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Claude Code strict-typescript-review for unsafe index access

Review changed TypeScript for missing values, incomplete union branches, and runtime validation of external data.

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Install in Claude Code

Provide the changed TypeScript files and tsconfig in Claude Code. Identify the external data boundaries relevant for runtime validation.

  1. Review `.claude/skills/strict-typescript-review/SKILL.md` and its requirements at the pinned GitHub commit.
  2. Create `.claude/skills/strict-typescript-review/` in your project and save the reviewed file as `.claude/skills/strict-typescript-review/SKILL.md`.
  3. Start Claude Code from that project's root, then select `/strict-typescript-review` in the slash menu.

Example task

In ts-37, code reads title from items[0]. The input is {items: []}, and the required display for an empty array is “No items”.

What to check

Mark the unchecked index as FAIL. Handle a missing element before reading title so {items: []} displays “No items”.

Original SKILL.md on GitHub · Updated

Frequently asked question

Can TypeScript types replace runtime validation?

Check external content at the boundary. Use a type guard or the project’s validation flow before passing data into code that expects a verified structure.