HNAPI | Swift HackerNews interaction package | REST library
kandi X-RAY | HNAPI Summary
kandi X-RAY | HNAPI Summary
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Currently covering the most popular Java, JavaScript and Python libraries. See a Sample of HNAPI
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QUESTION
In the code below (it compiles just fine), it was my expectation that any response data that did not conform to the interface IStory, would throw an error. However, this is not the case, and all the data is put in state normally. But there is certainly no thisPropertyDoesNotExist
property on any of the response objects. Why isn't the interface being required here? How would that standard be implemented?
The end goal is for the response data to have at least the data defined in the interface (I'm really interested in checking if url's are not present).
...ANSWER
Answered 2020-May-26 at 00:15The end goal is for the response data to have at least the data defined in the interface (I'm really interested in checking if url's are not present).
Interfaces for json objects are just your promises (not validated at runtime) that the data will match what you say it will. TypeScript does not exist at runtime (its just JavaScript) and you cannot use interfaces are runtime.
SolutionYou can however write JavaScript validation code that * Returns a type to TypeScript * Ensures the object matches the type
An example of such a library is: https://github.com/pelotom/runtypes
QUESTION
I'm getting an Object is possibly 'undefined'.
error on every property check and access after story &&
on the code below. It doesn't make sense to me, since the first check is checking whether story
exists, or not. If it didn't exist, wouldn't the ternary just short circuit, and return null
? I'm new to typescript (and newish to react). I'd be happy to hear any suggestions! Thanks!
ANSWER
Answered 2020-May-25 at 02:53You should be passing a type argument to useState()
so it does not infer the state value as undefined
.
Here is an example
QUESTION
I'm getting an error preventing compilation. I can add any
to the StoriesComponent return type, and then everything works fine. However, I've heard this isn't good practice (I'm pretty new to TS). I want to return an array of Story elements here, so I'm sure how the compilation error message is pointing me in the right direction. Any ideas? Here it is for reference: JSX element type 'Element[]' is not a constructor function for JSX elements.Type 'Element[]' is missing the following properties from type 'Element': type, props, key
The linter is showing the error on the component below:
ANSWER
Answered 2020-May-25 at 00:22when you return storyIds.map((storyId: number, index) => { return ; });
from the StoriesContainer
component it returns an array of type JSX.Element[]
. You should be wrapping the returned value with React.Fragment
or a div
.
Current type definition for the component StoriesContainer
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