Seven months ago:
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Project Manager: - "Guys, we need to make this brand new ProjectX, here are the specs. What do you think?"

Bored Old Lead: - "I was going to resign this week but you've convinced me, this is a challenge, I never worked with this stack, I'm staying! I'll gladly play with this framework I never used before, it seems to work with this libA I can use here and this libB that I can use here! Such fun!"

Project Manager: - "Awesome! I'm counting on you!"

Six months ago:
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Cprn: - "So this part you asked me to implement is tons of work due to the way you're using libA. I really don't think we need it here. We could use a more common approach."

Bored Old Lead: - "No, I already rewrote parts of libB to work with libA, we're keeping it. Just do what's needed."

Cprn: - "Really? Oh, I see. It solves this one issue I'm having at least. Did you push the changes upstream?"

Bored Old Lead: - "No, nobody uses it like that, people don't need it."

Cprn: - "Wait... What? Then why did you even *think* about using those two libs together? It makes no sense."

Bored Old Lead: - "Come on, it's a challenge! Read it! Understand it! It'll make you a better coder!"

Four months ago:
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Cprn: - "That version of the framework you used is loosing support next month. We really should update."

Bored Old Lead: - "Yeah, we can't. I changed some core framework mechanics and the patches won't work with the new version. I'd have to rewrite these."

Cprn: - "Please do?"

Bored Old Lead: - "Nah, it's a waste of time! We're not updating!"

Three months ago:
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Bored Old Lead: - "The code you committed doesn't pass the tests."

Cprn: - "I just run it on my working copy and everything passes."

Bored Old Lead: - "Doesn't work on mine."

Cprn: - "Let me take a look... Ah! Here you go! You've misused these two options in the framework config for your dev environment."

Bored Old Lead: - "No, I had to hack them like that to work with libB."

Cprn: - "But the new framework version already brings everything we need from libB. We could just update and drop it."

Bored Old Lead: - "No! Can't update, remember?"

Last Friday:
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Bored Old Lead: - "You need to rewrite these tests. They work really slow. Two hours to pass all."

Cprn: - "What..? How come? I just run them on revision from this morning and all passed in a minute."

Bored Old Lead: - "Pull the changes and try again. I changed few input dataset objects and then copied results from error messages to assertions to make the tests pass and now it takes two hours. I've narrowed it to those weird tests here."

Cprn: - "Yeah, all of those use ORM. Maybe it's something with the model?"

Bored Old Lead: - "No, all is fine with the model. I was just there rewriting the way framework maps data types to accommodate for my new type that's really just an enum but I made it into a special custom object that needs special custom handling in the ORM. I haven't noticed any issues."

Cprn: - "What!? This makes *zero* sense! You're rewriting vendor code and expect everything to just work!? You're using libs that aren't designed to work together in production code because you wanted a challenge!?? And when everything blows up you're blaming my test code that you're feeding with incorrect dataset!??? See you on Monday, I'm going home! *door slam*"

Today:
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Project Manager: - "Cprn, Bored Old Lead left on Friday. He said he can't work with you. You're responsible for Project X now."

Typescript is my new favorite and my grudge is the stupid scoping of type assertions. I have an async function that checks whether a variable is set and awaits a change event if it's undefined. This function is working javascript but invalid according to typescript, because it relies on the exact type changing while the function is running. I had to convert it to a mess of promises to bypass this because (and this is the best) the callback-based syntax of identical meaning will reset all type assertions, even locals that are never written after the callback's creation.