Use when applying functional design in TypeScript without a functional library, including branded types, discriminated unions, and hand-rolled Result.
Install
npx skills add yutna/functional-design-skills --skill functional-typescriptnpx skills add yutna/functional-design-skills --skill functional-typescript -a claude-code -gnpx skills add yutna/functional-design-skills --skill functional-typescript -a codex -ggemini skills install https://github.com/yutna/functional-design-skills.git --path plugin/skills/functional-typescriptgh skill install yutna/functional-design-skills functional-typescriptgit clone --depth 1 https://github.com/yutna/functional-design-skills /tmp/yutna__functional-design-skills
mkdir -p ~/.claude/skills ~/.agents/skills
cp -R /tmp/yutna__functional-design-skills/plugin/skills/functional-typescript ~/.claude/skills/functional-typescript # Claude Code
cp -R /tmp/yutna__functional-design-skills/plugin/skills/functional-typescript ~/.agents/skills/functional-typescript # Codex, Cursor, Gemini CLI, Copilot, OpenCode