typelevel-ts | Type level programming in TypeScript | Functional Programming library
kandi X-RAY | typelevel-ts Summary
kandi X-RAY | typelevel-ts Summary
Type level programming in TypeScript
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QUESTION
I am building a type definition set that operates on a user provided type which represents the model of their "state".
One of the things I need to be able to do is to narrow the types of their model as I produce new types that are used and exposed to them.
I am having problems narrowing properties on an object that are index signatures.
For example:
...ANSWER
Answered 2019-Jun-03 at 08:52Here's one way to do it:
First, how do we tell the difference between Person["favouriteNumbers"]
and Person["address"]
?
This looks promising:
QUESTION
Here is my first attempt: (playground link)
...ANSWER
Answered 2019-Mar-31 at 20:23We should take different approaches depending on the problem. For example, if we know that we're comparing numbers with any, we can use typeof()
.
If we're comparing interfaces, for example, we can use this approach:
QUESTION
I have a utility function which helps to type check injected stores in react component
...ANSWER
Answered 2018-Jul-09 at 16:01While you don't provide a usage example, from what I understand of your code, you want to return a new component, that will not have the stores that are passed in storeKeysToInject
.
Pick
picks properties from a type so Pick
is an object containing only the stores passed in to storeKeysToInject
.
Diff
removes keys from a type, so the second parameter must be the keys to be removed. So the conclusion is you don't really need the Pick
you just need to remove StoreKeyToInject
from ExpectedProps
(StoreKeyToInject
will already be a key of Stores
so there is no need to bring Stores
into the discussion again)
QUESTION
I have a utility function which does the type level check on injecting store to react component.
...ANSWER
Answered 2018-Jul-09 at 02:44It looks like Omit
requires the first generic to be an object, so it should work if you add that constraint for D:
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