Add option for failing on unknown JSON Schema type

[Winded]

Currently, the generator defaults to type { [k: string]: unknown; } if JSON Schema type is not a valid type. It would be helpful to have an option to make this fail the generation, i.e. throw an error instead of using this default value.

[cesarvspr]

@Winded would you please provide and example of schema that is translated to unknown typescript type?

[Winded]

I modified the example JSON to have invalid type for a field:

{
  "title": "Person",
  "type": "object",
  "properties": {
    "firstName": {
      "type": "string"
    },
    "lastName": {
      "type": "asd"
    },
    "age": {
      "description": "Age in years",
      "type": "integer",
      "minimum": 0
    },
    "hairColor": {
      "enum": ["black", "brown", "blue"],
      "type": "string"
    }
  },
  "required": ["firstName", "lastName"]
}

This results in generated code:

/* tslint:disable */
/**
 * This file was automatically generated by json-schema-to-typescript.
 * DO NOT MODIFY IT BY HAND. Instead, modify the source JSONSchema file,
 * and run json-schema-to-typescript to regenerate this file.
 */

export interface Person {
  firstName: string;
  lastName: {
    [k: string]: unknown;
  };
  /**
   * Age in years
   */
  age?: number;
  hairColor?: "black" | "brown" | "blue";
  [k: string]: unknown;
}

[tlahav]

Hi, looking a bit at this request. Does it make sense to add a 'strict' mode in the options and throw exception if we have a case of 'UNKNOWN'? or would that be too heavy handed?

I noticed there's also options.unknownAny. Should we still allow for those UNKNOWNs even in this new 'strict' mode?