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Agent skill

Typescript Language

by HoangNguyen0403 in HoangNguyen0403/agent-skills-standard

Apply modern TypeScript standards for type safety and maintainability.

MITAuto-check passedDevelopment

Install Typescript Language

skills CLI
$ npx skills add HoangNguyen0403/agent-skills-standard --skill typescript-language -a claude-code

Project install by default; add -g for ~/.claude/skills/.

GitHub CLI
$ gh skill install HoangNguyen0403/agent-skills-standard typescript-language --agent claude-code

Project scope by default; add --scope user for a personal install. Needs GitHub CLI 2.90.0 or later (public preview).

Manual copy
$ git clone --depth 1 https://github.com/HoangNguyen0403/agent-skills-standard.git skills-src && mkdir -p .claude/skills && cp -r skills-src/skills/typescript/typescript-language .claude/skills/typescript-language && rm -rf skills-src

Use ~/.claude/skills/ instead of .claude/skills for a personal install. The folder must contain SKILL.md.

Claude Code skills documentation · loads skills from .claude/skills/

Facts

Skill name
typescript-language
GitHub stars
572
Token cost
~720 tokens
SKILL.md length
234 words
Files
4 (incl. references)
Skills in repo
211
Repo updated
First seen
Licence
MIT

At a glance

Apply modern TypeScript standards for type safety and maintainability.

  • Working with types
  • SKILL.md covers Priority: P0 (CRITICAL), Implementation Guidelines, Anti-Patterns and Testing, plus 4 more sections
  • Instructions only: no scripts, shell commands, URLs or credentials in SKILL.md
  • Tsconfig settings

What it does

Typescript Language is an agent skill from HoangNguyen0403/agent-skills-standard. Apply modern TypeScript standards for type safety and maintainability. Use when working with types, interfaces, generics, enums, unions, or tsconfig settings.

Its SKILL.md is about 720 tokens, which your agent loads only when the skill is triggered. The skill folder holds 5 other files, including reference files (for example `evals/evals.json`, `references/REFERENCE.md` and `references/TESTING.md`).

It sits in Development, covering Type safety. It works with TypeScript. The repository describes itself as: A collection of Agent Skills Standard and Best Practice for Programming Languages, Frameworks that help our AI Agent follow best practies on frameworks and programming laguages. The licence is MIT.

When your agent uses it

  • Working with types
  • Tsconfig settings

Example prompts

  • “/typescript-language”

What it can do on your machine

Read from SKILL.md and the folder at commit b529c2d. It shows what the files ask for, not the result of running them.

  • Tool permissions

    Pre-approves nothing: there is no allowed-tools line, so your agent's usual permission prompts apply.

    From allowed-tools in the SKILL.md frontmatter.

  • Runs code

    No scripts in the folder and no shell commands in SKILL.md (its code samples are typescript).

    From the folder's file list and the shell code blocks in SKILL.md.

  • Network

    No URLs in SKILL.md.

    From URLs in SKILL.md, links to its own repository left out.

  • Credentials

    Names no API keys, tokens, secrets or passwords.

    From names ending in _API_KEY, _TOKEN, _SECRET, _KEY or _PASSWORD in SKILL.md.

Context cost

Typescript Language loads about 720 tokens when it runs, and up to ~1.6k if it reads all its reference files. Until then it costs about 45 tokens; SKILL.md has 234 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it
~45
When it runs · the whole SKILL.md, loaded when a task matches
~720
With references · SKILL.md plus every file in references/, read only if the agent opens them
~1.6k

Estimates: characters ÷ 4, the usual rule of thumb; real counts depend on the model's tokenizer. Scripts and assets cost tokens only if the agent reads them.

Safety

Auto-check passed

The automated check found no risky patterns in SKILL.md.

Automated static check — not a guarantee. Review scripts before installing. It scans the text of SKILL.md for risky patterns (piping downloads into a shell, reading credential files, hidden Unicode, destructive commands); files beside SKILL.md are not scanned.

SKILL.md

The full file from HoangNguyen0403/agent-skills-standard at commit b529c2d, republished under its MIT licence (© HoangNguyen0403). 234 words, ~720 tokens.

Download SKILL.mdSave it as .claude/skills/typescript-language/SKILL.md (or your agent's skills folder). This skill also uses 3 other files; get the full folder from GitHub.
name
typescript-language
description
Apply modern TypeScript standards for type safety and maintainability. Use when working with types, interfaces, generics, enums, unions, or tsconfig settings.

TypeScript Language Patterns

Priority: P0 (CRITICAL)

Implementation Guidelines

  • Type Annotations: Explicit params/returns. Infer locals.
  • Interfaces vs Types: interface for APIs (supports declaration merging). type for unions, intersection types, mapped/conditional types.
  • Strict Mode: strict: true. Null Safety: ?. and ?? — Use narrowing instead. Avoid non-null assertion (!) operator.
  • Enums: Literal unions or as const. No runtime enum.
  • Generics: Reusable, type-safe code.
  • Type Guards: typeof, instanceof, predicates.
  • Utility Types: Partial, Pick, Omit, Record.
  • Immutability: readonly arrays/objects. Const Assertions: as const, satisfies.
  • Template Literals: on${Capitalize<string>}.
  • Discriminated Unions: Literal kind property to narrow type safely. Switch on discriminant.
  • Advanced: Mapped, Conditional, Indexed types.
  • Access: Default public. Use private/protected or #private.
  • Branded Types: string & { __brand: 'Id' }.

Anti-Patterns

  • NEVER use any: Use unknown or specific interface instead.
  • No Function: Use signature () => void.
  • No enum: Runtime cost.
  • No !: Avoid non-null assertion (!). Use narrowing (typeof, instanceof, if-checks).
  • No Lint Disable: Fix root cause; never suppress.

Testing

  • Mocking: Use jest.Mocked<T> or as unknown as T.
  • Checklist: Check method existence, match error constants, satisfy required properties.
  • References: See references/TESTING.md for common issues/solutions.

Code

typescript
// Branded Type
type UserId = string & { __brand: 'Id' };

// Satisfies (Validate + Infer)
const cfg = { port: 3000 } satisfies Record<string, number>;

// Discriminated Union
type Result<T> = { kind: 'ok'; data: T } | { kind: 'err'; error: Error };

Verification

After any type change that crosses module boundaries or involves generics, unions, conditional types, or branded types: call getDiagnostics (typescript-lsp MCP tool) to confirm no type errors before finalizing.

References

For advanced type patterns and utility types: See references/REFERENCE.md.

Canonical response anchors

When this skill applies, preserve the following domain terminology or equivalent concrete examples in the answer when relevant:

  • Discriminated Union
  • kind

© HoangNguyen0403, MIT. Rendered from Markdown: HTML in the file is shown as text, images as links, and headings moved down two levels. Raw file

Files

SKILL.md and 3 other files (references) in skills/typescript/typescript-language of HoangNguyen0403/agent-skills-standard.

  • SKILL.md
  • evals/evals.json
  • references/REFERENCE.md
  • references/TESTING.md

Open the folder on GitHubat commit b529c2d

Compare with similar skills

Typescript Language next to the 5 skills that share the most tags, products or categories with it. Stars are the repository's; “used in” counts other GitHub owners with a copy.

Typescript Language compared with similar skills
SkillStarsUsed inTokensAuto-checkLicenceRepo updated
Typescript Language this skillHoangNguyen0403/agent-skills-standard572—~720Automated safety check: PassMIT
Typescript Advanced Typesrolling-scopes/rsschool-app10k25 repos~4.2kAutomated safety check: PassMPL-2.0
Wagmi Feature Developmentwevm/wagmi6.8k—~3.8kAutomated safety check: PassMIT
Convert Internal Package to TypeScriptTryGhost/Ghost56k—~1.2kAutomated safety check: PassMIT
Add NodeBridge Handlerneovateai/neovate-code1.6k—~1kAutomated safety check: PassMIT
AST Visitor Pattern for Unionsprisma/orm48k—~830Automated safety check: PassApache-2.0

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  • Typescript Advanced Types

    rolling-scopes/rsschool-app

    Master TypeScript's advanced type system including generics, conditional types, mapped types, template literals, and utility types for building type-safe applications.

    10k GitHub starsUsed in 25 repos~4.2k tokens
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    wevm/wagmi

    Walks through adding a Wagmi feature across its layers: a Viem-based core action, TanStack Query options, and React and Vue bindings.

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    1.6k GitHub stars~1k tokensUpdated 6 mo ago
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Works with

Categories

Questions about Typescript Language

What does Typescript Language do?

Apply modern TypeScript standards for type safety and maintainability. Typescript Language is an agent skill from HoangNguyen0403/agent-skills-standard. Apply modern TypeScript standards for type safety and maintainability.

When should I use Typescript Language?

Typescript Language fits situations like: working with types; tsconfig settings.

How do I install Typescript Language in Claude Code?

Run `npx skills add HoangNguyen0403/agent-skills-standard --skill typescript-language -a claude-code`. Or copy the skill folder (skills/typescript/typescript-language in HoangNguyen0403/agent-skills-standard) into .claude/skills/typescript-language in your project. Claude Code loads it when a task matches its description.

How do I install Typescript Language in Codex?

Run `npx skills add HoangNguyen0403/agent-skills-standard --skill typescript-language -a codex`. Or copy the skill folder (skills/typescript/typescript-language in HoangNguyen0403/agent-skills-standard) into .agents/skills/typescript-language in your project. Codex loads it when a task matches its description.

Can I use Typescript Language in Cursor, Gemini CLI or GitHub Copilot?

Cursor, Gemini CLI, GitHub Copilot and OpenCode also load SKILL.md folders. With the skills CLI, run `npx skills add HoangNguyen0403/agent-skills-standard --skill typescript-language -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/typescript-language, .gemini/skills/typescript-language, .github/skills/typescript-language and .opencode/skills/typescript-language in your project.

What does Typescript Language need to run?

SKILL.md names no scripts, command-line tools or credentials: Typescript Language is instructions for the agent only.

Does Typescript Language access the network?

SKILL.md contains no URLs. Any network use would come from the scripts or tools the agent runs. This is read from the text; nothing was executed.

Is Typescript Language safe to install?

Our automated static check of SKILL.md found no risky patterns, such as piping downloads into a shell, reading credential files or hidden Unicode. It is not a guarantee. Review the folder before installing.

What licence does Typescript Language use?

Typescript Language is published under the MIT licence (the repository's licence). It allows redistribution, so the full SKILL.md is shown on this page.

How many tokens does Typescript Language use?

About 720 tokens (SKILL.md is roughly 2.9k characters). Agents keep only the skill's name and description in context until a task matches; then they load SKILL.md in full. Its references folder adds about 913 tokens, read only when the agent opens those files.

What are the alternatives to Typescript Language?

Skills that share tags, products or a category with Typescript Language: Typescript Advanced Types (rolling-scopes/rsschool-app, 10k stars), Wagmi Feature Development (wevm/wagmi, 6.8k stars), Convert Internal Package to TypeScript (TryGhost/Ghost, 56k stars) and Add NodeBridge Handler (neovateai/neovate-code, 1.6k stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.

Who maintains Typescript Language?

HoangNguyen0403 (a GitHub user) maintains it in HoangNguyen0403/agent-skills-standard, which has 572 GitHub stars. The repository holds 211 skills in this directory. The repository was last updated on October 9, 2026.

Source: HoangNguyen0403/agent-skills-standard on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.