Parametrized Type

[JoanPuig]

Hi, I was trying to emmit Json Schema for a parametrized type as follows:

import "@typespec/json-schema";

using JsonSchema;

@jsonSchema
namespace Schemas;

model MyType<T> {
  value: T;
}

alias MyBooleanType = MyType<boolean>;

and I got:

ExternalError: Emitter "@typespec/json-schema" crashed! This is a bug.
Please file an issue at https://github.com/microsoft/typespec/issues

Error: Encountered type TemplateParameter which we don't know how to emit.
    at compilerAssert (https://typespec.blob.core.windows.net/pkgs/@typespec/compiler/1.1.0/chunk-C5OIDG33.js:306:9)
    at typeEmitterKey (https://typespec.blob.core.windows.net/pkgs/@typespec/json-schema/1.1.0/index.js:1257:9)
    at Object.emitType (https://typespec.blob.core.windows.net/pkgs/@typespec/json-schema/1.1.0/index.js:922:19)
    at https://typespec.blob.core.windows.net/pkgs/@typespec/json-schema/1.1.0/index.js:851:29
    at withPatchedReferenceContext (https://typespec.blob.core.windows.net/pkgs/@typespec/json-schema/1.1.0/index.js:1184:14)
    at Object.emitTypeReference (https://typespec.blob.core.windows.net/pkgs/@typespec/json-schema/1.1.0/index.js:835:14)
    at JsonSchemaEmitter.modelPropertyLiteral (https://typespec.blob.core.windows.net/pkgs/@typespec/json-schema/1.1.0/index.js:4910:39)
    at https://typespec.blob.core.windows.net/pkgs/@typespec/json-schema/1.1.0/index.js:1049:49
    at withTypeContext (https://typespec.blob.core.windows.net/pkgs/@typespec/json-schema/1.1.0/index.js:1165:5)
    at invokeTypeEmitter (https://typespec.blob.core.windows.net/pkgs/@typespec/json-schema/1.1.0/index.js:1039:5)

--------------------------------------------------
Library Version                1.1.0
TypeSpec Compiler Version      1.1.0
--------------------------------------------------

I was hoping that the alias MyBooleanType would be generated correctly.

Any ideas?

Thanks

[timotheeguerin]

Is that the same issue as #7828, emitAllModels: true seems to be workaround for it for now

[JoanPuig]

@timotheeguerin thanks for the quick answer. I tried emitAllModels, which now is not giving the error, but it generates no files either. I am using the frontend web (https://typespec.io/playground/)

[timotheeguerin]

I think this is because the template instances are not actually referenced anywhere(alias just doesn't make a declaration) if you add a reference then they are example

[JoanPuig]

Thanks a lot @timotheeguerin