Invalid TS models when properties are nullable

Hi! It seems the openapi connector is not setting the correct TS type when setting true the nullable flag

For example, with the following JSON OpenAPI definition model:

      "TestObject": {
        "type": "object",
        "properties": {
          "name": {
            "type": "string",
            "nullable": true,
             "default": null,
            "description": "Test property",
            "example": null
          },

It creates a model with the following property:

  @property({jsonSchema: {
  type: [
    'string',
    'null',
  ],
  default: null,
  description: 'Specific endpoint for this queue, if not specified, the generic endpoint for this service will be used',
}})
  endpoint?: string = null;

Obviously, as endpoint is set as string, it throws a TS Check error in build time:
error TS2322: Type 'null' is not assignable to type 'string | undefined'.

Why isn't setting the property type correctly, whereas in the type annotation seems to be aware of it?

Thanks!

Start by tracing the OpenAPI connector's TypeScript model generation for a property with nullable: true and default: null. Compare the generated property annotation with its declared type, then run the relevant model-generation checks or TypeScript build; done means nullable properties accept null without TS2322.