Enum const from TypeSpec?

[rhodee]

I would like to generate a const enum of the JSON schema from the json schema emitter. What options do we currently have to do this within Typespec?

[timotheeguerin]

Do you want to do that Playground

import "@typespec/json-schema";

using TypeSpec.JsonSchema;

@jsonSchema
namespace Schemas;

model Person {
  thisIsAConst: "abc";
}

[rhodee]

Thank you for the reply @timotheeguerin. I realize the question was ambiguous. What I meant is generating an enum const from the output of the json schema emitter.

[timotheeguerin]

Not sure I fully get what you are saying, do you have an example?

[rhodee]

I've provided an example here:

The gist of what I want to do is:

1. Emit JSON Schema (as done in the link)
2. Generate an equivalent TS file with a const enum of the JSON schema (e.g. Cars.ts)

Is this clearer? Apologies for the back and forth.

[timotheeguerin]

I see, so mean you would have this sort of output in a TypeScript file?

const Person = {
    "$schema": "https://json-schema.org/draft/2020-12/schema",
    "$id": "Person.json",
    "type": "object",
    "properties": {
        "displayName": {
            "type": "string",
            "minLength": 5,
            "description": "The person's first name."
        },
        "address": {
            "$ref": "Address.json",
            "description": "Person address"
        },
        "nickNames": {
            "type": "array",
            "items": {
                "type": "string"
            },
            "uniqueItems": true,
            "description": "List of nick names"
        },
        "cars": {
            "type": "array",
            "items": {
                "$ref": "Car.json"
            },
            "description": "List of cars person owns"
        }
    },
    "required": [
        "displayName",
        "address"
    ]
} as const;

if so we don't have this functionality right now but this is something you could make a custom emitter for and use the json schema emitter to get the json schema.

[rhodee]

That output is exactly what I was seeking. What code exists that I can review that leverages an existing emitter's output to emit something else?