How can I get the color information of a pixel in React Native?
I’m trying to implement color picking through the device camera in a project with expo-camera. In order to do this, I need to access the color information pertaining to a specific pixel on the screen,...
View ArticleHow do I Figure out React Navigation Return Types?
I'm used to strongly typed languages, but still very new to TypeScript and I'm having difficulty with understanding the types of different methods and such from other libraries. But I'm using the...
View ArticlegetTheme() native base Type
I'm using a custom Native Base style theme as described in this link.https://docs.nativebase.io/Customize.html#theaming-nb-headrefImports:import material from...
View ArticleHow to cast inside .tsx file?
I wrote some code inside a .tsx file and I need to cast a variable but it doesn't work and I don't understand why.That is my code :let a : number = 2;let b : string = a as unknown as...
View ArticleWhat can i do about it
enter code hereimport React from 'react';import { StatusBar } from 'expo-status-bar';import { StyleSheet, Text, View, Dimensions } from 'react-native';import MapView, {Marker, Callout, PROVIDER_GOOGLE...
View ArticleReact Native Typescript Typing for "Backwards" ScrollView
I've got a ScrollView which was working first as JavaScript and then also as TypeScript; this ScrollView uses the ref property to capture a reference of the ScrollView and then invoke one of its...
View ArticleTouchableOpacity onPress() only one button is working
Not sure why only the first onPress is working, other onPress no response..., just use the same way to wrap the function, but other onPress didn't respond at allconst ToMainScreen = () => {...
View ArticleReact-Native : is it possible to cast a Video element into HTMLMediaElement?
Inside my React-Native code, I recover a Video element from reactxp-video package but then I need to give this element to a JS script but this script needs an HTMLMediaElement. I tried to cast my Video...
View ArticleRN FlatList with Typescript and Styled Components
SO community,I can't figure out the correct type definition for an RN FlatList styled with Styled Components in TypescriptSo I have type IProduct like thatinterface IProduct { id: string; name:...
View ArticleReact Native TypeSrcript Function Returning JSX.Element Type
I've got a TypeScript function which returns a React Native View.import React from "react";import JSX, {View} from "react-native";class DummyClass { static getView() { return (<View style={{flex:...
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React Native Component Exception: undefined is not an object (evaluating'_this')
Iam working on face recognition app using react native 0.63. I am runing my project using react-native run-android. I get Component Exception undefined is not an object(evaluating '_this'). I am new to...
View ArticleNpm install is giving Error in React-Native
I was trying to run npm install on a my project i deleted node modules to reinstall it again but I am getting a lot of errors on my terminal. All i did was npm install inside the supposed folder but...
View ArticleTypescript exported enum is undefined
I'm writing some typescript type definitions for an existing react native module.What I've done so far:added path to my index.d.ts file in the react native module's package.json:{"name":...
View ArticleHow to use forwardRef with FunctionComponent in React Native using TypeScript
I've looked at many of the docs and examples but I still can't seem to quite understand how to use forwardRef with a functional component with TypeScript in React Native. Below is an example where I...
View ArticleReact native ScrollView resets positon on setState
I have a ScrollView with buttons on it. I populate ScrollView dynamicaly. After I press on the buttons inside the ScrollView, I'm changing the state of the current selected index and the posiotion of...
View ArticleHow to optimize App in ReactJS on re-renders
I have to optimize this App here, How can I implement or pass onDelete to Child so I don't have new function on each re-render? (I am not allowed to change the child component)function App() { const...
View ArticleGetting TS Error: Property 'user' does not exist on type 'IAuth | null'
I am using context for Auth in my simple typescript app.My context declaration is in the fileAuthProvider.tsx, which looks like:import React, { createContext, useState } from 'react';import auth from...
View ArticleCan't run jest tests on my react native application [React Native + TypeScript]
I'm trying to run tests on this project for the first time, but i having some problems with the modules, thats the error i'm having:FAIL src/components/text/index.test.tsx● Test suite failed to run...
View ArticleTypeScript issues when creating ref for React Native TextInput
I came across an issue when defining refs i.e.inputRef = React.createRef(null)//...const someFunction () => { if (this.inputRef && this.inputRef.current) { this.inputRef.current.focus()...
View ArticleHow can i convert node props in JS Code to TS Code?
const SliderContainer = ({node, time}) => (<Container> {node.map(program=>(<Slide key={program.id} id={program.id} title={program.title? trimText(program.title,8):...
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