let avalancheFuji: {
  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;
};