Support for constant values

[nicojs]

Support const values (new in v6). https://json-schema.org/understanding-json-schema/reference/generic.html#constant-values

Input

{
  "$id": "https://api.nn-group.com/t/nn-nl/2/json_schemas/forwardcache_notify_participation",
  "$schema": "http://json-schema.org/draft-07/schema#",
  "title": "Foo",
  "required": ["bar"],
  "additionalProperties": false,
  "properties": {
    "bar": {
      "const": true
    }
  }
}

Expected output:

export interface Foo {
  bar: true;
}

Current output:

export interface Foo {
  bar: {
    [k: string]: any;
  };
}

This feature was mentioned in #120 but as the scope of that is a bit too big for beginning contributors I thought I would split this feature out.

Any hints for json-schema-to-typescript newbies would be much appreciated.

[djbeaumont]

I've been hoping someone would give this a try for about a year now and I've finally had a chance to give this a go in the PR above #264

[bcherny]

Fixed in #290, published in v10.1.0.