[BUG] TypeScript enums are handled incorrectly

[jabuj-amalytix]

Environment
JavaScript 1.7.0

Describe the bug
Whenever a enum is used in the type declarations, it refers to an instance of a class, not to a constant

To Reproduce

new PricingSpAoi(...).getCompetitiveSummary({
  requests: [
    {
      method: 'GET',
      // -> The type "string" cannot be assigned to the type "HttpMethod"
      asin: '...',
      marketplaceId: '...',
      includedData: ['featuredBuyingOptions'],
      // -> The type "string" cannot be assigned to the type "CompetitiveSummaryIncludedData"
    }
  ]
})

Expected behavior
No error

Additional context
Note, that HttpMethod and CompetitiveSummaryIncludedData are classes and not enums, so typescript expects an instance of a class here which is weird