How to add import using custom type in primitiveTypeConstructs override

Hello there! I would love to know how I can add import to some custom type to the interfaces generating by Swagger-typescript-api.

I added such option
```js
output: path.resolve(__dirname, './generatedApi/'),
primitiveTypeConstructs: (constructs) => ({
...constructs,
string: {
uuid: 'Guid',
},
}),
```

And in `src/types/Guid.ts` i have this
```js
export type Guid = Opaque<'Guid', string>;
```

I tried many thing but didn't made it work anyhow. I want Swagger-typescript-api to add import on this exact type, so i won't have typescript errors.