export declare function indexDesignResourceItems<T extends {
    key: string;
}>(items: T[]): Map<string, T>;
export declare function requireUniqueDesignResourceObjects(items: Array<{
    key: string;
}>, code: string): void;
export declare function requireUniqueDesignResourceValues<T>(values: T[], code: string): void;
export declare function requireNonemptyDesignResourceValues(values: readonly unknown[], code: string): void;
export declare function requireKnownDesignResourceRef(known: Map<string, unknown> | Set<string>, ref: string, kind: string): void;
export declare function requireDesignSourceItemKind(sourceItems: Map<string, string>, ref: string): void;
export declare function invalidDesignResourceHandoff(code: string, detail: string): never;