GT2/Ejectable/node_modules/@react-navigation/routers/lib/module/TabRouter.js

import { nanoid } from 'nanoid/non-secure';
import BaseRouter from './BaseRouter';
const TYPE_ROUTE = 'route';
export const TabActions = {
  jumpTo(name, params) {
    return {
      type: 'JUMP_TO',
      payload: {
        name,
        params
      }
    };
  }

};

const getRouteHistory = (routes, index, backBehavior, initialRouteName) => {
  const history = [{
    type: TYPE_ROUTE,
    key: routes[index].key
  }];
  let initialRouteIndex;

  switch (backBehavior) {
    case 'order':
      for (let i = index; i > 0; i--) {
        history.unshift({
          type: TYPE_ROUTE,
          key: routes[i - 1].key
        });
      }

      break;

    case 'firstRoute':
      if (index !== 0) {
        history.unshift({
          type: TYPE_ROUTE,
          key: routes[0].key
        });
      }

      break;

    case 'initialRoute':
      initialRouteIndex = routes.findIndex(route => route.name === initialRouteName);
      initialRouteIndex = initialRouteIndex === -1 ? 0 : initialRouteIndex;

      if (index !== initialRouteIndex) {
        history.unshift({
          type: TYPE_ROUTE,
          key: routes[initialRouteIndex].key
        });
      }

      break;

    case 'history':
      // The history will fill up on navigation
      break;
  }

  return history;
};

const changeIndex = (state, index, backBehavior, initialRouteName) => {
  let history;

  if (backBehavior === 'history') {
    const currentKey = state.routes[index].key;
    history = state.history.filter(it => it.type === 'route' ? it.key !== currentKey : false).concat({
      type: TYPE_ROUTE,
      key: currentKey
    });
  } else {
    history = getRouteHistory(state.routes, index, backBehavior, initialRouteName);
  }

  return { ...state,
    index,
    history
  };
};

export default function TabRouter({
  initialRouteName,
  backBehavior = 'history'
}) {
  const router = { ...BaseRouter,
    type: 'tab',

    getInitialState({
      routeNames,
      routeParamList
    }) {
      const index = initialRouteName !== undefined && routeNames.includes(initialRouteName) ? routeNames.indexOf(initialRouteName) : 0;
      const routes = routeNames.map(name => ({
        name,
        key: "".concat(name, "-").concat(nanoid()),
        params: routeParamList[name]
      }));
      const history = getRouteHistory(routes, index, backBehavior, initialRouteName);
      return {
        stale: false,
        type: 'tab',
        key: "tab-".concat(nanoid()),
        index,
        routeNames,
        history,
        routes
      };
    },

    getRehydratedState(partialState, {
      routeNames,
      routeParamList
    }) {
      var _state$routes, _state$index, _state$history$filter, _state$history;

      let state = partialState;

      if (state.stale === false) {
        return state;
      }

      const routes = routeNames.map(name => {
        const route = state.routes.find(r => r.name === name);
        return { ...route,
          name,
          key: route && route.name === name && route.key ? route.key : "".concat(name, "-").concat(nanoid()),
          params: routeParamList[name] !== undefined ? { ...routeParamList[name],
            ...(route ? route.params : undefined)
          } : route ? route.params : undefined
        };
      });
      const index = Math.min(Math.max(routeNames.indexOf((_state$routes = state.routes[(_state$index = state === null || state === void 0 ? void 0 : state.index) !== null && _state$index !== void 0 ? _state$index : 0]) === null || _state$routes === void 0 ? void 0 : _state$routes.name), 0), routes.length - 1);
      const history = (_state$history$filter = (_state$history = state.history) === null || _state$history === void 0 ? void 0 : _state$history.filter(it => routes.find(r => r.key === it.key))) !== null && _state$history$filter !== void 0 ? _state$history$filter : [];
      return changeIndex({
        stale: false,
        type: 'tab',
        key: "tab-".concat(nanoid()),
        index,
        routeNames,
        history,
        routes
      }, index, backBehavior, initialRouteName);
    },

    getStateForRouteNamesChange(state, {
      routeNames,
      routeParamList
    }) {
      const routes = routeNames.map(name => state.routes.find(r => r.name === name) || {
        name,
        key: "".concat(name, "-").concat(nanoid()),
        params: routeParamList[name]
      });
      const index = Math.max(0, routeNames.indexOf(state.routes[state.index].name));
      let history = state.history.filter( // Type will always be 'route' for tabs, but could be different in a router extending this (e.g. drawer)
      it => it.type !== 'route' || routes.find(r => r.key === it.key));

      if (!history.length) {
        history = getRouteHistory(routes, index, backBehavior, initialRouteName);
      }

      return { ...state,
        history,
        routeNames,
        routes,
        index
      };
    },

    getStateForRouteFocus(state, key) {
      const index = state.routes.findIndex(r => r.key === key);

      if (index === -1 || index === state.index) {
        return state;
      }

      return changeIndex(state, index, backBehavior, initialRouteName);
    },

    getStateForAction(state, action, {
      routeParamList
    }) {
      switch (action.type) {
        case 'JUMP_TO':
        case 'NAVIGATE':
          {
            let index = -1;

            if (action.type === 'NAVIGATE' && action.payload.key) {
              index = state.routes.findIndex(route => route.key === action.payload.key);
            } else {
              index = state.routes.findIndex(route => route.name === action.payload.name);
            }

            if (index === -1) {
              return null;
            }

            return changeIndex({ ...state,
              routes: action.payload.params !== undefined ? state.routes.map((route, i) => {
                if (i !== index) {
                  return route;
                }

                let params;

                if (action.type === 'NAVIGATE' && action.payload.merge === false) {
                  params = routeParamList[route.name] !== undefined ? { ...routeParamList[route.name],
                    ...action.payload.params
                  } : action.payload.params;
                } else {
                  params = action.payload.params ? { ...route.params,
                    ...action.payload.params
                  } : route.params;
                }

                return params !== route.params ? { ...route,
                  params
                } : route;
              }) : state.routes
            }, index, backBehavior, initialRouteName);
          }

        case 'GO_BACK':
          {
            if (state.history.length === 1) {
              return null;
            }

            const previousKey = state.history[state.history.length - 2].key;
            const index = state.routes.findIndex(route => route.key === previousKey);

            if (index === -1) {
              return null;
            }

            return { ...state,
              history: state.history.slice(0, -1),
              index
            };
          }

        default:
          return BaseRouter.getStateForAction(state, action);
      }
    },

    shouldActionChangeFocus(action) {
      return action.type === 'NAVIGATE';
    },

    actionCreators: TabActions
  };
  return router;
}
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