How can I generate schema from a TypeScript type?

[babakfp]

Hi

import type { RehypeShikiOptions } from "@shikijs/rehype"

I want to use the above type in below schema:

        builtInPlugins: v.optional(
            v.object({
                shiki: v.optional(
                    v.object({
                        enable: v.optional(v.boolean(), true),
                        options: // Here!
                    }),
                    {}
                ),
            }),
            {}
        ),

[fabian-hiller]

As far as I know, there is currently no way to generate it dynamically, but you could use the following site to translate your type automatically to a Valibot schema: https://sinclairzx81.github.io/typebox-workbench/

[babakfp]

That's an awesome tool, however, the types are coming from other libraries.

Is it possible to at least get type auto-completion? This is what I'm currently doing:

export const ConfigSchema = v.optional(
    v.object({
        builtInPlugins: v.optional(
            v.object({
                remarkParse: v.optional(v.object({}), {}),
            }),
            {}
        ),
    }),
    {}
)

// I would like to remove this
export type ConfigInput = v.Input<typeof ConfigSchema> & {
    builtInPlugins?: {
        remarkParse?: {
            options?: RemarkParseOptions
        }
    }
}

// I would like to remove this
export type ConfigOutput = v.Output<typeof ConfigSchema> & {
    builtInPlugins: {
        remarkParse: {
            options?: RemarkParseOptions
        }
    }
}

[fabian-hiller]

Why don't you write it that way?

const ConfigSchema = v.optional(
  v.object({
    builtInPlugins: v.optional(
      v.object({
        remarkParse: v.optional(v.object({}), {}),
      }),
      {}
    ),
  }),
  {}
);

type ConfigInput = v.Input<typeof ConfigSchema>;
type ConfigOutput = v.Output<typeof ConfigSchema>;

[babakfp]

Because I need the type completions for RemarkParseOptions. Without the modifications in ConfigInput and ConfigOutput I won't be getting the auto-coalitions, JSDoc comments, and more.
In Zod, you can do z.custom<MyType>(() => true, 'Error message') and it does what I'm looking for.

[fabian-hiller]

We have the same function, just called special. Take a look: https://valibot.dev/api/special/