import type * as CfTypes from './cf-types.ts';
export declare namespace HelperTypes {
    type AnyDON = CfTypes.DurableObjectNamespace<any>;
    type DOKeys<T> = {
        [K in keyof T]-?: T[K] extends AnyDON ? K : never;
    }[keyof T];
    /**
     * Helper type to extract DurableObject keys from Env to give consumer type safety.
     *
     * @example
     * ```ts
     *  type PlatformEnv = {
     *    DB: D1Database
     *    ADMIN_TOKEN: string
     *    SYNC_BACKEND_DO: DurableObjectNamespace<SyncBackendDO>
     * }
     *  export default makeWorker<PlatformEnv>({
     *    syncBackendBinding: 'SYNC_BACKEND_DO',
     *    // ^ (property) syncBackendBinding: "SYNC_BACKEND_DO"
     *  });
     */
    export type ExtractDurableObjectKeys<TEnv> = DOKeys<TEnv> extends never ? string : DOKeys<TEnv> & string;
    export {};
}
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