Abstract functions to DRY the code

[esdmr]

Suggestion

Use functions to create the functions exposed as public API.

Benefit

This allows the code to be DRY. Currently there are a lot of function … { if (…) { throw new Error(…); } }.

This suggestion is unique

• I have searched the issue tracker and did not find an issue describing my suggestion, especially not one that has been rejected.

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Currently these functions are not properly documented by api-documenter. Therefore this issue is blocked by esdmr/template#52.