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Marvin Hagemeister

@marvinh.dev

2.5K followers 176 following 334 posts

I build simple and fast things. Part of Preact team.

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Marvin Hagemeister @marvinh.dev · 19/03/2026

Playing around with some compiler guided optimizations in Preact

Benchmark Hooks Blocks Diff
─────────────────────────────────────────────────
create 1k rows 41.6ms 37.7ms -9.4%
replace 1k rows 50.7ms 43.2ms -14.8%
update every 10th 33.3ms 22.1ms -33.6%
select row 19.7ms 8.5ms -56.9%
swap rows 37.1ms 25.2ms -32.1%
remove row 22.9ms 18.2ms -20.5%
create 10k rows 438.2ms 384.6ms -12.2%
append 1k rows 51.5ms 43.9ms -14.8%
clear 1k rows 19.3ms 17.9ms -7.3%

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Marvin Hagemeister @marvinh.dev · 24/09/2025

Making chains of middlewares type-safe seems to require a bit of dancing around with types. See github.com/microsoft/Ty...

Type for a middleware function that uses a list of 10 generic arguments to make it possible to chain a type through middleware functions because TS lacks native functionality to do so.

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Marvin Hagemeister @marvinh.dev · 10/08/2025

Good idea, didn't check that. It looks like @std/semver is faster for validation, but way slower for calling `satisifes`. First image is validate + satisfies, second is satisfies only

node-semver: 75.3ms
jsr:@std/semver: 70ms
custom: 3.9ms

node-semver: 23.6ms
jsr:@std/semver: 41.9ms
custom: 2.8ms

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Marvin Hagemeister @marvinh.dev · 06/08/2025

TIL: `path.relative()` can return absolute paths on windows. This is beyond cursed.

$> path.relative("C:\\foo", "D:\\bar") 'D:\\bar' > path.join("foo", "D:\\bar") '.\\foo\\D:\\bar' > path.resolve("foo", "D:\\bar") 'D:\\bar' > path.normalize("foo", "D:\\bar") 'foo'$

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Marvin Hagemeister @marvinh.dev · 10/01/2025

Well looks like I lied! (All of that is coming from snapshot tests though)

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Marvin Hagemeister @marvinh.dev · 09/01/2025

Let's start the year strong! Dropping this banger of a PR on my work colleagues tomorrow. It's way too big, but it's worth it. More will be revealed soon!

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