Jānis Smilga 🇱🇻 🇺🇦 #StandWithUkraine

Web Developer • 🚀 Creator of • Tweets about my dev journey

[Jānis Smilga 🇱🇻 🇺🇦 #StandWithUkraine @codingaddict_lv]

@TheNkennaAmadi @webflow Congratulations !!!

[Jānis Smilga 🇱🇻 🇺🇦 #StandWithUkraine @codingaddict_lv]

@thelifg_ https://t.co/gc4T2goezA

[Jānis Smilga 🇱🇻 🇺🇦 #StandWithUkraine @codingaddict_lv]

🚀 New Course Launch!

AWS CDK v2 with TypeScript

Learn to define & deploy AWS infrastructure in code.
Hands-on projects: S3, Lambda, API Gateway, DynamoDB, SQS, Cognito & more.

Enroll now & build like a pro!

https://t.co/6kSL5ZwCgm
#AWS #CDK #TypeScript #CloudComputing

[Jānis Smilga 🇱🇻 🇺🇦 #StandWithUkraine @codingaddict_lv]

🚨 New Course Alert! 🚨
Practical Git and GitHub: From Basics to Pro Workflows
✅ Real-world Git commands
✅ VSCode + Terminal workflows
✅ Interactive rebase, cherry-pick & more

🎯 https://t.co/tT2Nw4tzWP

🎟 Code: GIT-GITHUB-COURSE
⏳ Offer ends June 11, 2025

[Jānis Smilga 🇱🇻 🇺🇦 #StandWithUkraine @codingaddict_lv]

🚨 New Course Alert! 🚨
Practical Git and GitHub: From Basics to Pro Workflows
✅ Hands-on Git commands
✅ Real-world workflows (merge, rebase, cherry-pick)
✅ Terminal + VSCode examples

Perfect for devs who want to master Git without the fluff.

[Jānis Smilga 🇱🇻 🇺🇦 #StandWithUkraine @codingaddict_lv]

The limits of AI in programming | Tim Sweeney and Lex Fridman https://t.co/S9WlosAzCO via @YouTube

[Jānis Smilga 🇱🇻 🇺🇦 #StandWithUkraine @codingaddict_lv]

The more time I spend in production code, the more I realize how out of touch many YouTube coding influencers are.
Their takes on “clean code,” “best practices,” and what it means to be a senior dev often crumble in the face of real-world constraints, and legacy systems 😂

[Jānis Smilga 🇱🇻 🇺🇦 #StandWithUkraine @codingaddict_lv]

🚀 New Course Alert!

Master Jest Testing with TypeScript & Node.js
Learn how to write clean, reliable tests with real-world examples.

Unit tests, mocks, spies, error handling & more!

🎯 Enroll now →
https://t.co/qkkIDH0HPD

[Jānis Smilga 🇱🇻 🇺🇦 #StandWithUkraine @codingaddict_lv]

Just installed webpack-bundle-analyzer — love the 🔥 graphical breakdown of my bundle! Makes spotting bloat so much easier 📊🕵️‍♂️
Not using Webpack? Check out source-map-explorer or vite-plugin-visualizer 💡
#webpack #webperf #javascript

[Jānis Smilga 🇱🇻 🇺🇦 #StandWithUkraine @codingaddict_lv]

Spicy take 🌶️: For all the talk about TypeScript "overcomplicating" things, it’s actually saving your team from chaos 😅

[Jānis Smilga 🇱🇻 🇺🇦 #StandWithUkraine @codingaddict_lv]

🔍 Want to see where a dependency is used in your project?
Run this command:
👉 npm ls package-name
It shows the full dependency tree 🌳
Super useful for tracking down nested dependencies 🕵️‍♂️
#npm #javascript #nodejs #webdev

[Jānis Smilga 🇱🇻 🇺🇦 #StandWithUkraine @codingaddict_lv]

Hot take 🔥 : in production, SourceTree ⏩ Git CLI.
Look, I ❤️ terminal too, but when it’s time to rebase, merge, and cherry-pick in prod - most times clicking 🖱️ is faster than rewriting the same conflict 3 times—or summoning the Git gods with a ritual sacrifice. 🔥

[Jānis Smilga 🇱🇻 🇺🇦 #StandWithUkraine @codingaddict_lv]

Using a this hack in tests:
🔁 const resetSingleton = () => (HashingService as any).instance = undefined;
🔧 Calling this in beforeEach() to reset singleton state.
🕵️‍♂️ In general, (SomeClass as any) helps "cheat" TypeScript when tests need to bypass strict typing. #TypeScript#Jest

[Jānis Smilga 🇱🇻 🇺🇦 #StandWithUkraine @codingaddict_lv]

Spent an hour debugging a mysterious TypeScript error 😵‍💫
Turns out... .webpackCache was the culprit 🧨
Deleted it, and everything worked like magic ✨
#webpack #devlife #typescript 🛠️

[Jānis Smilga 🇱🇻 🇺🇦 #StandWithUkraine @codingaddict_lv]

@skyybbanerjee Send me a DM and I will generate one for you

[Jānis Smilga 🇱🇻 🇺🇦 #StandWithUkraine @codingaddict_lv]

🧠 TypeScript fun fact! 🧠

The declare keyword only provides type information but NO runtime values!

declare enum Colors { RED, BLUE }
console.log(https://t.co/onFaKBNq8d) // 💥 Crash!

Remove declare if you need actual values at runtime 😀

[Jānis Smilga 🇱🇻 🇺🇦 #StandWithUkraine @codingaddict_lv]

@skyybbanerjee Oh, I forgot to send it this month :(

[Jānis Smilga 🇱🇻 🇺🇦 #StandWithUkraine @codingaddict_lv]

🔍 Dev Tip: Lookup Tables FTW! 📚

Ditch long if/switch statements—use object mapping instead!

🚀 Examples:
✅ Convert status codes to messages
✅ Map country codes to names
✅ Translate enums
💡 const result = lookupTable[input] || defaultValue;
Fast, and easy to maintain! ⚡

[Jānis Smilga 🇱🇻 🇺🇦 #StandWithUkraine @codingaddict_lv]

🚀 Generate minimal .d.ts files with dts-bundle-generator

📦 npm install --save-dev dts-bundle-generator
📂 mkdir -p types (if missing)
⚡ npx dts-bundle-generator -o types/utils.d.ts src/utils.ts
🔍 Extracts only needed types & dependencies!

[Jānis Smilga 🇱🇻 🇺🇦 #StandWithUkraine @codingaddict_lv]

🧪 Jest Mocking Gotcha!

🔥 Issue:
👉 jest.mock('./myModule');
🚨 Returns undefined for EVERYTHING! 🫥

⚡ Your code:
👉 myModule.doStuff()
💥 Cannot read property 'doStuff' of undefined

🛠 Fix:
jest.mock('./myModule', () => ({ doStuff: jest.fn() }));

#JavaScript #Testing #Jest