Migrating a Legacy JavaScript Codebase to TypeScript - JSJ 680

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Squid Game: The Official Podcast

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Keys and Knives - S3 Ep 1 26:28

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Squid Game is back—and this time, the knives are out. In the thrilling Season 3 premiere, Player 456 is spiraling and a brutal round of hide-and-seek forces players to kill or be killed. Hosts Phil Yu and Kiera Please break down Gi-hun’s descent into vengeance, Guard 011’s daring betrayal of the Game, and the shocking moment players are forced to choose between murdering their friends… or dying. Then, Carlos Juico and Gavin Ruta from the Jumpers Jump podcast join us to unpack their wild theories for the season. Plus, Phil and Kiera face off in a high-stakes round of “Hot Sweet Potato.” SPOILER ALERT! Make sure you watch Squid Game Season 3 Episode 1 before listening on. Play one last time. IG - @SquidGameNetflix X (f.k.a. Twitter) - @SquidGame Check out more from Phil Yu @angryasianman , Kiera Please @kieraplease and the Jumpers Jump podcast Listen to more from Netflix Podcasts . Squid Game: The Official Podcast is produced by Netflix and The Mash-Up Americans.…

حدود یک سال پیش 1:25:42

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In this episode, Dan and I (Steve) dove deep into what turned out to be a surprisingly complex, yet incredibly insightful topic: gradually migrating a massive legacy JavaScript project over to TypeScript. We're talking about nearly 1,000 JS files, 70,000+ lines of code, and years of developer history—all transitioning carefully to a typed, modern future.
Dan walked us through how he started by setting up the project for success before converting even one file—getting CI/CD ready, setting up tsconfig.json, sorting out test dependencies, dealing with mock leaks, and even grappling with quirks between VS Code and WebStorm debugging.
We talked tools (like TS-ESLint, concurrently, and ts-node), why strict typing actually uncovered real bugs (and made the code better!), and why it’s crucial not to touch any .js files until your TypeScript setup is rock solid.
Key Takeaways:

Gradual migration is 100% possible—and often better—than ripping the bandaid off.
TypeScript can and will catch bugs hiding in your JavaScript. Be prepared!
Use VS Code extensions or TS-Node to support your devs’ tooling preferences.
Don't underestimate the setup phase—it’s the foundation of long-term success.
Start small: Dan's team converted just one file at first to test the whole pipeline.

If you’re sitting on a legacy JS project and dreaming of TypeScript, this episode is your blueprint—and your warning sign.
Become a supporter of this podcast: https://www.spreaker.com/podcast/javascript-jabber--6102064/support.

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