Support standaloneCode with JTD parsers/serializers

[ASDFGerte]

Is standalone code generation for JTD parsers/serializers supported, and if yes, how?

What version of Ajv are you using? Does the issue happen if you use the latest version? 8.0.1 Didn't try, as it is reasonably close, and changelogs do not indicate any related changes.

JTD

Example JTD, doesn't really matter.

{
  "ref": "tree",
  "definitions": {
    "tree": {
      "properties": {
        "value": { "type": "int32" }
      },
      "optionalProperties": {
        "left": { "ref": "tree" },
        "right": { "ref": "tree" }
      }
    }
  }
}

Your code

const Ajv = require('ajv/dist/jtd');
const standaloneCode = require('ajv/dist/standalone').default;
const ajv = new Ajv({ code: { source: true } });

const validator =  ajv.compile(schema);
const parser =     ajv.compileParser(schema);
const serializer = ajv.compileSerializer(schema);

standaloneCode(ajv, validator);  // works
standaloneCode(ajv, parser);     // error
standaloneCode(ajv, serializer); // error

Uncaught Error: moduleCode: function does not have "source" property

What results did you expect? Standalone code being emitted, similar to the validator.

Are you going to resolve the issue? I don't think you want someone, who has only looked at the source code of this project for at most half an hour, to mess with code generation. Additionally, it would likely take me days, to catch up on the internals of ajv. It looked like most of the foundation was already there (when generating the functions in the first place), and only some code generation meta-data (scope, ...) wasn't added to a source-property. If it doesn't already work (maybe i just made a simple mistake), i have hope, that it's not a hard fix, for someone who knows the project.

Thanks in advance :)

[epoberezkin]

It is not yet supported indeed. Parsers/serializers are still super new - support for standalone needs to be added. It shouldn't be too difficult, as code generation machinery is the same.

[bestickley]

+1 on this feature! JTD producing TS types with JTDDataType is really nice. Have to use JSON Schema for standalone feature (need it to minimize cold starts in AWS Lambda) but this would be great.

[Tarrowren]

I modified the code a little bit and was able to generate es5 successfully.

But some of the code is hardcoded, so the esm option is not supported for the time being.