Kent C. Dodds kentcdodds

## kent-newsletters.json
[
  {
    "link": "https://blog.kentcdodds.com/migrating-to-jest-881f75366e7e",
    "title": "Migrating to Jest",
    "comment": "Kent C. Dodds is super excited about Jest as an alternative to AVA and Mocha, and explains how he was won over after not initially being a fan.",
    "newsletter": {
      "name": "JavaScript Weekly",
      "issue": 310,
      "link": "http://javascriptweekly.com/issues/310"
    }

## 0 basics.md

      
              1 file
            
          
              7 forks
            
          
              15 comments
            
          
              129 stars
            
          
                threepointone
                / 0 basics.md
            
            
              Last active
              March 21, 2023 01:53
            
              
                css-in-js
              
          
    A series of posts on css-in-js

0. styles as objects

First, an exercise. Can we represent all of css with plain data? Let's try.
let redText = { color: 'red' };

  
## 1.js
function logger(strings,...values) {
   var str = "";
   for (let i = 0; i < strings.length; i++) {
      if (i > 0) {
         if (values[i-1] && typeof values[i-1] == "object") {
            if (values[i-1] instanceof Error) {
               if (values[i-1].stack) {
                  str += values[i-1].stack;
                  continue;
               }

## README.md

      
              3 files
            
          
              2 forks
            
          
              1 comment
            
          
              5 stars
            
          
                elijahmanor
                / README.md
            
            
              Last active
              November 8, 2018 19:34
            
              
                Has Deprecated Packages
              
          
    Feel free to run via...
npx https://gist.github.com/elijahmanor/4cc8e3eac9fb5999c5d759388ff27c64

  
## index.md

      
              1 file
            
          
              13 forks
            
          
              38 comments
            
          
              315 stars
            
          
                bvaughn
                / index.md
            
            
              Last active
              April 3, 2024 07:41
            
              
                Interaction tracing with React
              
          
    This API was removed in React 17


Interaction tracing with React

React recently introduced an experimental profiler API. After discussing this API with several teams at Facebook, one common piece of feedback was that the performance information would be more useful if it could be associated with the events that caused the application to render (e.g. button click, XHR response). Tracing these events (or "interactions") would enable more powerful tooling to be built around the timing information, capable of answering questions like "What caused this really slow commit?" or "How long does it typically take for this interaction to update the DOM?".
With version 16.4.3, React added experimental support for this tracing by way of a new NPM package, scheduler. However the public API for this package is not yet finalized and will likely change with upcoming minor releases, so it should be used with caution.

  
## raw-text-example.js
/**
 * In our app, we have a few middleware that generate a string of HTML.
 * On occassion it's fine to just use dangerouslySetInnerHTML directly for
 * those, but that requires that you have a host node for the innerHTML.
 *
 * In certain scenarios (like tags in <head />), there's HTML that we need
 * to insert directly where it is. This component enables that because
 * we replace <raw-text> and </raw-text> with empty strings. Effectively
 * making whatever's between <raw-text> and </raw-text> inlined in place.
 *

## App.js
import React from "react";
import useMutableReducer from "./useMutableReducer";

const reducer = (draft, action, state) => {
  switch (action) {
    case "increment":
      draft.count++;
      break;
    case "decrement":
      draft.count--;

## control-props.js
// control props

import React from 'react'
import _ from 'lodash'
import {Switch} from '../switch'

const callAll = (...fns) => (...args) => fns.forEach(fn => fn && fn(...args))
const noop = () => {}

function toggleReducer(state, {type, initialState}) {

## create-reducer-context.js
// src/count-context.js
import React from 'react'

function countReducer(count, action) {
  const {step = 1} = action
  switch (action.type) {
    case 'INCREMENT': {
      return count + step
    }
    default: {

## usePromise.js
import { useState, useEffect, useCallback } from 'react'

function usePromise(createPromise) {
  const [error, setError] = useState()
  const [value, setValue] = useState()

  useEffect(() => {
    let current = true

    createPromise().then(
	[
	{
	"link": "https://blog.kentcdodds.com/migrating-to-jest-881f75366e7e",
	"title": "Migrating to Jest",
	"comment": "Kent C. Dodds is super excited about Jest as an alternative to AVA and Mocha, and explains how he was won over after not initially being a fan.",
	"newsletter": {
	"name": "JavaScript Weekly",
	"issue": 310,
	"link": "http://javascriptweekly.com/issues/310"
	}
	function logger(strings,...values) {
	var str = "";
	for (let i = 0; i < strings.length; i++) {
	if (i > 0) {
	if (values[i-1] && typeof values[i-1] == "object") {
	if (values[i-1] instanceof Error) {
	if (values[i-1].stack) {
	str += values[i-1].stack;
	continue;
	}
	/**
	* In our app, we have a few middleware that generate a string of HTML.
	* On occassion it's fine to just use dangerouslySetInnerHTML directly for
	* those, but that requires that you have a host node for the innerHTML.
	*
	* In certain scenarios (like tags in <head />), there's HTML that we need
	* to insert directly where it is. This component enables that because
	* we replace <raw-text> and </raw-text> with empty strings. Effectively
	* making whatever's between <raw-text> and </raw-text> inlined in place.
	*
	import React from "react";
	import useMutableReducer from "./useMutableReducer";

	const reducer = (draft, action, state) => {
	switch (action) {
	case "increment":
	draft.count++;
	break;
	case "decrement":
	draft.count--;
	// control props

	import React from 'react'
	import _ from 'lodash'
	import {Switch} from '../switch'

	const callAll = (...fns) => (...args) => fns.forEach(fn => fn && fn(...args))
	const noop = () => {}

	function toggleReducer(state, {type, initialState}) {
	import { useState, useEffect, useCallback } from 'react'

	function usePromise(createPromise) {
	const [error, setError] = useState()
	const [value, setValue] = useState()

	useEffect(() => {
	let current = true

	createPromise().then(