`$def`s from `$ref`ed schema do not get propagated

[DiamondJoseph]

I have a key in my values that is used to construct a Pydantic BaseModel for the python service that my Helm chart deploys. Due to some easy to miss mistakes in whitespace, I wanted helm template to be able to catch these.

My values.yaml has this key

# @schema
# $ref: config_schema.json
# @schema
# -- Config for the worker goes here, will be mounted into a config file
worker:
  api:
    # -- 0.0.0.0 required to allow non-loopback traffic
    # If using hostNetwork, the port must be free on the host
    url: http://0.0.0.0:8000/

And config_schema.json has the following:

{
  "$defs": {
    "RestConfig": {
      "additionalProperties": false,
      "properties": {
        "url": {
          "default": "http://localhost:8000/",
          "format": "uri",
          "maxLength": 2083,
          "minLength": 1,
          "title": "Url",
          "type": "string"
        }
      },
      "title": "RestConfig",
      "type": "object"
    },
  },
  "additionalProperties": false,
  "description": "Config for the worker application as a whole. Root of\nconfig tree.",
  "properties": {
    "api": {
      "$ref": "#/$defs/RestConfig"
    }
  },
  "title": "ApplicationConfig",
  "type": "object"
}

But when my values.schema.json is generated:

{
  "$schema": "http://json-schema.org/draft-07/schema#",
  "additionalProperties": false,
  "properties": {
    "worker": {
      "additionalProperties": false,
      "description": "Config for the worker application as a whole. Root of\nconfig tree.",
      "properties": {
        "api": {
          "$ref": "#/$defs/RestConfig",
          "required": []
        }
      },
      "required": [],
      "title": "ApplicationConfig",
      "type": "object"
    }
  },
  "required": [],
  "type": "object"
}

$ helm template chart/
Error: values don't meet the specifications of the schema(s) in the following chart(s):
chart:
Object has no key '$defs'

[DiamondJoseph]

I believe the fix may be adding $def as a field to the Schema struct?

helm-schema/pkg/schema/schema.go

Line 221 in eb9f801

type Schema struct {

	Defs           map[string]*Schema     `yaml:"$defs,omitempty"           json:"$defs,omitempty"`

?

[dat-intellis]

i do believe nested "$ref" statements are suffering from the same issue.

(referencing a schema definition, which references another in the same schema)