Can assign incompatible measures if they have some dimensions in common,

[niklashallenfur]

The following, taken from the documentation

const error: Velocity = length.times(time);
// ERROR: A measure of m*s isn't assignable to a measure of m/s.

Gives a compile-time error.

But removing the times operation, making it just

const error: Velocity = length

Does not give a compile-time error, although the measures are clearly incompatible Am I missing something? I have strict turned on in my tsconfig file.

Thanks otherwise for a fantastic library

[jscheiny]

Hey, thanks for bringing this to my attention! This actually exposes a pretty fundamental issue with the library that's gonna be pretty difficult to fix since typescript is structurally typed. I definitely should've thought of this sooner. This is going to take a while to resolve but my intuition right now is that we will need to make more stringent restrictions on custom dimensions that users can create in the library.

[jscheiny]

Actually this might be doable now. I had assumed that exact types would require a language update but it seems they are possible now! Will work on integrating this clever bit of type hackery into the code soon:

https://github.com/microsoft/TypeScript/issues/12936#issuecomment-524631270

[cloudify]

hello @jscheiny , thanks for this wonderful library - I think I just found another case where the library allows mixing units:

const a = length.times(time);
const b = length.plus(a); // <- this should not be allowed

I'm happy to help.

[phpcoder2022]

Hello. I joyed that you created so library and want help solve the problem. May be this trick help you.

[phpcoder2022]

I deleted odd hack from my solution.