A common error which occurs in react-navigation, when using TypeScript, is: Argument of type ‘string’ is not assignable to parameter of type ‘{ key: string; params?: undefined; merge?: boolean | undefined; } | { name: never; key?: string | undefined; params: never; merge?: boolean | undefined; }’ What could this be caused by? Answer This occurs when types for specific
Tag: react-native
I receive an undefined value when I pass the value of a variable through props from a parent component to a child component
I create a variable pointsFilter in app.js and through props I send the value to a child component in this case the component is Map but when I want to extract the value I get undefined and when i do a console.log in app i get the value but when i do the same in map.js i get undefined app.js
React Native – Assign value from promise to variable
I have a couple repositories containing database calls such as getUser and getUsers. Now I export those repositories as followed: This leads to me having to do things like this: The intellisense says userRepository is: Is there a way how to assign the functions to userRepository without me having to do any then calls on it? I’d like to just
Defining hooks inside an array
I would like to create a bunch of filters to pause or play my Video. My implementation is something like as shown below: I know defining hooks inside an if condition is not correct. But how about defining them as above? Could it be done in a better way? Answer In order for React to correctly preserve the state of
React Native, FlatList does not output my list correctly
I have this quite easy items where I normally loop over with map: The above code works fine, but as I learned, it is better do use FlatList in my components do render something in a loop. So I tried the following: The correct amount of items are rendered, but unfortunately, none of the props gets passed to the Child
React native, the useEffect on a object state not working
Here is the code before the render So the state of HHDays stays null and the render shows an error on the frist {HHDays.allWeek.from} TypeError: null is not an object (evaluating ‘HHDays.allWeek’) Answer useEffect is called after the component was rendered. So when the code reaches that line the first time around, it tries to read null.from. Maybe you’d want
React execute a function at varying time intervals [closed]
Closed. This question needs details or clarity. It is not currently accepting answers. Want to improve this question? Add details and clarify the problem by editing this post. Closed 7 months ago. Improve this question I have an API which returns a list of objects. Each of these objects have a field called timeOut which contains some time interval in
Nested Navigation in React Native not compiling
I’m new to nested navigation. I have tried to follow the principles here – however I am getting the error Couldn’t find a navigation object. Is your component inside NavigationContainer? I have brought the ‘Screens’ into the main App.js for ease of debugging and sharing code. Below is my code. I am trying to have a home screen with a
Why are showing blank page in reactjs?
I am using class and constructor in react-js but this program does not error is thrown in console. show a message only blank. what is wrong? Answer You need to pass it as <Component />. And Still doesn’t work then add your index.html, there might be the issue then. PS: If you want to render only element only html element
How good is to apply React Context API for all screens
Currently I have four contexts that wrap all my routes (as shown bellow) so that I don’t have lost providers all around my app screens and components. As far as I know, when I modify the value of a context variable, every component that uses it will update too, what can lead to memory problems, but my question is: if