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function pubSubRegistry(){
    const subscriptions = [];
    
    return {
        publish: function publish(event) {
            subscriptions.forEach(function(subscription) {
                subscription(event);
            });
        },

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/*
A set of useful functional programming snippets
*/

/** pipe
 * @param fns Function[] - array of functions to execute
 *
 */
const pipe = (...fns: Function[]) => init => fns.reduce((acc, fn) => fn(acc), init);

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const reg = {
    foo: true,
    bar: false,
    qux: true,
    wc_123:true,
    new_feature:true
};

function dec2bin(dec){
    return (dec >>> 0).toString(2);

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// https://hackernoon.com/functional-javascript-functors-monads-and-promises-679ce2ab8abe
const Thing = value => ({
  value,
  map: morphism => Thing(morphism(value)),
  flatMap: morphism => morphism(value)
})

const thing1 = Thing(1)                          //=> Thing (1)
const thing2 = thing1.flatMap(x => Thing(x + 1)) //=> Thing (2)

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// Future versions of Hyper may add additional config options,
// which will not automatically be merged into this file.
// See https://hyper.is#cfg for all currently supported options.

module.exports = {
  config: {
    // Choose either "stable" for receiving highly polished,
    // or "canary" for less polished but more frequent updates
    updateChannel: 'stable',

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nvm ls-remote
nvm install 10.15.3
nvm alias LTS v10.15.3
nvm default LTS
nvm alias default 10.15.3
nvm use 10.15.3
npx npm -g install npm@latest
npm -v

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const { keys } = Object;

const isObject = a => typeof a === "object" && !Array.isArray(a);
const bothObjects = (a, b) => isObject(a) && isObject(b);
const neitherObjects = (a, b) => !isObject(a) && !isObject(b);
const sameType = (a, b) => (typeof a === typeof b);

const merge = (a, b) =>
        bothObjects(a, b)? 
            deepMerge(a, b): 

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import * as assert from 'assert';

const paths = [
    'src',
    'src/react-dom',
    'src/react-dom/src',
    'src/react-dom/src/client',
    'src/react-dom/src/client/ReactDOMHostConfig.js',
    'packages',
    'packages/react-dom',

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const Id = <T extends {}>(v: T) => {
    return {
        valueOf: () => v,
        map: (fn:any) => Id(fn(v))
    }
};

console.log(
    Id('foo')
        .map(

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const addFive = (v) => (v + 5);
const timesTen = (v) => (v * 10);
const toObj = (v) => ({value: v});
const addFiveTimesTenObj = (v) => [addFive, timesTen, toObj].reduce((acc, item) => (item(acc)), v);
console.log(addFiveTimesTenObj(123));
console.log(addFiveTimesTenObj(13));