RenderATL Notes

Published Wednesday, June 01, 2022

June 1-4, 2022

📆 Day 1

Cecelia Martinez, “Debugging React Applications! Presented By Replay”

Cecelia Martinez

  • Did bootcamp in Atlanta (Georgia Tech)
  • Used to be at Cypress
  • Now at
  • GitHub Star
  • @ceceliacreates


Common approach: “debugging dartboard”

  • Classics: console.log, debuggers, etc.
  • Applied at random, not systematically

Process + tools => better experience


3 step process:

  1. What is the problem?
    • Reproduce bug
    • Understand expected behavior (“what does working look like?”)
    • Define problem
  2. Why is it broken?
    • Multiple hypotheses: the more hypothesis, the better
    • Collaborate early (phone a friend)
    • Isolate the problem
  3. How did it happen?
    • Ask yourself: could a test have caught this?
    • Are you using the framework correctly?
    • Other areas of the codebase with same implementation? (i.e. is it working/broken elsewhere?)

Find a process that works for you.


How you execute your process

Two categories:

  • Inspecting
    • Browser/IDE
    • Elements
    • State
  • Evaluating
    • Control flow
    • Execution
    • Performance

Activity: (by @bdougie 🎉)

  • Source maps shipped to the browser (non-minified original source code)
  • Built with React
  • React DevTools also has a performance profiler demo

  • Replay is a browser, fork of Firefox
  • Nextjs app (frontend)
  • Replay protocol (backend) (examples)
  • Record session or automated tests
  • Code heat maps
  • Drop in replacement for automated tests
  • Practice with Replay:


“The best debugging tool is knowing something well” - Jenn Creighton (@gurlcode), “Debugging async JS”


  • Reinforce process
  • Recognize patterns


  • Component (re)rendering
    • Rendering before data is there
    • Check useEffects
  • State and hooks
    • Competing sources of truth (local vs global data store)
    • Race conditions (event loop shenanigans)

Pro tip: use beta React docs

Random observations

  • “TipTapEditor” –> great component name
  • Comments in side panel, not inline. Both narrating recording and code review

Dwane Hemmings, “Web Components Are Awesome! Presented By Vonage”

Sponsored by Vonage

ft. live transcription (!!)

lol @

Slides (pw: outkast)


What are they?

  • Custom elements
    • kebab case, no single words
    • class object
    • extends, if any
  • Shadow DOM
    • encapsulation
    • “contain the gross” - Paul Lewis
    • remaps events (i.e. custom events)
  • HTML templates
    • <template>
  • Can be styled with CSS, same as anything else.
    • Helpful to leverage CSS variables
    • ::part pseudoclass


Built-in functions:

  • connectedCallback - fires when added to DOM
  • attributeChangedCallback - fires when observed attribute(s) change
  • disconnectedCallback - fires when removed from DOM
  • operate on Shadow DOM, not document

More examples:

    • Play around with components in the browser
    • Push to GitHub/Lab optionally
    • Lots of starter templates
    • Best practices
    • CLI tool that allows you to scaffold WCs


<vc-keypad> WC

WC + React

  • React doesn’t play super nice with WCs (explainer)
  • –> “caniuse” for WCs
  • Experimental branch has full support (!!)

Example with React

📆 Day 2

Bria Sullivan, “Making Fun: Building Your First Mobile Game On The Side”

  • Goal: launch in 3 months
  • Used Firebase analytics
  • Advice: don’t do it all yourself, know your expertise (ex. use fivvr for design assets)

Angie Jones, “Refactoring the Web”

  • Web was meant to be decentralized
    • No central authority originally
    • No identity layer (oops)
  • Currently
    • Auth via fb, google, so no agency
    • You do not own your own data
  • Future: what if identity was native?
    • Self owned ids
    • Based on Open standards
  • Proposal
    • New layer for the web
    • 1) DIDs : decentralized identifiers
      • Identity stored on the blockchain
      • Specifically, only DID string stored on blockchain
    • 2) Verifiable credentials
    • 3) Decentralized web nodes
      • Personal data stores
      • Decouple data from apps we use
      • Nodes are not on the blockchain, stored locally
      • Similar to progressive web apps (PWAs)

Scott Hanselman, “Beyond Mentorship - Storytelling And Sponsorship”

  • Do you have 20 yrs experience, or the same year, 20 times? (i.e. are you learning? or “asleep”?)
  • Privilege doesn’t run out. You can give it away without losing any
  • Sponsors create luck (where luck === opportunity + being prepared)
  • Advice: don’t answer emails/DMs. Write it somewhere public and shareable, then share that link with the person(s) who inspired it. That way you reach more people.

Brian Douglas, “Where To Start With Open Source”

  • “it’s not about who you know, it’s about who knows you.” (tweet)
  • Great way to contribute: triage issues
    • Add steps to reproduce
    • Confirm whether you can reproduce
    • Learn what makes a “good” error report / feature request
  • Contributions are more than just “green squares”
  • Look for projects you’re interested in
    • Help them check off the essentials (contributing guidelines, docs, “hello world” tutorials)
    • Clear PR descriptions, should always link to associated issue
    • Help maintainers get to know and trust you
      • Don’t disappear
      • Be reachable, responsive

Pariss Athena, “Beauty Meets Web3”

  • Examples
    • Olay: simulator that ages you 20 years (then suggests products)
    • Opte printed makeup
    • E-makeup, aka filters
    • Valde beauty NFTs
    • MetaOptimist NFT contest by Clinique

Danny Thompson, “Error Boundaries Save You From Crashes! Here’s How To Use It!”

  • Official docs
  • Create trust through better customer facing error messages
  • Error boundary components catch error anywhere in child tree and handle it gracefully
  • Wrap individually (one option)
  • Does not catch a whole bunch of kinds of errors. Not a catch all

Kent C. Dodds, “Bringing Back Progressive Enhancement”

  • Remix is built as a browser emulator
  • Works with JS disabled
  • Progressive enhancement is not new, coined in 2003
  • You don’t need Relay or Apollo when using Remix
  • Replace your state management code with Remix
  • Form submissions are navigation