function getDefaultToken( chain: Readonly<ChainOptions & { rpc: string }>, symbol: | "WETH" | "USDT" | "USDC" | "WBTC" | "WMATIC" | "WBNB" | "BUSD" | "WFTM" | "WAVAX",): undefined | TokenInfo;
let chain: Readonly<ChainOptions & { rpc: string }>;
let symbol: | "WETH" | "USDT" | "USDC" | "WBTC" | "WMATIC" | "WBNB" | "BUSD" | "WFTM" | "WAVAX";
let returnType: undefined | TokenInfo;