A public reference for Mackie Underdown’s writing, notes, and guides.https://mackie.underdown.wiki/https://mackie.underdown.wiki/posts/im-so-tired/https://mackie.underdown.wiki/posts/im-so-tired/I have a two-year-old son who gets up between 5-6am every day, but that’s not why I’m tired. It’s AI.Wed, 31 Dec 2025 00:00:00 GMThttps://mackie.underdown.wiki/posts/deno-opentelemetry-quick-start/https://mackie.underdown.wiki/posts/deno-opentelemetry-quick-start/Send Deno's built-in OpenTelemetry logs and traces to a local Grafana stack.Sat, 14 Jun 2025 00:00:00 GMThttps://mackie.underdown.wiki/posts/using-tailwind-v4-with-storybook-v8/https://mackie.underdown.wiki/posts/using-tailwind-v4-with-storybook-v8/Tailwind v4 and Storybook 8.4, wired up with Vite.Tue, 14 Jan 2025 00:00:00 GMThttps://mackie.underdown.wiki/posts/sst-cloudflare-worker-hono/https://mackie.underdown.wiki/posts/sst-cloudflare-worker-hono/Deploy a Hono API to Cloudflare Workers with SST.Wed, 09 Oct 2024 00:00:00 GMThttps://mackie.underdown.wiki/posts/luxon-month-view-calendar-helper/https://mackie.underdown.wiki/posts/luxon-month-view-calendar-helper/Build a month calendar with Luxon's startOf and endOf helpers.Mon, 10 Jul 2023 00:00:00 GMThttps://mackie.underdown.wiki/posts/using-zod-with-remix/https://mackie.underdown.wiki/posts/using-zod-with-remix/What I’ve learned using Zod to validate Remix forms and requests.Thu, 04 May 2023 00:00:00 GMThttps://mackie.underdown.wiki/posts/prefer-explicit-enumerated-states/https://mackie.underdown.wiki/posts/prefer-explicit-enumerated-states/A few useState hooks are fine until they make invalid UI states easy to represent.Tue, 21 Feb 2023 00:00:00 GMThttps://mackie.underdown.wiki/posts/rails-month-view-calendar-helpers/https://mackie.underdown.wiki/posts/rails-month-view-calendar-helpers/Build a month calendar with Rails date helpers.Thu, 13 Oct 2022 00:00:00 GMThttps://mackie.underdown.wiki/posts/the-power-of-no-restricted-syntax/https://mackie.underdown.wiki/posts/the-power-of-no-restricted-syntax/Use ESLint selectors to block AST patterns your team has decided against.Mon, 18 Mar 2019 00:00:00 GMThttps://mackie.underdown.wiki/posts/npm-pack-dry-run/https://mackie.underdown.wiki/posts/npm-pack-dry-run/See exactly what npm will include when you publish a package.Sat, 20 May 2017 00:00:00 GMT