TypeError: b is not a function. (In 'b(null, d)', 'b' is undefined)

Hi there,

I’m having some issues invoking gRPC-web calls from my React application. Invoking my RPC works correctly and the server receives the request without issue, however an error appears in my console on every request.

index.js:60 Uncaught TypeError: b is not a function
    at Array.<anonymous> (index.js:60)
    at yc (index.js:53)
    at S.<anonymous> (index.js:51)
    at Ib (index.js:34)
    at O (index.js:33)
    at oc (index.js:42)
    at S.push../node_modules/grpc-web/index.js.S.O (index.js:40)
    at S.push../node_modules/grpc-web/index.js.S.K (index.js:40)

I’m running a gRPC server in Go with a React application communicating with the Go server via the Envoy proxy.

I compile my Proto using the following command:

protoc \
		--js_out=import_style=commonjs,binary:web-client/src/ \
		--grpc-web_out=import_style=commonjs,mode=grpcwebtext:web-client/src/ \
		proto/myapp.proto

$ protoc --version
libprotoc 3.14.0

and I build my request from React like so:

const { GetMessagesRequest, Message } = require('../../proto/myapp_pb.js');
const { MyappClient } = require('../../proto/myapp_grpc_web_pb');

const myappService = new MyappClient('http://localhost:8080');
const msg = new Message()

const meta = {
    "authorization": "fake_123456",
  }

await myappService.broadcast(msg, meta)

[alertedsnake]

My coworker found the issue here - before, my call looked like this:

function doCall() {
  return new Promise((resolve, reject) => {
        client.rpcCall(request)
            .on("data", () => resolve())
            .on("status", () => {})
            .on("error", response => reject(response.message));
   });
}

But now it needs to look like:

function doCall() {
  return new Promise((resolve, reject) => {
        client.rpcCall(request, null, (err, response) => {
            if (err) {
                reject(err.message);
            }
            else {
                resolve();
            }
        });
   });
}

Hopefully this may help you as well.

[alertedsnake]

@Enrikerf oh - I’m FAR from the right person to be asking, I do very little Javascript, not sure I can really help much 😃