@react-navigation/native/lib/module/useLinking.native.js

React Native integration for React Navigation

import * as React from 'react';
import { Linking, Platform } from 'react-native';
import { getActionFromState, getStateFromPath as getStateFromPathDefault } from '@react-navigation/core';
let isUsingLinking = false;
export default function useLinking(ref, {
  prefixes,
  config,
  getStateFromPath = getStateFromPathDefault
}) {
  React.useEffect(() => {
    if (isUsingLinking) {
      throw new Error("Looks like you are using 'useLinking' in multiple components. This is likely an error since deep links should only be handled in one place to avoid conflicts." + (Platform.OS === 'android' ? "\n\nIf you're not using it in multiple components, ensure that you have set 'android:launchMode=singleTask' in the '<activity />' section of the 'AndroidManifest.xml' file to avoid launching multiple activities which run multiple instances of the root component." : ''));
    } else {
      isUsingLinking = true;
    }

    return () => {
      isUsingLinking = false;
    };
  }); // We store these options in ref to avoid re-creating getInitialState and re-subscribing listeners
  // This lets user avoid wrapping the items in `React.useCallback` or `React.useMemo`
  // Not re-creating `getInitialState` is important coz it makes it easier for the user to use in an effect

  const prefixesRef = React.useRef(prefixes);
  const configRef = React.useRef(config);
  const getStateFromPathRef = React.useRef(getStateFromPath);
  React.useEffect(() => {
    prefixesRef.current = prefixes;
    configRef.current = config;
    getStateFromPathRef.current = getStateFromPath;
  }, [config, getStateFromPath, prefixes]);
  const extractPathFromURL = React.useCallback(url => {
    for (const prefix of prefixesRef.current) {
      if (url.startsWith(prefix)) {
        return url.replace(prefix, '');
      }
    }

    return undefined;
  }, []);
  const getInitialState = React.useCallback(async () => {
    const url = await Linking.getInitialURL();
    const path = url ? extractPathFromURL(url) : null;

    if (path) {
      return getStateFromPathRef.current(path, configRef.current);
    } else {
      return undefined;
    }
  }, [extractPathFromURL]);
  React.useEffect(() => {
    const listener = ({
      url
    }) => {
      const path = extractPathFromURL(url);
      const navigation = ref.current;

      if (navigation && path) {
        const state = getStateFromPathRef.current(path, configRef.current);

        if (state) {
          const action = getActionFromState(state);

          if (action !== undefined) {
            navigation.dispatch(action);
          } else {
            navigation.resetRoot(state);
          }
        }
      }
    };

    Linking.addEventListener('url', listener);
    return () => Linking.removeEventListener('url', listener);
  }, [extractPathFromURL, ref]);
  return {
    getInitialState
  };
}
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