typescript-exhaustive-switch

Use when writing or editing TypeScript switch statements over discriminated unions or enums - enforces an exhaustive `never` check in the default case so…

Skill by paul-enz

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About

Use when writing or editing TypeScript switch statements over discriminated unions or enums - enforces an exhaustive `never` check in the default case so newly added variants produce compile-time failures until handled.

Use cases: writing

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What this skill can do and what it asks for, from its SKILL.md. Checked Oct 25, 2026.

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~/.claude/skills/typescript-exhaustive-switch

What's inside

Skill name: typescript-exhaustive-switch
Description: Use when writing or editing TypeScript switch statements over discriminated unions or enums - enforces an exhaustive `never` check in the default case so newly added variants produce compile-time failures until handled.
License: MIT
Instructions: 29 lines in SKILL.md · view on GitHub

Files (1)

SKILL.md

SKILL.md (first lines)

# TypeScript exhaustive switch

In switch statements over discriminated unions or enums, use a `never` check in the default case so newly added variants cause compile-time failures until handled.

## Pattern

```ts
function handle(event: Event) {
  switch (event.kind) {
    case "a":
      return doA(event);
    case "b":
      return doB(event);
    default: {
      const _exhaustive: never = event;
      throw new Error(`Unhandled event: ${JSON.stringify(_exhaustive)}`);
    }
  }
}
```

## Apply when

- Switching over a discriminated union (`type X = { kind: "a" } | { kind: "b" }`).
- Switching over a TypeScript `enum` or string-literal union.

Don't apply when the switch intentionally handles only a subset and falls through — but in that case prefer an `if` or a named helper rather than a non-exhaustive switch.

From paul-enz/claude-team-kit, MIT.

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Last commit (this folder): May 22, 2026 (5 months ago)

From GitHub (fetched Oct 24, 2026).

Details

License: MIT
Repository: github.com/paul-enz/claude-team-kit
First seen: Oct 24, 2026
Last checked: Oct 24, 2026
Source: GitHub github-graphql