fix: raw key Typescript return type

[joaopedrocampos]

Fixes the raw return on Typescript types

Checklist

• run npm run test and npm run benchmark
• tests and/or benchmarks are included (not sure if the index.ts is considered a benchmark)
• documentation is changed or added
• commit message and code follows the Developer's Certification of Origin
  and the Code of conduct

Related issue: #129

[joaopedrocampos]

@aboutlo I added a new schema on the type's index.ts, but not sure if it's needed and if I used it correctly, what I tried to do was basically add a new "test" to show that the required key is valid independent of it's position

[mcollina]

lgtm

[coveralls]

Pull Request Test Coverage Report for Build 1001180339

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 99.559%

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Totals
Change from base Build 994617246:	0%
Covered Lines:	410
Relevant Lines:	410

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💛 - Coveralls