Brian Vaughn bvaughn

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RFC Test Selectors

Owner: Brian Vaughn

As of facebook/react/pull/22760, the experimental Test Selector API is now available in the experimental release channel.

To test the API, first install the experimental release:

Intrested in contributing to React DevTools, but not sure where to start? This gist should hopefully get you going.

Install project dependencies

To get started, check out the React repo:

git clone [email protected]:facebook/react.git

Next install dependencies:

cd

Adding Server Component support to DevTools is going to be a big lift, but generally speaking there are a few initial things to work out:

Updating the Flight server renderer to stream server component names/types to the client.
Adding a new hook to DevTools for the Flight client to call.
Merging the server component subtrees into the DevTools client tree.

Yesterday and today I've been thinking about this last item, and I'm feeling pretty stumped at the moment. Merging the trees isn't that difficult, but preserving the tree across client updates gets nasty when it comes to things like conditionally rendered elements.

Setting performance concerns aside, even if I were to undo the merged trees, apply the client updates, and then redo the merge– I'm still not sure we would definitely end up with the correct final state.

For example, consider the following client component that accepts "children" rendered by a server component:

	#!/usr/bin/env node

	const { spawn } = require("child_process");
	const util = require("node:util");

	const exec = util.promisify(require("node:child_process").exec);

	async function main() {
	let { REPLAY_CHROME, RECORD_REPLAY_API_KEY } = process.env;
	if (!REPLAY_CHROME \|\| !RECORD_REPLAY_API_KEY) {

	const COLORS = {
	background: {
	bgBlack: {
	browser: [0, 0, 0],
	node: "\x1b[40m",
	},
	bgRed: {
	browser: [255, 0, 0],
	node: "\x1b[41m",
	},

	<!DOCTYPE html>
	<html>
	<body>
	<label>Rest for <input id="restCountInput" value="10" /></label>
	<label>Exercise for <input id="activityCountInput" value="30" /></label>
	<button id="startStopButton">Start</button>

	<p id="countLabel"></p>

	<script type="text/javascript">

	{
	"name": "React Conf 2021",
	"type": "dark",
	"semanticHighlighting": false,
	"colors": {
	"contrastBorder": "#122d42",
	"focusBorder": "#122d42",
	"foreground": "#d6deeb",
	"widget.shadow": "#011627",
	"selection.background": "#4373c2",

	<!DOCTYPE html>
	<html>
	<head></head>
	<body>
	<select id="cacheModeSelect">
	<option>default</option>
	<option>force-cache</option>
	</select>

	<script type="text/javascript">

	import { CustomConsole } from '@jest/console';

	function formatter(type, message) {
	switch(type) {
	case 'error':
	return "\x1b[31m" + message + "\x1b[0m";
	case 'warn':
	return "\x1b[33m" + message + "\x1b[0m";
	case 'log':
	default: