@react-navigation/core/lib/module/createNavigationContainerRef.js

Core utilities for building navigators

"use strict";

import { CommonActions } from '@react-navigation/routers';
export const NOT_INITIALIZED_ERROR = "The 'navigation' object hasn't been initialized yet. This might happen if you don't have a navigator mounted, or if the navigator hasn't finished mounting. See https://reactnavigation.org/docs/navigating-without-navigation-prop#handling-initialization for more details.";
export function createNavigationContainerRef() {
  const methods = [...Object.keys(CommonActions), 'addListener', 'removeListener', 'resetRoot', 'dispatch', 'isFocused', 'canGoBack', 'getRootState', 'getState', 'getParent', 'getCurrentRoute', 'getCurrentOptions'];
  const listeners = {};
  const removeListener = (event, callback) => {
    if (listeners[event]) {
      listeners[event] = listeners[event].filter(cb => cb !== callback);
    }
  };
  let current = null;
  const ref = {
    get current() {
      return current;
    },
    set current(value) {
      current = value;
      if (value != null) {
        Object.entries(listeners).forEach(([event, callbacks]) => {
          callbacks.forEach(callback => {
            value.addListener(event, callback);
          });
        });
      }
    },
    isReady: () => {
      if (current == null) {
        return false;
      }
      return current.isReady();
    },
    ...methods.reduce((acc, name) => {
      acc[name] = (...args) => {
        if (current == null) {
          switch (name) {
            case 'addListener':
              {
                const [event, callback] = args;
                listeners[event] = listeners[event] || [];
                listeners[event].push(callback);
                return () => removeListener(event, callback);
              }
            case 'removeListener':
              {
                const [event, callback] = args;
                removeListener(event, callback);
                break;
              }
            default:
              console.error(NOT_INITIALIZED_ERROR);
          }
        } else {
          // @ts-expect-error: this is ok
          return current[name](...args);
        }
      };
      return acc;
    }, {})
  };
  return ref;
}
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