Generated typescript SDK throws "No supported protocol was found"

[mvhenten]

Hi,

I'm trying to build a TypeScript SDK using the CLI and the example "smithy-typescript-example-client" described in this readme. However, when trying to call any of the methods on my SDK the code throws a No supported protocol was found error.

Upon inspection I can see that the generated serialise/deserialise methods have this behaviour, looking this string in this repository I can see a protocol generator has to be implemented.

I haven't been able to find any working examples for a smithy_build.json that configure such a protocol generator. Am I missing something? Various blogs and examples mention working clients using the gradle build system, is it even possible to generate a working client using the CLI alone?

Any feedback appreciated! I would love to sell the folks at my company on Smithy but so far it's been tough going.

---

Using smithy cli version 1.42.0 using the generated sample:

smithy init -o smithy-typescript-example-client
cd smithy-typescript-example-client/

with the modifications as mentioned in the readme.

[mvhenten]

OK I found what I was missing. In the section https://github.com/smithy-lang/smithy-typescript/tree/7a8023b22bba45698793a665c02558f4e6ad3e51?tab=readme-ov-file#typescript-code-generation it is mentioned:

Note: AWS SDK for JavaScript v3, a customer of Smithy TypeScript, implements the AWS protocols and can be consumed by adding the software.amazon.smithy.typescript:smithy-aws-typescript-codegen package.

The gradle example also contains this code-gen, but the typescript-cli sample omits this. My full config had to contain these additional dependencies:

  "maven": {
    "dependencies": [
        "software.amazon.smithy:smithy-aws-traits:1.41.1",
        "software.amazon.smithy.typescript:smithy-aws-typescript-codegen:0.19.0",
        "software.amazon.smithy.typescript:smithy-typescript-codegen:0.19.0"
    ]
  },