import { type Context } from 'koa';
import { AppsembleError } from './AppsembleError.js';
export declare function createResourceEtag(resource: Record<string, unknown>): string;
export declare function addResourceEtag<T extends Record<string, unknown>>(resource: T): T & {
    $etag: string;
};
export declare function matchesResourceIfMatch(ifMatch: string | string[] | undefined, currentEtag: string): boolean;
export declare function setResourceEtagHeader(ctx: Context, resource: Record<string, unknown> | null | undefined): void;
export declare class ResourcePreconditionFailedError extends AppsembleError {
    readonly data: {
        code: 'RESOURCE_PRECONDITION_FAILED';
        resourceId: number | string;
        resourceType: string;
    };
    readonly error = "Precondition Failed";
    readonly statusCode = 412;
    constructor(resourceType: string, resourceId: number | string);
}
export declare function throwResourcePreconditionFailedKoaError(ctx: Context, resourceType: string, resourceId: number | string): never;