130 Widgets

Building tools. Learning to build tools. Learning to build learning tools.

Building a Theme-Aware
VS Code Extension

A walkthrough for programmers learning VS Code extension development, HSL color science, and zero-dependency PNG encoding — from a small, polished extension.

TypeScript VS Code Extension API HSL Color Space PNG Encoding djb2 Hashing CRC-32

Getting Started

0

Preface & Orientation

What Color Identity does, what you’ll learn, the six-file map
1

Extension Anatomy Extension

package.json, activation events, commands, configuration schema

Arc 1 — Color Science

2

Types & Configuration Arch

Shared interfaces, reading workspace settings, the ColorIdentityConfig contract
3

Hashing Names to Colors Color

The djb2 hash algorithm, deterministic hue generation, and the HSL color space
4

Theme-Aware Color Generation Color

Theme profiles, HSL-to-hex conversion, deriving a full palette from a single hue

Arc 2 — VS Code Integration

5

Reading & Writing Workspace Settings Extension

workbench.colorCustomizations, merging without clobbering, clean removal
6

The Color Picker UI Extension

QuickPick API, named presets, live swatches, custom hue input
7

PNG Swatch Generation from Scratch Arch

PNG file format, DEFLATE compression, CRC-32 checksums — no image library needed

Arc 3 — Bringing It Together

8

Extension Lifecycle & Event-Driven Reactivity Extension

activate/deactivate, status bar, theme change listeners, configuration watchers
9

Packaging, Publishing & Next Steps

vsce, .vsix bundles, the VS Code Marketplace, and ideas for extending the extension

130 Widgets

Building a Theme-AwareVS Code Extension

Building a Theme-Aware
VS Code Extension