKeyType?: string;
        created_at?: boolean;
        updated_at?: boolean;
        scopeBy?: string | string[];
    }>;
    relationships?: Array<{
        from: string;
        to: string;
        type: string;
        to_name?: string;
        nullable?: boolean;
        bi_directional?: boolean;
        cascadeDelete?: boolean;
    }>;
    version?: number;
    rootFolder?: string;
    apiType?: string;
}
/**
 * Subset of ParsedApsorc we use for comparison.
 * Avoids importing the full ParsedApsorc type which carries runtime-only data (relationshipMap).
 */
export interface ComparableSchema {
    entities: Array<{
        name: string;
        fields?: Array<{
            name: string;
            type: string;
            nullable?: boolean;
            unique?: boolean;
            default?: unknown;
            index?: boolean;
        }>;
        primaryKeyType?: string;
        created_at?: boolean;
        updated_at?: boolean;
        scopeBy?: string | string[];
    }>;
    relationships?: ApsorcSnapshot["relationships"];
}
/**
 * Read the saved schema snapshot, or null if none exists.
 */
export declare function readSnapshot(projectDir?: string): ApsorcSnapshot | null;
/**
 * Write a schema snapshot to disk.
 */
export declare function writeSnapshot(schema: ApsorcSnapshot, projectDir?: string): void;
/**
 * Delete the snapshot and sandbox directory contents (for --reset).
 */
export declare function resetSnapshot(projectDir?: string): void;
export declare function hasChanges(current: ComparableSchema, snapshot: ApsorcSnapshot | null): boolean;