/**
 * Chain & platform helpers.
 * Maps API chain values (bsc/base/solana) to user-facing display names.
 * Accepts 'bnb' as alias for 'bsc' where applicable.
 */
/** Valid API chain values. */
export declare const VALID_CHAINS: readonly ["base", "bsc", "solana"];
/** Platform → supported chains. Mirrors backend conf/platform.py PLATFORM_CHAINS. */
export declare const PLATFORM_CHAINS: Record<string, readonly string[]>;
/** Default platform per chain. Mirrors backend DEFAULT_PLATFORM_BY_CHAIN. */
export declare const DEFAULT_PLATFORM: Record<string, string>;
/** Get platforms available for a chain, default first. */
export declare function platformsForChain(chain: string): string[];
/** Check if a platform is valid for a given chain. */
export declare function isValidPlatform(platform: string, chain: string): boolean;
/** Map API chain name to display name */
export declare function chainDisplay(chain: string | undefined | null): string;
/** Normalise user-input chain to API chain name. Accepts 'bnb' → 'bsc'. */
export declare function normaliseChain(chain: string): string;