npm package discovery and stats viewer.

Discover Tips

  • General search

    [free text search, go nuts!]

  • Package details

    pkg:[package-name]

  • User packages

    @[username]

Sponsor

Optimize Toolset

I’ve always been into building performant and accessible sites, but lately I’ve been taking it extremely seriously. So much so that I’ve been building a tool to help me optimize and monitor the sites that I build to make sure that I’m making an attempt to offer the best experience to those who visit them. If you’re into performant, accessible and SEO friendly sites, you might like it too! You can check it out at Optimize Toolset.

About

Hi, 👋, I’m Ryan Hefner  and I built this site for me, and you! The goal of this site was to provide an easy way for me to check the stats on my npm packages, both for prioritizing issues and updates, and to give me a little kick in the pants to keep up on stuff.

As I was building it, I realized that I was actually using the tool to build the tool, and figured I might as well put this out there and hopefully others will find it to be a fast and useful way to search and browse npm packages as I have.

If you’re interested in other things I’m working on, follow me on Twitter or check out the open source projects I’ve been publishing on GitHub.

I am also working on a Twitter bot for this site to tweet the most popular, newest, random packages from npm. Please follow that account now and it will start sending out packages soon–ish.

Open Software & Tools

This site wouldn’t be possible without the immense generosity and tireless efforts from the people who make contributions to the world and share their work via open source initiatives. Thank you 🙏

© 2024 – Pkg Stats / Ryan Hefner

rx-fsa

v1.0.6

Published

This TypeScript library provides factories for creating fully typed FSA-compliant Actions, reducers and RxJS utility operators.

Downloads

8

Readme

FSA Actions, Reducers, Matchers and RxJS Utils

This TypeScript library provides:

  • Factories for creating fully-typed FSA-compliant Actions.
  • Composable reducers and Action filters.
  • RxJS operators for easier async Effects set-up.
  • @ngrx/store lazy MemoizedSelector
export type Meta = Readonly<object> & { readonly [key: string]: any };

export interface Action<P, M extends Meta = Meta> {
  readonly type: string;
  readonly payload: P;
  readonly meta: M;
  readonly error: boolean;
}

Installation

npm i rx-fsa

/ngrx and /rxjs libs are compatible with Angular 6 and RxJS 6.

Usage

Basic Empty and Syncronous Actions

import { actionCreatorFactory } from "rx-fsa/actions";

const counterActionFactory = actionCreatorFactory("COUNTER");
const resetCounterFactory = counterActionFactory("RESET");
const resetActionAction = resetCounterFactory(undefined);

const incrementCounterFactory = counterActionFactory<number>("INCREMENT");
const incrementOneAction = incrementCounterFactory(1);

const decrementCounterFactory = counterActionFactory<number>("INCREMENT");
const decrementAction = (count: number) => decrementCounterFactory(count);

Async Action Creators

interface State {
  readonly count?: number;
}

const saveCountFactory = counterActionFactory.async<State, void, Error>("SAVE");
const saveCountStartedAction = saveCountFactory.started({ count: 100 });
const saveCountDoneAction = saveCountFactory.done({ result: 100, params: { count: 100 } });
const saveCountFailedAction = saveCountFactory.failed({ error: new Error("File not saved."), params: { count: 100 } });

Reducers

import { caseFn, Re, reducerDefaultFn } from "rx-fsa/reducers";

const INIT_STATE: State = { count: 0 };

const resetHandler: Re<State, void> = state => INIT_STATE;

const incrementHandler: Re<State, number> = (state, add) => ({
  count: state.count + add,
});

const decrementHandler: Re<State, number> = (state, sub) => ({
  count: state.count - sub,
});

export const reducers = reducerDefaultFn(INIT_STATE)(
  caseFn(incrementCounterFactory, incrementHandler),
  caseFn(decrementCounterFactory, decrementHandler),
  caseFn(resetCounterFactory, resetHandler),
);

RxJS Operators

The following operators are provided under rx-fsa/rxjs:

  • filterConcatAsync
  • filterExhaustAsync
  • filterMergeAsync
  • filterSwitchAsync
  • filterConcat
  • filterExhaust
  • filterMerge
  • filterSwitch
  • filterActions

Example with NgRx Effects:

import { filterExhaustAsync } from "rx-fsa/rxjs";

@Effect()
public saveCount$ = this.action$.pipe(
    filterExhaustAsync(saveCountFactory, params => this.httpSvc.save(params)),
);

The above is equivalent to:

@Effect()
public saveCount$ = this.action$.pipe(
  filter(saveCountFactory.started.match),
  mergeMap((result: R) => this.httpSvc.save(params).pipe(
    map(result = saveCountFactory.done({ result, params })),
    catchError(error => saveCountFactory.failed({ error, params }),
  ),
);

Lazy Selector

Create a MemoizedSelector that will emit a store slice or, if unavailable, dispatch action(s) to set the store slice and then emit.

// selectors.ts
import { createSelector } from "@ngrx/store";
import { composeLazySelector, createLazySelector } from "rx-fsa/ngrx";

const selectFeature = (state: AppState) => state.feature;
const selectFeatureCount = createSelector(selectFeature, state => state.counter);

export const lazySelectFeatureCount = createLazySelector(selectFeatureCount, loadFeatureAction.started(undefined));
export const lazySelectCountPlusN = composeLazySelector(lazySelectFeatureCount, lazySelectN)((count, n) => count + n);
// app.component.ts
import { lazySelectFeatureCount } from './selectors';

@Component({ ... })
class MyAppComponent {
  count: Observable<number>;

  constructor(private store$: Store<AppState>) {
    const selectFeatureCount = lazySelectFeatureCount(this.store$);
    this.count = this.store$.pipe(selectFeatureCount());
  }
}

API

API Documentation is coming soon. The library is small enough to scour through in GitHub to learn more.

Credits

This library was inspired by:

  • https://github.com/aikoven/typescript-fsa
  • https://github.com/dphilipson/typescript-fsa-reducers