bsc
let bsc: {  readonly blockExplorers?: Array<{    apiUrl?: string;    name: string;    url: string;  }>;  readonly experimental?: { increaseZeroByteCount?: boolean };  readonly icon?: Icon;  readonly id: number;  readonly name?: string;  readonly nativeCurrency?: {    decimals?: number;    name?: string;    symbol?: string;  };  readonly rpc: string;  readonly testnet?: true;};