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I am using grpc-web to communicate with a java backend over gRPC. I am using ReactJS on the frontend which uses grpc-web to interpret the protobuffers.

I am getting this strange error. My protos are correct ( I checked using a reflection tool called "bloom" so the backend is just fine) This somehow seems like an error internal to the grpc libraries I am using in ReactJS.

I get the following error:

TypeError: Cannot read properties of undefined (reading 'MethodInfo')

The above error points to my proto file: dashboard_services_grpc_web_pb.js

In this file, it point to this line

const methodInfo_DashboardService_userLogin = new grpc.web.AbstractClientBase.MethodInfo( ...... );

I have a hard time solving this because according to my understanding, grpc.web.AbstractClientBase is something native to grpc-web.

I have also reinstalled my node_modules in hopes that this is a version issue but no avail.

Asma Rahim Ali Jafri
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2 Answers2

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I had the same issue because I was using an old release of the executable protoc-gen-grpc-web with respect to the current version of grpc-web. Using version 1.3.0 for both solved the issue for me. You can download the latest release of protoc-gen-grpc-web here.

Daniele Tavernelli
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  • Thank you ... but somehow I could not install `proto-gen-grpc-web` for version 1.3.0. I used the command `npm i proto-gen-grpc-web@1.3.0` but all I got was `No matching version found for protoc-gen-grpc-web@1.3.0.` – Asma Rahim Ali Jafri Oct 15 '21 at 09:59
  • I just checked npm's website, they haven't released version 1.3.0 yet. Do you know how I can add an exe file to my package.json? – Asma Rahim Ali Jafri Oct 15 '21 at 10:20
  • you need to download the executable for your platform and add it to your PATH variable, then $ protoc -I=$DIR echo.proto \ --js_out=import_style=commonjs:$OUT_DIR \ --grpc-web_out=import_style=commonjs,mode=grpcwebtext:$OUT_DIR will generate the right code. – Daniele Tavernelli Oct 15 '21 at 10:42
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In my case it was happening after cache clear, because we had:

"grpc-web": "^1.2.1",

and it was installed version 1.3.0 I changed it to:

"grpc-web": "1.2.1",

and yarn again to fix this issue!

SayJeyHi
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