/**
 * The structural part of a Cloudflare Workflow instance used to prove that a
 * failed create call actually left an addressable durable instance behind.
 */
export interface CloudflareWorkflowInstanceLike<TStatus = unknown> {
    status(): Promise<TStatus>;
}
/** The structural binding implemented by Cloudflare's `Workflow<TParams>`. */
export interface CloudflareWorkflowBindingLike<TParams, TStatus = unknown, TInstance extends CloudflareWorkflowInstanceLike<TStatus> = CloudflareWorkflowInstanceLike<TStatus>> {
    create(input: {
        id: string;
        params: TParams;
    }): Promise<TInstance>;
    get(id: string): Promise<TInstance>;
}
export interface EnsureCloudflareWorkflowInstanceResult<TStatus, TInstance extends CloudflareWorkflowInstanceLike<TStatus>> {
    instance: TInstance;
    /** False only when create failed but the same id was proven readable. */
    created: boolean;
    /** Present on reuse because reading status is the proof the instance exists. */
    status?: TStatus;
}
/**
 * Create one durable Workflow instance, or prove an instance with the same id
 * already exists before accepting a create error as an idempotent retry.
 *
 * Cloudflare does not expose a stable duplicate-error class. Matching error
 * text can therefore swallow unrelated failures. This helper uses the durable
 * resource itself as proof: `get(id).status()` must succeed, otherwise the
 * original create error is rethrown.
 */
export declare function ensureCloudflareWorkflowInstance<TParams, TStatus, TInstance extends CloudflareWorkflowInstanceLike<TStatus>>(binding: CloudflareWorkflowBindingLike<TParams, TStatus, TInstance>, input: {
    id: string;
    params: TParams;
}): Promise<EnsureCloudflareWorkflowInstanceResult<TStatus, TInstance>>;