Redux middleware and utils for React Navigation. 

Redux middleware and utils for React Navigation

ashoat

react-navigation-redux-helpers

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		{
		"name": "react-navigation-redux-helpers",
		"description": "Redux middleware and utils for React Navigation",
		"version": "1.0.1",
		"version": "1.0.2",
		"main": "src/index.js",
		@@ -18,3 +18,8 @@ "author": "Ashoat Tevosyan (https://github.com/ashoat)",
		},
		"files": [ "src" ]
		"files": [
		"src"
		],
		"peerDependencies": {
		"react-navigation": "^1.1.2"
		}
		}

		// @flow

		import type {
		NavigationEventCallback,
		NavigationState,
		} from 'react-navigation';
		import type { Middleware } from 'redux';
		import { createNavigationReducer } from './reducer';

		import invariant from 'invariant';

		const reduxSubscribers = new Map();

		function createReactNavigationReduxMiddleware<State: {}>(
		key: string,
		navStateSelector: (state: State) => NavigationState,
		): Middleware<State, , > {
		reduxSubscribers.set(key, new Set());
		return store => next => action => {
		const oldState = store.getState();
		const result = next(action);
		const newState = store.getState();
		const subscribers = reduxSubscribers.get(key);
		invariant(subscribers, `subscribers set should exist for ${key}`);
		subscribers.forEach(subscriber =>
		subscriber({
		type: 'action',
		action,
		state: navStateSelector(newState),
		lastState: navStateSelector(oldState),
		})
		);
		return result;
		};
		}

		function createReduxBoundAddListener(key: string) {
		invariant(
		reduxSubscribers.has(key),
		"Cannot listen for a key that isn't associated with a Redux store. " +
		'First call `createReactNavigationReduxMiddleware` so that we know ' +
		'when to trigger your listener.'
		);
		return (eventName: string, handler: NavigationEventCallback) => {
		if (eventName !== 'action') {
		return { remove: () => {} };
		}
		const subscribers = reduxSubscribers.get(key);
		invariant(subscribers, `subscribers set should exist for ${key}`);
		subscribers.add(handler);
		return {
		remove: () => {
		subscribers.delete(handler);
		},
		};
		};
		}

		export {
		createReactNavigationReduxMiddleware,
		createReduxBoundAddListener,
		};
		export * from './types';
		export * from './middleware';
		export { createNavigationReducer };

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