import { Logger } from '../utils/logger';
export type PerProductConfig = {
    content: Array<Source>;
};
type Source = {
    source: string | null;
    weight: number;
};
export declare function isPerProductConfig(config: unknown, logger?: Logger, url?: string): config is PerProductConfig;
interface SelectSourceArgs {
    productId: string;
    content: Array<Source>;
    sessionId: string;
}
export declare function selectSource(args: SelectSourceArgs): Source;
export declare class PerProductConfigCache {
    #private;
    /** @internal */
    constructor(logger: Logger);
    getConfig(cdnPath: string): Promise<PerProductConfig | undefined>;
}
export {};