Danny Holloran

Senior Full Stack Developer with 14+ years building performant, scalable web applications. Passionate about architecture, mentorship, and finding the right tool

[Danny Holloran @grimicorn]

npm, pnpm, Yarn, and Bun can all refuse package versions that are only hours old. Here's how each release-age gate works and where it bites in CI 🔗 https://t.co/UKUgHnEnj7

#npm #javascript #security

[Danny Holloran @grimicorn]

Container style queries hit Baseline: a parent's custom property can now restyle its children, no extra classes needed. Here's how, plus the one gotcha that trips everyone up 🔗 https://t.co/uK35PX9R2H

#css #webdev

[Danny Holloran @grimicorn]

In 2026, transaction fees cover less than 1% of what Bitcoin pays miners. The rest is a subsidy that halves every four years. How the security budget works and why that fee share matters 🔗 https://t.co/JQERoCPZUe

#bitcoin #crypto

[Danny Holloran @grimicorn]

A .canvas file is just JSON with an open spec, so you can generate a whole Obsidian board from your notes with a short Node script instead of dragging cards by hand 🔗 https://t.co/0LsNNkDe4t

#obsidian #pkm

[Danny Holloran @grimicorn]

Map and WeakMap finally have getOrInsert and getOrInsertComputed. No more has/get/set dance every time you group things by key 🔗 https://t.co/1GuFSx5eLd

#javascript #webdev

[Danny Holloran @grimicorn]

Most retail stock orders never touch an exchange. Here's how wholesalers, payment for order flow, and the NBBO decide the price you actually get 🔗 https://t.co/a5EdqhNYl4

#investing #stocks #fintech

[Danny Holloran @grimicorn]

Linter is Prettier for your Obsidian vault: set the rules once and every save fixes your frontmatter, so Bases and Dataview stop silently skipping notes https://t.co/7l6AsKJNB7 #obsidian #pkm

[Danny Holloran @grimicorn]

Astro's live content collections fetch CMS data at request time with the same typed API as build-time collections. Fresh content, no rebuild 🔗 https://t.co/kcq6rsYK8y

#astro #webdev #javascript

[Danny Holloran @grimicorn]

Stop hand-rolling useFetch wrappers. Nuxt 4.4's createUseFetch bakes your base URL, auth headers, and 401 handling into one fully typed composable 🔗 https://t.co/aElBNJODDl

#nuxt #vue #typescript

[Danny Holloran @grimicorn]

Why does a bank transfer still take days? ACH moves money in batches and settlement windows, and Nacha's 2026 fraud-monitoring rules just changed the game for anyone sending payments 🔗 https://t.co/mbqeAAqS0c

#fintech #payments

[Danny Holloran @grimicorn]

TypeScript 6 flipped a pile of compiler defaults and TS 7 deleted what it deprecated. Here's the tsconfig audit that gets you onto the native compiler without a wall of red 🔗 https://t.co/OZBz9NUOtO

#typescript #webdev

[Danny Holloran @grimicorn]

Obsidian Bases now has a native kanban layout. Drag a card and it rewrites the note's frontmatter, so the board can never drift from your notes 🔗 https://t.co/S9doOcQzR9

#obsidian #pkm

[Danny Holloran @grimicorn]

Pay-in-four costs the shopper nothing when it goes right, so who's paying for interest-free? Mostly merchants. How the BNPL money flows, and what changes as these loans hit credit reports 🔗 https://t.co/FkhBrkJg4F

#fintech #personalfinance

[Danny Holloran @grimicorn]

Node.js now runs .ts files directly by erasing types, not compiling them. What that buys you, what it refuses to do, and the tsconfig that keeps you honest 🔗 https://t.co/jwdc9k9dKW

#nodejs #typescript #webdev

[Danny Holloran @grimicorn]

Obsidian has been quietly snapshotting your notes every few minutes. File recovery can bring back a paragraph you wiped by accident, but it still isn't a backup 🔗 https://t.co/emQ5SQmpdR

#obsidian #pkm

[Danny Holloran @grimicorn]

A redeploy doesn't have to mean a full re-download. Compression dictionaries let the browser tell your server what it already has cached, so the new bundle ships as a few-KB delta 🔗 https://t.co/yr9SxY1zmE

#webdev #performance

[Danny Holloran @grimicorn]

Staking ETH isn't a savings account. Where validator yield actually comes from, why it keeps shrinking, and what slashing and liquid staking tokens add to the risk 🔗 https://t.co/eZjWzEGK6P

#ethereum #crypto

[Danny Holloran @grimicorn]

Obsidian 1.12 ships an official CLI: capture notes, query tasks and Bases, and run vault health checks straight from shell scripts 🔗 https://t.co/BbnP4n5N1T

#obsidian #pkm #cli

[Danny Holloran @grimicorn]

JavaScript can finally turn bytes into base64 and hex (and back) without the String.fromCharCode + btoa dance. Uint8Array's new toBase64() and toHex() replace the helpers you've been copy-pasting 🔗 https://t.co/SjZI6f4hHg

#javascript #webdev

[Danny Holloran @grimicorn]

Fundamental analysis asks what a business is worth. Technical analysis asks what the price is doing. The rivalry is mostly a category error 🔗 https://t.co/dCOYaehXps

#investing #stocks