The type 'GrpcObject' in TypeScript grpc does not contain any construct signatures

Just starting out in TypeScript and diving into Nest. I'm attempting to use my JS-written grpc-client, but running into an issue when exporting the grpc service object. Here's the code snippet:


        import {loadPackageDefinition, credentials} from '@grpc/grpc-js';
        import {loadSync} from '@grpc/proto-loader';

        const packageDefinition = loadSync(`${__dirname}/protos/main.proto`, {
            keepCase: true,
            longs: String,
            enums: String,
            defaults: true,
            oneofs: true,
            arrays: true
        });

        let { AuthService } = loadPackageDefinition(packageDefinition);

        export const auth_client = new AuthService(`localhost:${process.env.auth_grpc_port ? process.env.auth_grpc_port : 30030}`, credentials.createInsecure());

Error message received:

src/lib/grpc.client.ts:16:34 - error TS2351: This expression is not constructable. Not all constituents of type 'GrpcObject | ServiceClientConstructor | ProtobufTypeDefinition' are constructable. Type 'GrpcObject' has no construct signatures.

typescriptgrpc-js

Answer №1

It is regretful that the TypeScript types associated with the object produced by the loadPackageDefinition function are excessively broad to be effectively utilized in this manner. One potential resolution could involve employing the TypeScript generator that comes with version 0.6.x of @grpc/proto-loader to create specific TypeScript types for your proto files. Subsequently, you can implement a type assertion to structure the output of loadPackageDefinition in a way that accurately reflects the contents of your proto files.

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