How to use HoC with React Native
I have an listing app where users can add items for multiple categories, when they want to add new record, there are 3 related screens with this particular feature. All of those screens have...
View ArticleHow to define the mapDispatchToProps type of redux thunk function
Follow the official doc, I make a login typescript like thunk function. function loginApi(user: UserState) { return fetch( `${baseUrl}/login?user=${user.userName}&pwd=${user.pwd}` ) .then(res...
View ArticleUsing functions within React Native StyleSheet with Typescript
Often times I want to do something like const styles = StyleSheet.create({ square: (size: number) => ({ width: size, height: size, }), }) Now this doesn't work, because I get Type '(size: number)...
View ArticleClik here to view.
React Native TypeScript: Unable to resolve module (but it exists)
I have a fresh React Native 0.61.1 project with TypeScript. It used to display the new project welcome screen perfectly. I've added a class, tried to import it (it even autocompleted), but it says the...
View ArticleTS: Disable single equals in if condition
How to disable single equals in an if statement using typescript? Recently in a codebase that I was debugging, there was and RCTView error on android however that error should be on ios. The issue was...
View ArticleHow to get types for expo-sqlite?
In version 33 of the expo sdk, sqlite got moved to it's own package, expo-sqlite, and now I can't get the types to load. Instead of import {SQLite} from 'expo'; I have import {SQLite} from...
View Articlehow can I resolve "JavaScript heap out of memory"?
When I run "yarn test tests/screens/Home/Home.js", I encountered "javascript memory leak" error. and this file is created. File name is "report.20191007.162344.626.0.001.json" What Can I Do? {...
View ArticleClik here to view.
Vscode breakpoints in TypeScript files not hit in React Native
I have a React Native 0.61 project, TypeScript 3.6.2 and Vscode 1.38.1. Here is my launch config: { "name": "Debug iOS", "cwd": "${workspaceFolder}", "type": "reactnative", "request": "launch",...
View ArticleWait Until Fetch Promise data is available and pass to react native component...
I am very new to this style of coding. I am trying to not use express and doing some fetching in the front end. If things should never be done this way then let me know. I know my endpoint is working...
View ArticleHow to write proper `Keyboard.addListener` in React Native with TypeScript?
I am rewriting a tutorial to TypeScript. It should console.log after componentDidMount, but it doesn't. It doesn't show any error either. What am I doing wrong? Here's my code (minimized it for you):...
View ArticleReact Native stylesheet merge: Spread types may only be created from object...
I'm trying to merge an existing style with my extra styling in React Native's regular StyleSheet.create method: const styles = StyleSheet.create({ blurView:{ ...StyleSheet.absoluteFill, borderRadius:...
View ArticleTypeError: Cannot read property 'viewManagersNames' of undefined -...
I'm trying to integrate Jest unit testing with Enzyme on my React-Native Typescript package, but after reading docs and tutorials, I can't seem to make it work. The problem only happens when using...
View Articlereact-native - What should we do with file.snap
I am researching about testing using jest. Luckily, I am able to use jest for testing view. However, I don't know how useful is the tsx.snap file. Below is the code: exports[`renders correctly with...
View ArticleTypescript definitions for Animated.View's style prop
I have component whose Props interface extends ViewProps from React Native, i.e: export interface Props extends ViewProps { // Custom props } Naturally, this extends the style prop. There is one...
View ArticleFailed to run React Native Web project
I am developing a React Native app for web, ios and android with React Native for Web, Typescript and Nativebase UI library based on this starter project template on github....
View ArticleCannot find a local module using TypeScript with React Native
I'm doing a mobile application using React Native (0.61.2) and TypeScript (3.6.4). I'm following advices from this article to have a R namespace, just like how Android does for assets with the...
View ArticleHow to access a function in a stateless component?
Can I access a function in a stateless component? I know that the function can be accessable if change to class component. However, as I know. Hooks is incomptable with class component. Please feel...
View Articlereact-native run-android getting error : A problem occurred evaluating...
I have created a new project by using react-native init but I'm getting the following error FAILURE: Build failed with an exception. * Where: Build file...
View Articlehow to solve Property 'navigation' does not exist on type 'Readonly &
I have the following two pieces of code: CustomHeader.tsx import { View, StyleSheet, Button } from 'react-native'; import { NavigationScreenProps } from 'react-navigation'; import Icon from...
View ArticleWhy does my React Native app build successfully despite TypeScript compiler...
I've recently started using TypeScript with Expo. I've done all the linter/formatter integrations like typescript-eslint so I can catch most of the errors during coding. To check if the code compiles,...
View Article