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Typescript Type Patterns

Category: Engineering  ·  Sub-category: languages  ·  Last updated:
lang:typescript
This skill should be used when writing TypeScript types, working with union types, implementing type guards or type predicates, using the satisfies operator, handling unknown or never types, creating discriminated unions, narrowing types, or modeling complex application state. Trigger on: "discriminated union", "type guard", "type predicate", "narrowing", "satisfies operator", "unknown type", "never type", "exhaustive switch", "is operator", "typeof check", "instanceof check", "union type pattern", "type narrowing", "as const pattern", "readonly type", "model state with types".

From the source SKILL.md

Control Flow Analysis (CFA) is the intelligence layer of the TypeScript compiler — it tracks the specific type of a variable at every point in the execution path. Mastering these patterns is essential for managing union types and building APIs that are impossible to misuse.

What this skill does

Typescript Type Patterns is a community-contributed Claude Code skill in the languages sub-category. It ships as a SKILL.md file that Claude Code auto-discovers under ~/.claude/skills/typescript-type-patterns/ and loads when your prompt matches the skill's trigger.

Who uses this skill

The Typescript Type Patterns Claude Code skill is built for software engineers, backend developers, full-stack teams, and technical leads building and maintaining production systems. It's part of ClaudSkills (also referred to as Claude Skills or Claude Code Skills) — the open community-curated registry of 69,000+ SKILL.md files for Anthropic's Claude Code agent and the wider Claude ecosystem (Claude API, Claude Agent SDK).

How to install

Free

Manual install (2 steps)

mkdir -p ~/.claude/skills/typescript-type-patterns
curl -L https://claudskills.com/skills/typescript-type-patterns/SKILL.md \
  -o ~/.claude/skills/typescript-type-patterns/SKILL.md

Or just download SKILL.md directly and drop it into ~/.claude/skills/typescript-type-patterns/. Claude Code auto-discovers it on next session.

Skills live at ~/.claude/skills/typescript-type-patterns/SKILL.md on macOS/Linux, or %USERPROFILE%\.claude\skills\typescript-type-patterns\SKILL.md on Windows. See the full install guide for step-by-step instructions.

Pro

One-click install via the desktop app

The ClaudSkills desktop app installs any skill directly into ~/.claude/skills/ with one click — no terminal required. Pro starts at $9/mo or $149 lifetime.

Pro

For the full experience including quality scoring and one-click install features for each skill — upgrade to Pro.

See pricing → Download desktop app

Attribution & license

More Engineering skills

Browse all Engineering skills in the ClaudSkills registry, or explore these other picks from the same category:

Browse all Engineering skills → Top 100 skills
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