Function onRpcError

Middleware that will call handler whenever an RPC error happens, with the error object itself.

The handler can either return nothing (in which case the original error will be thrown), a new error (via the _: 'mt_rpc_error' object), or any other value, which will be returned as the result of the RPC call.

Note that the return value is not type-checked due to limitations of TypeScript. You'll probably want to use satisfies keyword to ensure the return value is correct, for example:

networkMiddlewares.onRpcError(async (ctx, error) => {
  if (rpc.request._ === 'help.getNearestDc') {
    return {
      _: 'nearestDc',
      country: 'RU',
      thisDc: 2,
      nearestDc: 2,
    } satisfies tl.RpcCallReturn['help.getNearestDc']
  }
})
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