Type checking with TypeScript

React Navigation exports type definitions for TypeScript projects, which can be used to type check screens, navigation options, and the navigation prop.

Type checking navigation prop

The navigation prop can be annotated to provide type checking for params and basic type checking for the available methods.

The type depends on the navigator that renders the screen. For example, the navigation prop provided by createStackNavigator can be used like:

import { NavigationStackProp } from 'react-navigation-stack';

type Props = {
  navigation: NavigationStackProp<{ userId: string }>;
};

class ProfileScreen extends React.Component<Props> {
  // ...
}

The types take a generic for the params object.

Along with NavigationStackProp, each navigator exports its own type for navigation prop:

• NavigationStackProp for createStackNavigator from react-navigation-stack
• NavigationTabProp for createBottomTabNavigator and createMaterialTopTabNavigator from react-navigation-tabs
• NavigationDrawerProp for createDrawerNavigator from react-navigation-drawer

Type checking all props for a screen

A screen receives the theme and screenProps props along with the navigation prop. Instead of needing to annotate each property, they can be consolidated.

The type depends on the navigator that renders the screen. For example, for a screen in createStackNavigator:

import { NavigationStackScreenProps } from 'react-navigation-stack';

type Params = { userId: string };

type ScreenProps = { language: string };

class ProfileScreen extends React.Component<
  NavigationStackScreenProps<Params, ScreenProps>
> {
  // ...
}

The Params and ScreenProps generics are optional, and can be omitted if you're not using them.

Along with NavigationStackScreenProps, each navigator exports its own type for navigation prop:

• NavigationStackScreenProps for createStackNavigator from react-navigation-stack
• NavigationTabScreenProps for createBottomTabNavigator and createMaterialTopTabNavigator from react-navigation-tabs
• NavigationDrawerScreenProps for createDrawerNavigator from react-navigation-drawer

Type checking navigationOptions

Different navigators accept different set of options for the screen. They are specified in the navigationOptions static property which can be annotated to provide type-checking:

import { NavigationStackOptions } from 'react-navigation-stack';

// ...

class ProfileScreen extends React.Component<Props> {
  static navigationOptions: NavigationStackOptions = {
    headerTitle: 'Profile',
  };

  // ...
}

Along with NavigationStackOptions, each navigator exports its own type for navigation prop:

• NavigationStackOptions for createStackNavigator from react-navigation-stack
• NavigationBottomTabOptions for createBottomTabNavigator from react-navigation-tabs
• NavigationMaterialTabOptions for createMaterialTopTabNavigator from react-navigation-tabs
• NavigationDrawerOptions for createDrawerNavigator from react-navigation-drawer

Type checking screen components

Screens can be annotated to provide type-checking for the props it receives, as well as navigationOptions in a single type annotation.

The type depends on the navigator that renders the screen. For example, for a screen in createStackNavigator:

import { NavigationStackScreenComponent } from 'react-navigation-stack';

type Params = { userId: string };

type ScreenProps = { language: string };

const ProfileScreen: NavigationStackScreenComponent<Params, ScreenProps> = (
  props
) => {
  // ...
};

ProfileScreen.navigationOptions = {
  headerTitle: 'Profile',
};

The Params and ScreenProps generics are optional, and can be omitted if you're not using them.

Along with NavigationStackScreenComponent, each navigator exports its own type for navigation prop:

• NavigationStackScreenComponent for createStackNavigator from react-navigation-stack
• NavigationBottomTabScreenComponent for createBottomTabNavigator from react-navigation-tabs
• NavigationMaterialTabScreenComponent for createMaterialTopTabNavigator from react-navigation-tabs
• NavigationDrawerScreenComponent for createDrawerNavigator from react-navigation-drawer