Development journal

Posts tagged: JavaScript

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VS Code and AI tooling

How to build a VS Code extension: I read the OpenCode one and wrote my own

10 min read

Written by: Jonathan Reis on Jul 24, 2026

A practical tutorial on how to build a VS Code extension from scratch. I read the minified source of the official OpenCode extension, found the internal HTTP endpoint, and built one that sends any selection — including from unsaved files.

VS Code OpenCode VS Code extensions AI tooling JavaScript Cursor

Astro and Cloudflare Pages

Blog dates off by one day: the timezone bug that affects every Astro site

6 min read

Written by: Jonathan Reis on Jul 14, 2026

Every blog post on our Astro site showed the wrong date — one day earlier than the frontmatter value. The root cause was simple, but the complete fix touched frontmatter, formatting, sorting, and the content schema.

Astro Cloudflare Pages JavaScript Dates Timezone