export type RuntimeWriterVersion = 1 | 2;
export interface ActiveRuntimePointerView {
    readonly schema_version: 2;
    readonly active_version: RuntimeWriterVersion;
    readonly updated_at: string;
    readonly reason: string;
}
/**
 * Shared dual-writer guard. Every durable mutator (v1 and v2) must call this
 * before writing. Absent pointer allows only v1 (legacy default).
 */
export declare function assertMutationAllowed(writerVersion: RuntimeWriterVersion, activeRuntimePath: string): void;
/**
 * Workspace-level fence: always consult `<workspace>/.oms/active-runtime.json`,
 * even when v1 state is rooted elsewhere via override.
 */
export declare function workspaceActiveRuntimePath(workspaceRoot: string, cwd?: string): string;
export declare function assertWorkspaceWriterAllowed(writerVersion: RuntimeWriterVersion, workspaceRoot: string, cwd?: string): void;
export declare function readActiveRuntimePointer(activeRuntimePath: string): ActiveRuntimePointerView | null;
/** @deprecated Prefer workspaceActiveRuntimePath — co-located pointer for default state roots. */
export declare function activeRuntimePathForStateRoot(stateRoot: string): string;
export declare function activeRuntimePathForOmsRoot(omsRoot: string): string;
/** Infer state root from a record-store locks directory (`…/locks`). */
export declare function stateRootFromLocksRoot(locksRoot: string): string;
/**
 * Infer workspace from locks root when state lives at `<workspace>/.oms/locks`.
 * Returns undefined for non-default layouts (caller must pass workspaceRoot).
 */
export declare function inferWorkspaceRootFromLocksRoot(locksRoot: string): string | undefined;
export declare function assertV1MutationAllowedFromLocksRoot(locksRoot: string, workspaceRoot?: string): void;