developer at @mayflowergmbh
Redux Toolkit co-maintainer
creator of RTK-Query
#TypeScript #React #Redux
Jan 28, 2020 • 7 tweets • 4 min read
This #TypeScriptTuesday, we're going to take a look at #TypeScript's interfaces.
Interfaces are different from types and both have their strengths in different situations.
Let's take a look.
This is just some interface definition - again an example from the #redux types:
An interface can also extend another interface.
Not only that, but also some (but not all) types.
Last #TypeScriptTuesday, we left off with a version of #redux-toolkit's `createAction` method that could be used with a mix of inferred and explicit #TypeScript Generic Arguments.
But that method would still take every `type` - including objects. Let's see how to restrict that.
This can be solved by using the `extends` keyword, which allows us to restrict a Type Argument. So here, we state that out `T` argument always has to be a valid `string`.
You could always override that restriction by using `any`.
But `extends` can do more than that...
Jan 14, 2020 • 6 tweets • 4 min read
While last #TypeScriptTuesday we looked at #TypeScript Generics Basics, today we continue where we left off, by taking a closer look at type argument inference, pitfalls and workarounds. We will take a look at a simplified version of #redux-toolkit's `createAction` function.
Here, we call this function three ways: