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javascript

Production JavaScript and TypeScript playbook.

Skill by sshdkeyu

IndexedMIT
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Works with Claude Code, Claude apps, Codex, Cursor, Gemini CLI, GitHub Copilot, VS Code, OpenCode, Goose, Windsurf. Read the repository before you give any tool access to your data.

npx agentmarket install skill/sshdkeyu-javascript

Asks which of your tools to add it to (Claude Code, Codex, Cursor, VS Code, Windsurf, Gemini CLI, Claude Desktop) and shows the change first. See https://agentmart.dev/cli.

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About

Production JavaScript and TypeScript playbook. Use when writing or reviewing JS or TS: equality, types that disappear at runtime, async failures, parses, and untrusted HTML. Worked cases are in references/bad-vs-good.md. Where a loose JS tip conflicts with the TypeScript cases, follow the TypeScript case. Do not use for Go or for API-contract design.

Use cases: documents, design, frontend, backend

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Permissions

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

Tools
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Network hosts it talks to 1

  • codeload.github.com · found in install command

Files it touches

  • ~/.claude/skills/javascript

What's inside

Skill name
javascript
Description
Production JavaScript and TypeScript playbook. Use when writing or reviewing JS or TS: equality, types that disappear at runtime, async failures, parses, and untrusted HTML. Worked cases are in references/bad-vs-good.md. Where a loose JS tip conflicts with the TypeScript cases, follow the TypeScript case. Do not use for Go or for API-contract design.
License
MIT
Instructions
13 lines in SKILL.md · view on GitHub

Files (3)

  • README.md
  • SKILL.md
  • bad-vs-good.md · references/

SKILL.md (first lines)

# JavaScript and TypeScript

Rule `01` and rule `02` stay the floor. This skill is where JavaScript's coercions and TypeScript's erased types show up in production.

Read [references/bad-vs-good.md](references/bad-vs-good.md) when the change compares values, parses input, touches the DOM with user data, or annotates a type that came from outside the program. Prefer `for...of` over `forEach` when a TypeScript narrowing has to hold inside the loop.

## Done when

- Comparisons that decide control flow use `===` / `!==`, except a deliberate `== null` check for both `null` and `undefined`.
- Values from JSON, the DOM, or `catch` are narrowed before use. No `any`, `as`, or `!` without a runtime check next to it.
- A rejected promise is handled. User-controlled strings are not assigned to `innerHTML`.

From sshdkeyu/skill-prod-cursor, MIT.

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Last commit (this folder)
Oct 17, 2026 (11 days ago)

From GitHub (fetched Oct 24, 2026).

Details

License
MIT
Repository
github.com/sshdkeyu/skill-prod-cursor
First seen
Oct 24, 2026
Last checked
Oct 24, 2026
Source
GitHubgithub-graphql

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Cite this page

javascript skill. Agent Mart. https://agentmart.dev/skills/sshdkeyu-javascript (last updated 2026-10-24)