Error TS2322: The specified type Login cannot be assigned to the given type

I've been facing an issue while working on my app in react native. The error message I keep encountering is as follows:

TS2322: Type 'typeof Login' is not assignable to type
ScreenComponentType<ParamListBase, "Login"> | undefined
Type 'typeof Login' is not assignable to type ComponentClass<{}, any>
Types of parameters 'props' and 'props' are incompatible.
Property 'navigation' is missing in type '{}' but required in type 'LoginProps'

To troubleshoot this, I turned to chat GPT for guidance on debugging the code.

My app.tsx:

import * as React from 'react';
import { NavigationContainer } from '@react-navigation/native';
import { createNativeStackNavigator } from '@react-navigation/native-stack';
import { StatusBar } from 'react-native';
import { Footer } from './src/component/footer';
import { Home } from './src/screen/home';
import { Buy } from './src/screen/buy';
import { Shop } from './src/screen/shop';
import Login from "./src/screen/login";

const Stack = createNativeStackNavigator();

function App(): React.JSX.Element {
    return (
        <NavigationContainer>
            <StatusBar />
            <Stack.Navigator
                screenOptions={{
                    headerShown: false,
                }}
                initialRouteName="Login"
            >
                <Stack.Screen name="Home" options={{ animation: 'none' }} component={Home} />
                <Stack.Screen name="Buy" options={{ animation: 'none' }} component={Buy} />
                <Stack.Screen name="Shop" options={{ animation: 'none' }} component={Shop} />
                <Stack.Screen name="Login" options={{ animation: 'none' }} component={Login} />
            </Stack.Navigator>
        </NavigationContainer>
    );
}

export default App;

My login.tsx:


import React from "react";
// Rest of the code for the Login component...

types.ts:

export type RootStackParamList = {
    Home: undefined;
    Buy: undefined;
    Shop: undefined;
    Login: undefined;
};

If you still need help troubleshooting your code, you can access the TypeScript Playground here.

In case you're not able to resolve the error with the prior suggestions, feel free to reach out to chat GPT for further assistance: . Regardless, provide more details like the full error message or relevant parts of your code to expedite a resolution.

Answer №1

Issue

The specification for the component prop is outlined by the ScreenComponentType type:

type ScreenComponentType<
  ParamList extends ParamListBase,
  RouteName extends keyof ParamList
> =
  | React.ComponentType<{
      route: RouteProp<ParamList, RouteName>;
      navigation: any;
    }>
  | React.ComponentType<{}>;

source

This definition represents a union type, signified by multiple types separated by a vertical bar (|). TypeScript determines the valid type from this union based on available information. Your error message indicates which member of the union TypeScript selected (emphasis added):

Property 'navigation' is missing in type '{}' but required in type 'LoginProps'

It signifies that TypeScript chose the second member from the union:

React.ComponentType<{}>

There are two reasons for this selection:

  1. ParamList was not specified (due to no type provided to the ParamList argument of createNativeStackNavigator), preventing the passing of ParamList to RouteProp and thus failing to fulfill the requirement of the first union member.
  2. LoginProps did not define a route prop as mandated by the first union member.

Resolution

To resolve this issue, follow these steps:

  1. Specify RootStackParamList as the type argument for createNativeStackNavigator's ParamList.

    const Stack = createNativeStackNavigator<RootStackParamList>();
    
  2. Next, either:

    • Explicitly declare the route property within LoginProps (example):
      import { RouteProp } from '@react-navigation/native';
      import { NativeStackNavigationProp } from '@react-navigation/native-stack';
      
      // ...
      
      interface LoginProps {
        navigation: NativeStackNavigationProp<RootStackParamList, "Login">;
        route: RouteProp<RootStackParamList, "Login">;
      }
      
    • Or, utilize the NativeStackScreenProps helper type from React Navigation (example):
      import { NativeStackScreenProps } from '@react-navigation/native-stack';
      
      // ...
      
      interface LoginProps extends NativeStackScreenProps<RootStackParamList, "Login"> {}
      

Additional Resources

Answer №2

This is the approach that has worked well for me:

  1. Switch to using StackScreenProps in place of NativeStackNavigationProp, and update the type definition for LoginProps.
  2. Include RootStackParamList when creating a new stack navigator using createNativeStackNavigator.

To see a detailed example, check out this TypeScript playground link.

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