type toJsonSchema() does not include information about value defaults

[fnimick]

Report a bug

🔎 Search Terms

jsonschema, json schema, default

🧩 Context

  System:
    OS: macOS 15.3
    CPU: (10) arm64 Apple M1 Pro
    Memory: 134.95 MB / 16.00 GB
    Shell: 5.9 - /bin/zsh
  Binaries:
    Node: 20.13.1 - ~/.asdf/installs/nodejs/20.13.1/bin/node
    Yarn: 1.22.19 - ~/.yarn/bin/yarn
    npm: 10.5.2 - ~/.asdf/plugins/nodejs/shims/npm
    pnpm: 9.7.0 - ~/.asdf/shims/pnpm
  npmPackages:
    arktype:  2.0.0 
    typescript: ^5.7.3 => 5.7.3 

🧑‍💻 Repro

let objWithDefault = type({nameWithDefault: 'string = "foo"'});
objWithDefault.toJsonSchema();
// { type: 'object', properties: { nameWithDefault: { type: 'string' } } }
// should resolve to:
// { type: 'object', properties: { nameWithDefault: { type: 'string', default: 'foo' } } }

This issue prevents Arktype defaults from working with sveltekit-superforms with the generated json schema, since superforms fills defaults based on the json schema provided by the validation adapter.

[ssalbdivad]

Yeah, currently only the concrete input type is included without metadata or format.

I will address this alongside some other upcoming changes to the API to make it more powerful and flexible (#1110, #1227)