In-App UI

Expo

SDK

Reference

Expo SDK API reference

Complete API reference for the Knock Expo SDK.

In this section, you'll find the complete documentation for the components exposed in @knocklabs/expo, including the props available.

Note: You can see a reference for the methods available for the Knock class, as well as a Feed instance under the client JS docs.

Components

`KnockProvider`

The top-level provider that connects to Knock with the given API key and authenticates a user.

Props

Accepts KnockProviderProps

apiKey*string

The public API key for the environment

userId*string

The ID of the user for which to retrieve a feed

userTokenstring

A JWT that identifies the authenticated user, signed with the private key provided in the Knock dashboard. Required to secure your production environment. Learn more.

hoststring

A custom API host for Knock

i18nI18nContent

An optional set of translations to override the default `en` translations used in the feed components

`KnockFeedProvider`

The feed-specific provider that connects to a feed for that user. Must be a child of the KnockProvider.

Props

Accepts KnockFeedProviderProps:

feedId*string

The channel ID of the in-app feed to be displayed

defaultFeedOptionsFeedClientOptions

Set defaults for `tenant`, `has_tenant`, `source`, `archived` to scope all subsequent feed queries

colorModeColorMode

Sets the theme as either light or dark mode (defaults to light)

`KnockExpoPushNotificationProvider`

A context provider designed to streamline the integration of Expo push notifications within your React Native application. It facilitates the registration of device push tokens with the Knock backend, enabling the delivery of notifications. Moreover, this provider empowers developers to define custom behavior for handling notifications when they are received or interacted with, either by tapping or performing another action. By default, it provides a basic notification handling strategy, but it also allows for custom logic to be easily implemented according to specific application needs.

Note: Must be a child of the KnockProvider.

Props

Accepts KnockExpoPushNotificationProviderProps:

knockExpoChannelId*string

The channel ID of your Expo channel from Knock.

customNotificationHandlerPromise<Notifications.NotificationBehavior>

Allows developers to define custom behavior for handling notifications, including whether to show alerts, play sounds, or set badge counts

autoRegisterboolean

When true, the Expo provider automatically retrieves a push token from Expo and stores it as channel data on the user.

Hooks

`useKnock`

The KnockProvider exposes a useKnock hook for all child components.

Returns: Knock, an instance of the Knock JS client.

Example:

1import { KnockProvider, useKnock } from "@knocklabs/react";
2
3const App = ({ authenticatedUser }) => (
4  <KnockProvider
5    apiKey={process.env.KNOCK_PUBLIC_API_KEY}
6    userId={authenticatedUser.id}
7  >
8    <MyComponent />
9  </KnockProvider>
10);
11
12const MyComponent = () => {
13  const knock = useKnock();
14
15  return null;
16};

`useKnockFeed`

The KnockFeedProvider exposes a useKnockFeed hook for all child components.

Returns: KnockFeedProviderState

knockKnock

The instance of the Knock client

feedClientFeed

The instance of the authenticated Feed

useFeedStoreUseStore<FeedStoreState>

A zustand store containing the FeedStoreState

statusFilterStatus

Current value of the filter status for the Feed

setStatusfunction

A function to set the current FilterStatus

colorModeColorMode

The current theme color

Example:

1import {
2  KnockProvider,
3  KnockFeedProvider,
4  useKnockFeed,
5} from "@knocklabs/expo";
6
7const App = ({ authenticatedUser }) => (
8  <KnockProvider
9    apiKey={process.env.KNOCK_PUBLIC_API_KEY}
10    userId={authenticatedUser.id}
11  >
12    <KnockFeedProvider feedId={process.env.KNOCK_FEED_CHANNEL_ID}>
13      <MyFeedComponent />
14    </KnockFeedProvider>
15  </KnockProvider>
16);
17
18const MyFeedComponent = () => {
19  const { useFeedStore } = useKnockFeed();
20  const items = useFeedStore((state) => state.items);
21
22  return (
23    <View>
24      {items.map((item) => (
25        <NotificationCell key={item.id} item={item} />
26      ))}
27    </View>
28  );
29};

`useAuthenticatedKnockClient`

Creates an authenticated Knock client.

Returns: Knock instance, authenticated against the user

Example:

1import { useAuthenticatedKnockClient } from "@knocklabs/expo";
2
3const MyComponent = () => {
4  const knock = useAuthenticatedKnockClient(
5    process.env.KNOCK_PUBLIC_API_KEY,
6    user.id,
7    user.knockToken,
8  );
9
10  return null;
11};

`useNotifications`

Creates a Feed instance for the provided Knock client which creates a stateful, real-time connection to Knock to build in-app experiences.

Returns: Feed instance

Example:

1import {
2  useAuthenticatedKnockClient,
3  useNotifications,
4  useNotificationStore,
5} from "@knocklabs/expo";
6
7const MyComponent = () => {
8  const knock = useAuthenticatedKnockClient(
9    process.env.KNOCK_PUBLIC_API_KEY,
10    user.id,
11    user.knockToken,
12  );
13
14  const notificationFeed = useNotifications(
15    knock,
16    process.env.KNOCK_FEED_CHANNEL_ID,
17  );
18
19  const { metadata } = useNotificationStore(notificationFeed);
20
21  useEffect(() => {
22    notificationFeed.fetch();
23  }, [notificationFeed]);
24
25  return (
26    <View>
27      <Text>Total unread: {metadata.unread_count}</Text>
28    </View>
29  );
30};

`useTranslations`

Exposed under KnockI18nProvider child components.

Returns:

localestring

The current locale code (defaults to `en`)

t(key: string) => string

A helper function to get the value of a translation from the current `Translations`.

`useExpoPushNotifications`

The KnockExpoPushNotificationProvider exposes a useExpoPushNotifications hook for all child components, enabling them to interact with push notification functionalities and state.

Returns: KnockExpoPushNotificationContextType

expoPushTokenstring | null

The Expo push token for the current device.

registerForPushNotifications() => Promise<void>

A function to initiate the push notification registration process.

registerPushTokenToChannel(token: string, channelId: string) => Promise<void>

Registers the device's push token with a specific channel in the Knock backend.

unregisterPushTokenFromChannel(token: string, channelId: string) => Promise<void>

Removes the device's push token from a specific channel in the Knock backend.

onNotificationReceived(handler: (notification: Notifications.Notification) => void) => void

Sets a custom handler for notifications received while the app is in the foreground.

onNotificationTapped(handler: (response: Notifications.NotificationResponse) => void) => void

Sets a custom handler for user interactions with notifications.

Example:

1import React, { useEffect } from "react";
2import { View, Text } from "react-native";
3import {
4  KnockExpoPushNotificationProvider,
5  useExpoPushNotifications,
6} from "@knocklabs/expo";
7
8const App = () => (
9  <KnockExpoPushNotificationProvider knockExpoChannelId="{YOUR_CHANNEL_ID}">
10    <MyComponent />
11  </KnockExpoPushNotificationProvider>
12);
13
14const MyComponent = () => {
15  const { expoPushToken, onNotificationReceived, onNotificationTapped } =
16    useExpoPushNotifications();
17
18  useEffect(() => {
19    onNotificationReceived((notification) => {
20      console.log("Notification Received: ", notification);
21    });
22
23    onNotificationTapped((response) => {
24      console.log("Notification Tapped: ", response);
25    });
26  }, []);
27
28  return (
29    <View>
30      <Text>Expo Push Token: {expoPushToken}</Text>
31    </View>
32  );
33};

Types

`I18nContent`

Used to set translations available in the child components exposed under KnockFeedProvider and KnockSlackProvider. Used in the useTranslations hook.

Note: locale must be a valid locale code.

1interface Translations {
2  readonly emptyFeedTitle: string;
3  readonly emptyFeedBody: string;
4  readonly notifications: string;
5  readonly poweredBy: string;
6  readonly markAllAsRead: string;
7  readonly archiveNotification: string;
8  readonly all: string;
9  readonly unread: string;
10  readonly read: string;
11  readonly unseen: string;
12
13  readonly slackConnectChannel: string;
14  readonly slackChannelId: string;
15  readonly slackConnecting: string;
16  readonly slackDisconnecting: string;
17  readonly slackConnect: string;
18  readonly slackConnected: string;
19  readonly slackConnectContainerDescription: string;
20  readonly slackSearchbarDisconnected: string;
21  readonly slackSearchbarNoChannelsConnected: string;
22  readonly slackSearchbarNoChannelsFound: string;
23  readonly slackSearchbarChannelsError: string;
24  readonly slackSearchChannels: string;
25  readonly slackConnectionErrorOccurred: string;
26  readonly slackConnectionErrorExists: string;
27  readonly slackChannelAlreadyConnected: string;
28  readonly slackError: string;
29  readonly slackDisconnect: string;
30  readonly slackChannelSetError: string;
31  readonly slackAccessTokenNotSet: string;
32  readonly slackReconnect: string;
33}
34
35interface I18nContent {
36  readonly translations: Partial<Translations>;
37  readonly locale: string;
38}