@react-navigation/routers/lib/module/BaseRouter.js

Routers to help build custom navigators

"use strict";

import { nanoid } from 'nanoid/non-secure';
function getStateForAction(state, action) {
  switch (action.type) {
    case 'SET_PARAMS':
    case 'REPLACE_PARAMS':
      {
        const index = action.source ? state.routes.findIndex(r => r.key === action.source) : state.index;
        if (index === -1) {
          return null;
        }
        return {
          ...state,
          routes: state.routes.map((r, i) => i === index ? {
            ...r,
            params: action.type === 'REPLACE_PARAMS' ? action.payload.params : {
              ...r.params,
              ...action.payload.params
            }
          } : r)
        };
      }
    case 'RESET':
      {
        const nextState = action.payload;
        if (nextState == null) {
          return null;
        }
        const routeNamesSet = new Set(state.routeNames);
        if (nextState.routes.length === 0 || nextState.routes.some(route => !routeNamesSet.has(route.name))) {
          return null;
        }
        if (nextState.stale === false) {
          if (state.routeNames.length !== nextState.routeNames.length || nextState.routeNames.some(name => !routeNamesSet.has(name)) || !Number.isInteger(nextState.index) || nextState.index < 0 || nextState.index >= nextState.routes.length) {
            return null;
          }
          return {
            ...nextState,
            routes: nextState.routes.map(route => 'key' in route && route.key ? route : {
              ...route,
              key: `${route.name}-${nanoid()}`
            })
          };
        }
        return nextState;
      }
    default:
      return null;
  }
}

/**
 * Base router object that can be used when writing custom routers.
 * This provides few helper methods to handle common actions such as `RESET`.
 */
export const BaseRouter = {
  getStateForAction,
  shouldActionChangeFocus(action) {
    return action.type === 'NAVIGATE' || action.type === 'NAVIGATE_DEPRECATED';
  }
};
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