Change interface to class in exported types

[flappyBug]

Class constructor should be exported as class instead of interface.

Why does this matter? Interface is removed in runtime after compilation. But actually, types like Logger is accessible in pure js. For my use case, I'll need a runtime type as a dependency injection token, as well as a well-typed interface.

Another reason is class is inheritable, but if one wants to make a class extending interface, he/she should implement all the methods declared in interface.

Ref: https://stackoverflow.com/questions/14345485/whats-the-difference-between-declare-class-and-interface-in-typescript

[flappyBug]

Can someone help to review this?

[wbt]

It seems OK to me, as those types are classes.
Note that at least from me and likely more generally you'll get faster, simpler reviews if you separate functional changes from formatting changes (e.g. removing spaces, adding line breaks, double to single quotes, etc.).

[flappyBug]

Ah, you're right. For the style change, it's auto formatted by my IDE. I noticed that and didn't revert that because I saw editorconfig and prettier configured in the project. The formatting just follows those configs.

[flappyBug]

And I think we'd better have style check in CI for better collaboration. But that's out of scope for this PR.

[wbt]

Out in 3.8.1.