function on(
  event: string,
  callback: (error: Error | null, payload: any | null) => void
): void;

async function createSession(): Promise<void>;

function approveSession({
  chainId: number, // Required
  accounts: string[] // Required
}): void;

function rejectSession({
  message: 'OPTIONAL_ERROR_MESSAGE'
}): void;

function updateSession({
  chainId: number, // Required
  accounts: string[] // Required
}): void;

function killSession(): void;

async function sendTransaction({
  from: string, // Required
  to: string, // Required
  gasLimit: string, // Required
  gasPrice: string, // Required
  value: string, // Required
  data: string, // Required
  nonce: string // Required
}): Promise<string>;

async function signTransaction({
  from: string, // Required
  to: string, // Required
  gasLimit: string, // Required
  gasPrice: string, // Required
  value: string, // Required
  data: string, // Required
  nonce: string // Required
}): Promise<string>;

async function signMessage(params: string[]): Promise<string>;

async function signPersonalMessage(params: string[]): Promise<string>;

async function signTypedData(params: any[]): Promise<string>;

async function sendCustomRequest(payload: IJsonRpcRequest): Promise<any>;

function approveRequest({
  id: number, // Required
  result: any // Required
}): void;

function rejectRequest({
  id: 1,
  error: {
    message: "OPTIONAL_ERROR_MESSAGE"
  }
}): void;