import type { ConfigV1, ConfigV2 } from "./types.js";
export { CURRENT_SCHEMA_VERSION } from "./schema.js";
export type MigrationValidator = (value: unknown) => unknown;
export interface MigrationStep {
    readonly fromVersion: number;
    readonly toVersion: number;
    readonly migrate: (input: unknown) => unknown;
}
export interface MigrationRegistryOptions {
    readonly currentVersion?: number;
    readonly steps?: readonly MigrationStep[];
    readonly validateFinal?: MigrationValidator;
}
/**
 * Pure, sequential migration registry.  It never writes files and clones the
 * input before invoking user-supplied migration code.
 */
export declare class MigrationRegistry {
    readonly currentVersion: number;
    readonly steps: readonly MigrationStep[];
    readonly validateFinal: MigrationValidator;
    constructor(options?: MigrationRegistryOptions);
    migrate(input: unknown): unknown;
}
export declare const defaultMigrationRegistry: MigrationRegistry;
export declare function createMigrationRegistry(options?: MigrationRegistryOptions): MigrationRegistry;
export declare function migrateConfig(value: unknown, registry?: MigrationRegistry): ConfigV1;
/** Deterministic V1 -> V2 migration.  No billing assumptions are introduced. */
export declare function migrateConfigV1ToV2(value: unknown): ConfigV2;
export declare const currentMigrationRegistry: MigrationRegistry;
export declare function migrateConfigToCurrent(value: unknown): ConfigV2;