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Necrolas Scarlo 🧟‍♀️

@nicoespeon.com

890 followers 170 following 770 posts

🧹 I refactor Legacy Code and build tools to help you do the same! ✏️ understandlegacycode.com 🎩 Mr. Meetup Montréal • Software Crafters / React / TypeScript / Elixir 🍁 guild.host/montreal-tech/network

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Necrolas Scarlo 🧟‍♀️ @nicoespeon.com · 23d

Alright, let's make it official…

I am super-proud to tell you that I have finally published the print version of my book: "Legacy Code: First Aid Kit" 🎉 📕 🥲

A proud Nicolas holding a physical copy of his book. The book is 200 pages long. Its cover is mostly red and titled "Legacy Code: First Aid Kit" with some bandage, and a subtitle: "14 techniques to quickly and safely rescue a codebase"

The book is open at page 85. The chapter is titled "Decouple Core from Infrastructure". We can see some explanations along code snippets that have syntax coloring and a font size large enough to be comfortable to read.

The book is opened at page 35. The current chapter is titled "The Mikado Method & The Parking". On this page we can see there is an image to illustrate the concept being explained. It's readable enough to be comfortable. We can also see a footnote that links to Philippe Bourgau's blog because he was a relevant source for this concept.

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Necrolas Scarlo 🧟‍♀️ @nicoespeon.com · 9m

Burning house girl meme, with the girl asking "Is there a seahorse emoji" and ChatGPT burning in the background, desperately trying to come up with one

Necrolas Scarlo 🧟‍♀️ @nicoespeon.com · 15m

"Is there a seahorse emoji?"

🍿

chatgpt.com/share/68e939...

ChatGPT is convinced there is a seahorse emoji and starts melting down, trying to write it down.

It goes on and on, without ever managing to produce it, with desperate "FINAL FINAL FINAL REAL ANSWER" disclaimers 😄

Reposted by Necrolas Scarlo 🧟‍♀️

Adrien Joly @adrienjoly.com · 1d

I just shared with my team an example of how NVC (non-violent communication) help me resolve a conflict that made me mad against my CEO, in a previous work experience.
I figured that it may be helpful/interesting to some of you, so here we go:

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Reposted by Necrolas Scarlo 🧟‍♀️

Chris Morrell @cmorrell.com · 1d

If you're migrating data from an old system to a new one, and using a new table for the new data, set the auto-increment ID of the new table to be a round number that's higher than the highest ID in the old table. Some day you'll appreciate it.

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Reposted by Necrolas Scarlo 🧟‍♀️

Charles Desneuf @selrahcd.bsky.social · 2d

In a Zod schema, try using default instead of optional and see your code become clearer, free of undefined checks.

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Necrolas Scarlo 🧟‍♀️ @nicoespeon.com · 2d

💯

@jhumelsine.bsky.social 🙂

Necrolas Scarlo 🧟‍♀️ @nicoespeon.com · 2d

PSA if you didn't know: Jim has a nice list of great resources to help you deal with legacy code here 👇

jhumelsine.bsky.social @jhumelsine.bsky.social · 3d

Thanks for sharing. I've added it to the list of references in jhumelsine.github.io/2025/03/24/l...

Working Effectively with Legacy Code

… with all due respect to Michael Feathers in stealing his book title and a lot of his ideas for this blog

jhumelsine.github.io

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Necrolas Scarlo 🧟‍♀️ @nicoespeon.com · 3d

I've watched Steven Diamante's talk "The Legacy Code Survival Guide: Add Features Without Fear"

Although I'm familiar with the techniques, I've found they are very neatly presented!

The talk is 1h20 long, so I did a breakdown to help you watch it 😉

understandlegacycode.com/blog/legacy-...

The Legacy Code Survival Guide: Add Features Without Fear - Change Messy Software Without Breaking It

Steven Diamante gave a great presentation on Legacy Code at the Seattle Crafter meetup. Let's dive i

understandlegacycode.com

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Reposted by Necrolas Scarlo 🧟‍♀️

Montréal Tech Events @montreal-tech.guild.host · 11d

🥁 Oct 8th at 6PM: React MTL - Oct 2025

Connect with React & React Native geeks! Enjoy delicious food & refreshing drinks. 🍕🥤
Mohamed Hanou shows how Django simplifies life for React devs: fast APIs, auth, & back-office. 🚀

Check it out 👉 https://guild.host/e/o2g3yi

React MTL - Oct 2025

👥 Join us on Discord: discord.gg/kddEWbFhbc Our wonderful host: Triton digital ⭐ \--- Rejoins-nous pour apprendre et échanger avec des développeurs et développeuses React & React Native de Montréal! Comme d'habitude, il y aura de la bonne nourriture et des boissons rafraichissantes! Join us for an amazing fun evening and meet fellow Montrealer React & React Native geeks! As always, expect delicious food and refreshing drinks!

guild.host

Necrolas Scarlo 🧟‍♀️ @nicoespeon.com · 11d

📢 Dernier appel / Last call

Le CFP pour /dev/mtl ferme ses portes mercredi. Il ne vous reste qu'aujourd'hui et demain pour proposer des sujets 😉

www.papercall.io/dev-mtl-2025

PaperCall.io - /dev/mtl 2025

*English version below* 🇫🇷 Rejoins-nous le 28 Novembre 2025 pour une journée remplie de présentations des communautés tech locales! L'événement aura lieu à Montréal et proposera des présentations te...

www.papercall.io

Reposted by Necrolas Scarlo 🧟‍♀️

Emily Bache @emilybache.com · 21d

The team at the Modern Software Engineering Channel are helping me to publish a new free guide - this time for essential refactorings. There are a lot of fancy tools out there and keyboard shortcuts you could learn - and I find _these_ moves are foundational. www.subscribepage.com/mustlearncor...

Emily Bache’s Must Learn CORE Refactorings

www.subscribepage.com

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Necrolas Scarlo 🧟‍♀️ @nicoespeon.com · 22d

Thank you Simon 😃

Necrolas Scarlo 🧟‍♀️ @nicoespeon.com · 22d

Thank you Lars!

Necrolas Scarlo 🧟‍♀️ @nicoespeon.com · 23d

Thank you Shaun!

Necrolas Scarlo 🧟‍♀️ @nicoespeon.com · 23d

Il existe aussi une version Française (parce-que). Seulement en e-book, mais elle existe, ici: understandlegacycode.com/premiers-soi...

Legacy Code: Premiers Soins - Change Messy Software Without Breaking It

Secourez votre Legacy Code rapidement et sereinement.

understandlegacycode.com

Necrolas Scarlo 🧟‍♀️ @nicoespeon.com · 23d

If you are looking for more details, a free chapter, or the e-book version of this, you can check out understandlegacycode.com/first-aid-kit/

Legacy Code: First Aid Kit - Change Messy Software Without Breaking It

Rescue your Legacy codebase quickly and safely.

understandlegacycode.com

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Necrolas Scarlo 🧟‍♀️ @nicoespeon.com · 23d

Wherever you are in the world, you should be able to get one from your Amazon store 🗞️

This one is for all the geeks who:
🔹 are dealing with legacy codebases,
🔹 want practical techniques to tackle them,
🔹 and love having a physical book in their library 😄

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Necrolas Scarlo 🧟‍♀️ @nicoespeon.com · 23d

4 years after self-publishing the e-book, I found how to get a printed version without depending on an editor, nor deal with the worldwide delivery logistics…

Turned out that Amazon can handle it!

After a dozen more hours of work and rework, I'm finally happy with the result 🙂

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Necrolas Scarlo 🧟‍♀️ @nicoespeon.com · 23d

Alright, let's make it official…

I am super-proud to tell you that I have finally published the print version of my book: "Legacy Code: First Aid Kit" 🎉 📕 🥲

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Necrolas Scarlo 🧟‍♀️ @nicoespeon.com · 23d

All the best Josh, good luck!

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Necrolas Scarlo 🧟‍♀️ @nicoespeon.com · 24d

a man in a suit and tie has the word perfectenschlag written on his face

ALT: a man in a suit and tie has the word perfectenschlag written on his face

media.tenor.com

Reposted by Necrolas Scarlo 🧟‍♀️

James @43081j.com · Sep 9

some thoughts about the bloat introduced by edge-case first libraries

The bloat of edge-case first libraries

How building edge-case first led to bloated, overly-granular libraries and what we can do about it

43081j.com

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Necrolas Scarlo 🧟‍♀️ @nicoespeon.com · 27d

React Advanced (@reactadvanced.gitnation.org) is coming to Toronto in 2026! And I'll be speaking there 😉

🎙️ Call for Presentations is still OPEN!

Got an 🔥 idea for a talk or workshop?
Share it: shorturl.at/shnVJ

Learn more about the conference: shorturl.at/aI23h

Home of React and JavaScript insights directly from framework authors, early adopter engineers and big tech from - talk recordings, hands-on workshops and articles.

shorturl.at

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Reposted by Necrolas Scarlo 🧟‍♀️

React Advanced London @reactadvanced.gitnation.org · 28d

💚 Call for Volunteers – React Advanced Canada!

Join our amazing crew:
• Support sessions, registration, info desk & more
• Gain skills, make connections & create fun memories

Apply now!

Apply now!

google.com

forms.gle