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Exploring NextJS with a custom CMS, pt3 – CodeWithSwiz

Friend, this episode of #CodeWithSwiz is a great example of why you want to start using TypeScript and how thermal load destroys computers.

CodeWithSwiz is a twice-a-week live show. Like a podcast with video and fun hacking. Focused on experiments. Join live Wednesdays and Sundays

Thermal load is fun for computers

First, the thermals 👉 it was a hot day in San Francisco and this city doesn't know about AC or insulation. Temperate climate with a few hot days, why bother.

Computers don't like that.

Your computer uses MOSFET transistors to perform computation. The details of how that works took my college physics professor a whole semester to explain and I'm not gonna try. The wikipedia article is great ✌️

Heat makes those transistors unreliable. 1 becomes 0, 0 becomes 1, and you get system crashes, hanged CPUs, or incorrect results without knowing they're incorrect.

This is why my Node app to thaw carrots with my laptop was a bad idea. Fun but bad 🥕

The faster your computer runs, the more heat it produces, the less reliable it becomes. That's why you don't have a 6GHz laptop. You'd need a cooler the size of your fridge. Or a dash of liquid nitrogen to run DOOM at 1000fps

Fun fact: Norway uses the heat output of data centers to heat entire towns through winter.

In lieu of a gigantic fridge, your laptop downclocks itself when it gets warm. Better to be reliable and slow than fast, unreliable, and broken.

And you can see that in my video above. Encoding got overwhelmed, frames started dropping, audio was good.

Why you should consider TypeScript

This entire episode was about fixing a bug.

NextJS shows a cryptic error
NextJS shows a cryptic error

You get a cryptic error from a library that you created. Your code builds without error. Try to use it and get a cryptic "X is not a constructor" message.

At first I thought this was a microbundle bug, then a parcel bug. You can see that flipflop in the previous episode of CodeWithSwiz.

Removed images from source, changed to text, and went back to microbundle. Didn't help.

After the stream I tried one last debugging trick 👉 look at the compiled source. Open dist/index.js in VSCode, run prettier, see if anything stands out.

Prettifying compiled source to spot bugs

Okay l is the @octokit/rest library. How am I using that? 🤔

import Octokit from "@octokit/rest";

That looks fine ... what does the readme say?

const { Octokit } = require("@octokit/rest");

It's a named export, not a default export. 🤦‍♂️

Change that line of code and the error goes away.

import { Octokit } from "@octokit/rest";

An hour wasted because JavaScript can't know you're using a library, function, or variable incorrectly until you run the code. TypeScript would yell at us and we'd fix the bug in 3 minutes.

Lesson learned my friend. We continue on Sunday

Cheers,
~Swizec

PS: we also ran into a microbundle compilation bug that means you have to add import 'regenerator-runtime/runtime' to your code. Don't worry about it, there's a PR ✌️

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Published on September 8th, 2020 in CodeWithSwiz, Livecoding, Technical

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