drf-spectacular generates NullEnum which throws an error

[wvffle]

Thanks for providing a fork that fixes some stuff and updates dependencies, great work!

In a project I'm currently working on, we're using drf-spectacular to generate schema.yml.

In the schema, there's a NullEnum generated:

NullEnum:
  enum:
    - null

And by default swagger-typescript-api-nextgen generates this as the NullEnum with the typescript error added:

export enum NullEnum {
  null = null, // Only numeric enums can have computed members, but this expression has type 'null'. If you do not need exhaustiveness checks, consider using an object literal instead. ts(18033)
}

But when used with --union-enums, it throws an exception:

☄️    start generating your typescript api
⚠️    wrong name of the model name null
SyntaxError: ';' expected. (1062:8)
  1060 | export type NullEnum = 
  1061 |
> 1062 | export interface PaginatedAPIMutationList {
       |        ^
  1063 |   
  1064 |   /** @example 123 */
  1065 |   count?: number;
    at Ve (/workspace/funkwhale/front/node_modules/prettier/parser-typescript.js:1:15607)
    at vz (/workspace/funkwhale/front/node_modules/prettier/parser-typescript.js:280:5919)
    at Object.yz [as parse] (/workspace/funkwhale/front/node_modules/prettier/parser-typescript.js:280:6242)
    at Object.parse (/workspace/funkwhale/front/node_modules/prettier/index.js:7334:23)
    at coreFormat (/workspace/funkwhale/front/node_modules/prettier/index.js:8645:18)
    at formatWithCursor2 (/workspace/funkwhale/front/node_modules/prettier/index.js:8837:18)
    at /workspace/funkwhale/front/node_modules/prettier/index.js:37229:12
    at Object.format (/workspace/funkwhale/front/node_modules/prettier/index.js:37243:12)
    at prettierFormat (/workspace/funkwhale/front/node_modules/swagger-typescript-api-nextgen/src/formatFileContent.js:68:19)
    at /workspace/funkwhale/front/node_modules/swagger-typescript-api-nextgen/src/formatFileContent.js:74:50 {
  loc: { start: { line: 1062, column: 8 } },
  codeFrame: '\x1B[0m \x1B[90m 1060 |\x1B[39m \x1B[36mexport\x1B[39m type \x1B[33mNullEnum\x1B[39m \x1B[33m=\x1B[39m \x1B[0m\n' +
    '\x1B[0m \x1B[90m 1061 |\x1B[39m\x1B[0m\n' +
    '\x1B[0m\x1B[31m\x1B[1m>\x1B[22m\x1B[39m\x1B[90m 1062 |\x1B[39m \x1B[36mexport\x1B[39m \x1B[36minterface\x1B[39m \x1B[33mPaginatedAPIMutationList\x1B[39m {\x1B[0m\n' +
    '\x1B[0m \x1B[90m      |\x1B[39m        \x1B[31m\x1B[1m^\x1B[22m\x1B[39m\x1B[0m\n' +
    '\x1B[0m \x1B[90m 1063 |\x1B[39m   \x1B[0m\n' +
    '\x1B[0m \x1B[90m 1064 |\x1B[39m   \x1B[90m/** @example 123 */\x1B[39m\x1B[0m\n' +
    '\x1B[0m \x1B[90m 1065 |\x1B[39m   count\x1B[33m?\x1B[39m\x1B[33m:\x1B[39m number\x1B[33m;\x1B[39m\x1B[0m'
}
error Command failed with exit code 1.

[wvffle]

Fixed in a personal fork: https://github.com/wvffle/swagger-typescript-api-nextgen/commit/3fd87ea2f848fb4b7ddb82ee2c6ba61b61ce33e1

Not the best solution as it generates

type NullEnum = null
interface SomeModel {
  field: NullEnum | null
}

in case of the schema that got generated by drf-spectacular, though that should work for now.