Sign Up for Free

RunKit +

Try any Node.js package right in your browser

This is a playground to test code. It runs a full Node.js environment and already has all of npm’s 400,000 packages pre-installed, including augmentor with all npm packages installed. Try it out:

var augmentor = require("augmentor")

This service is provided by RunKit and is not affiliated with npm, Inc or the package authors.

augmentor v2.2.0

React like hooks for the masses

augmentor

Build Status Coverage Status Greenkeeper badge WebReflection status

Social Media Photo by Lucrezia Carnelos on Unsplash

React like hooks for the masses.

V2 Breaking change

Both useState and useReducer are now synchronous by default. If you invoke multiple state changes at once, you can opt into asynchronous execution via the optional argument {async: true}.

This change was made to keep augmentor defaults similar to what developers coming from other hooks based libraries expect.

Available Hooks

  • Basic Hooks
    • useState, with optional {async: true, always: true} second parameter to use deferred updates, sync by default, and always call the hook, even if the state is the same, false by default.
    • useEffect
    • useContext, which can be defined via createContext(value)
  • Additional Hooks
  • Third parts exported utilities
    • hasEffect(augmentedCallback) returns true if augmentedCallback used some effect
    • dropEffect(augmentedCallback) executes any cleanup left from last useEffect(...) invocation

example

You can test this example directly on Code Pen.

import {augmentor, useState} from 'augmentor';

// augment any function once
const a = augmentor(test);
a();

// ... or many times ...
const [b, c] = [test, test].map(augmentor);
b();
c();

function test() {

  const [count, setCount] = useState(0);

  // log current count value
  console.log(count);

  // will invoke this augmented function each second
  setTimeout(() => setCount(count + 1), 1000);
}

F.A.Q.

Can I pass a context to an augmented function?

While this library provides a way to use a context, it's somehow a footgun to enable multiple contexts for a single augmented stack, so by default you cannot use augmented.call(ctx) or augmented.apply(ctx, []), 'cause no context whatsoever is passed along.

If by any chance you've read, and understood, the related blog post, you'd realize a single augmented function is indeed not good for prototypes or shared methods, as one context could interfere with any other previous context that used that method before.

// WRONG: this is a very bad idea, as any MyComp instance
//        could potentially interfere with other instances
MyComp.prototype.doThings = augmentor(doThings);

// GOOD: this is how you'd do it 👍
class MyComp {
  constructor() {
    const {doThings} = this;
    // augment a bound method/function per each instance
    this.doThings = augmentor(doThings.bind(this));
  }
  doThings() {
    // where actually you do hooky-things
  }
}

That being said, if you really want to share a context within a single augmented function, meaning that you understand, and know, what you are doing, you can use the contextual utility provided by this library.

import {contextual} from 'augmentor';

const textInjector = contextual(function (text) {
  this.textContent = text;
});

textInjector.call(div, 'hello');
textInjector.call(p, 'there!');

Please bear in mind that contextualized functions effects will also refer to the previous context, not necessarily the current one, so that you see it's very easy to create troubles sharing, accepting, or passing, multiple contexts to the same augmented stack.

As summary, augmentor(method.bind(context)) is the best way to use a context within an augmented function, but contextual can help covering other weird edge cases too.

Metadata

RunKit is a free, in-browser JavaScript dev environment for prototyping Node.js code, with every npm package installed. Sign up to share your code.
Sign Up for Free