Unknown typescript

unknown is the type-safe counterpart of any. 
Anything is assignable to unknown, but unknown isn’t assignable 
to anything but itself and any without a type assertion or a
control flow based narrowing. 
Likewise, no operations are permitted on an unknown without 
first asserting or narrowing to a more specific type

Take a look here for some examples:
https://www.typescriptlang.org/docs/handbook/release-notes/typescript-3-0.html

Source: typescriptlang.org

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