export type DoorRequest = {
    method: string;
    path: string;
    body: Record<string, unknown>;
};
export type Refusal = {
    status: number;
    message: string;
};
export type Prepared = {
    body: Record<string, unknown>;
} | {
    refusal: Refusal;
};
export type AllowedRoute = {
    method: string;
    path: string;
};
export type PartCheck = (part: Record<string, unknown>) => string | null;
export type FieldMove = {
    from: string;
    to: string;
};
export type RequestRules = {
    routes: AllowedRoute[];
    parts: Record<string, PartCheck>;
    moved: FieldMove[];
    refused: string[];
};
export declare function anyPart(): null;
export declare function dataImagePart(part: Record<string, unknown>): string | null;
/** Validate the route and message parts, move fields, then reject unsupported fields. */
export declare function applyRequestRules(rules: RequestRules, request: DoorRequest): Prepared;