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.
TypeScript type safety guidelines for writing maximally type-safe code.
Install TS Best Practices
$ npx skills add poteto/noodle --skill ts-best-practices -a claude-codeProject install by default; add -g for ~/.claude/skills/.
$ gh skill install poteto/noodle ts-best-practices --agent claude-codeProject scope by default; add --scope user for a personal install. Needs GitHub CLI 2.90.0 or later (public preview).
$ git clone --depth 1 https://github.com/poteto/noodle.git skills-src && mkdir -p .claude/skills && cp -r skills-src/.agents/skills/ts-best-practices .claude/skills/ts-best-practices && rm -rf skills-srcUse ~/.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/
Install the "ts-best-practices" agent skill from https://github.com/poteto/noodle/tree/main/.agents/skills/ts-best-practices into .claude/skills/ts-best-practices/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "ts-best-practices", then confirm the skill loads.Claude Code copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$skill-installer install https://github.com/poteto/noodle/tree/main/.agents/skills/ts-best-practicesType this inside Codex. $skill-installer <name> installs a curated skill from openai/skills. The installer writes to $CODEX_HOME/skills (default ~/.codex/skills). Restart Codex if the skill does not show up.
$ npx skills add poteto/noodle --skill ts-best-practices -a codexProject install goes to .agents/skills/; add -g for ~/.codex/skills/.
$ gh skill install poteto/noodle ts-best-practices --agent codexProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/poteto/noodle.git skills-src && mkdir -p .agents/skills && cp -r skills-src/.agents/skills/ts-best-practices .agents/skills/ts-best-practices && rm -rf skills-srcUse ~/.agents/skills/ instead of .agents/skills for a personal install.
Codex skills documentation · loads skills from .agents/skills/
Install the "ts-best-practices" agent skill from https://github.com/poteto/noodle/tree/main/.agents/skills/ts-best-practices into .agents/skills/ts-best-practices/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "ts-best-practices", then confirm the skill loads.Codex copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ npx skills add poteto/noodle --skill ts-best-practices -a cursorProject install goes to .agents/skills/; add -g for ~/.cursor/skills/.
$ gh skill install poteto/noodle ts-best-practices --agent cursorProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/poteto/noodle.git skills-src && mkdir -p .cursor/skills && cp -r skills-src/.agents/skills/ts-best-practices .cursor/skills/ts-best-practices && rm -rf skills-srcUse ~/.cursor/skills/ instead of .cursor/skills for a personal install.
Cursor skills documentation · loads skills from .cursor/skills/, .agents/skills/, .claude/skills/, .codex/skills/
Install the "ts-best-practices" agent skill from https://github.com/poteto/noodle/tree/main/.agents/skills/ts-best-practices into .cursor/skills/ts-best-practices/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "ts-best-practices", then confirm the skill loads.Cursor copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ gemini skills install https://github.com/poteto/noodle.git --path .agents/skills/ts-best-practices--scope user (default) or --scope workspace; --path is the subfolder of the repo that holds the skill; --consent skips the security confirmation prompt.
$ npx skills add poteto/noodle --skill ts-best-practices -a gemini-cliProject install goes to .agents/skills/; add -g for ~/.gemini/skills/.
$ gh skill install poteto/noodle ts-best-practices --agent gemini-cliProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/poteto/noodle.git skills-src && mkdir -p .gemini/skills && cp -r skills-src/.agents/skills/ts-best-practices .gemini/skills/ts-best-practices && rm -rf skills-srcUse ~/.gemini/skills/ instead of .gemini/skills for a personal install, then run /skills reload.
Gemini CLI skills documentation · loads skills from .gemini/skills/, .agents/skills/
Install the "ts-best-practices" agent skill from https://github.com/poteto/noodle/tree/main/.agents/skills/ts-best-practices into .gemini/skills/ts-best-practices/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "ts-best-practices", then confirm the skill loads.Gemini CLI copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ gh skill install poteto/noodle ts-best-practicesInstalls for Copilot at project scope by default; add --scope user for a personal install. Preview a skill first with gh skill preview. Needs GitHub CLI 2.90.0 or later (public preview).
$ npx skills add poteto/noodle --skill ts-best-practices -a github-copilotProject install goes to .agents/skills/; add -g for ~/.copilot/skills/.
$ git clone --depth 1 https://github.com/poteto/noodle.git skills-src && mkdir -p .github/skills && cp -r skills-src/.agents/skills/ts-best-practices .github/skills/ts-best-practices && rm -rf skills-srcUse ~/.copilot/skills/ instead of .github/skills for a personal install. Commit .github/skills so cloud agent and code review can use it.
GitHub Copilot skills documentation · loads skills from .github/skills/, .claude/skills/, .agents/skills/
Install the "ts-best-practices" agent skill from https://github.com/poteto/noodle/tree/main/.agents/skills/ts-best-practices into .github/skills/ts-best-practices/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "ts-best-practices", then confirm the skill loads.GitHub Copilot copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ npx skills add poteto/noodle --skill ts-best-practices -a opencodeOpenCode documents no install command of its own. Project install goes to .agents/skills/; add -g for ~/.config/opencode/skills/.
$ gh skill install poteto/noodle ts-best-practices --agent opencodeProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/poteto/noodle.git skills-src && mkdir -p .opencode/skills && cp -r skills-src/.agents/skills/ts-best-practices .opencode/skills/ts-best-practices && rm -rf skills-srcUse ~/.config/opencode/skills/ instead of .opencode/skills for a personal install.
OpenCode skills documentation · loads skills from .opencode/skills/, .claude/skills/, .agents/skills/
Install the "ts-best-practices" agent skill from https://github.com/poteto/noodle/tree/main/.agents/skills/ts-best-practices into .opencode/skills/ts-best-practices/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "ts-best-practices", then confirm the skill loads.OpenCode copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
Facts
- Skill name
ts-best-practices- GitHub stars
- 447
- Token cost
- ~452 tokens
- SKILL.md length
- 157 words
- Files
- 2 (incl. references)
- Skills in repo
- 26
- Repo updated
- First seen
- Licence
- MIT
At a glance
TypeScript type safety guidelines for writing maximally type-safe code.
- Writing TypeScript code
- Instructions only: no scripts, shell commands, URLs or credentials in SKILL.md
- Reviewing TypeScript for type safety issues
- The user mentions type safety
What it does
TS Best Practices is an agent skill from poteto/noodle. TypeScript type safety guidelines for writing maximally type-safe code. Apply these patterns when writing or reviewing any TypeScript: discriminated unions, type narrowing, type guards, exhaustiveness checks, avoiding as casts, preferring unknown over any, and making impossible states unrepresentable. Use this skill whenever writing TypeScript code, reviewing TypeScript for type safety issues, or when the user mentions type safety, type narrowing, discriminated unions, or asks to make types stricter/more explicit.
Its SKILL.md is about 450 tokens, which your agent loads only when the skill is triggered. The skill folder holds 2 other files, including reference files (for example `references/patterns.md`).
It sits in Development, covering Type safety. It works with TypeScript. The repository describes itself as: Orchestrate agents using skills. The licence is MIT.
When your agent uses it
- Writing TypeScript code
- Reviewing TypeScript for type safety issues
- The user mentions type safety
- Discriminated unions
Example prompts
- “/ts-best-practices”
What it can do on your machine
Read from SKILL.md and the folder at commit 82d2921. 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.
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
TS Best Practices loads about 452 tokens when it runs, and up to ~1.5k if it reads all its reference files. Until then it costs about 136 tokens; SKILL.md has 157 words of instructions outside code blocks.
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 poteto/noodle at commit 82d2921, republished under its MIT licence (© poteto). 157 words, ~452 tokens.
Download SKILL.mdSave it as
.claude/skills/ts-best-practices/SKILL.md (or your agent's skills folder). This skill also uses 1 other file; get the full folder from GitHub.- name
- ts-best-practices
- description
- TypeScript type safety guidelines for writing maximally type-safe code. Apply these patterns when writing or reviewing any TypeScript: discriminated unions, type narrowing, type guards, exhaustiveness checks, avoiding `as` casts, preferring `unknown` over `any`, and making impossible states unrepresentable. Use this skill whenever writing TypeScript code, reviewing TypeScript for type safety issues, or when the user mentions type safety, type narrowing, discriminated unions, or asks to make types stricter/more explicit.
Type Safety
This project's TypeScript policy. Apply when writing or reviewing TypeScript.
| Rule | Summary |
|---|---|
No as casts | Every as is a potential runtime crash. Validate at boundaries, then cast only if earned. Prefer Zod/Valibot over manual validation. |
unknown over any | any disables type checking for everything it touches. External data is always unknown. |
| Discriminated unions | Model variants with a shared literal discriminant. No optional-field bags. |
| Narrowing hierarchy | Prefer: discriminated union switch > in operator > typeof/instanceof > type guard > as |
| Type guards | Must actually verify the claim. Name them isX or hasX. Prefer discriminant narrowing when possible. |
| Exhaustiveness checks | Always add default: never arm to switches over discriminated unions. Use an absurd() helper to reduce boilerplate. |
satisfies over as | When verifying a value matches a type without widening, use satisfies to preserve literal types. |
| Impossible states | If a bug requires asking "can this combination happen?" the type is too loose. Tighten it. |
Read references/patterns.md for code examples of each rule.
© poteto, 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 1 other file (references) in .agents/skills/ts-best-practices of poteto/noodle.
- SKILL.md
- references/patterns.md
Open the folder on GitHubat commit 82d2921
Compare with similar skills
TS Best Practices 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.
| Skill | Stars | Used in | Tokens | Auto-check | Licence | Repo updated |
|---|---|---|---|---|---|---|
| TS Best Practices this skillpoteto/noodle | 447 | — | ~452 | Automated safety check: Pass | MIT | |
| Typescript Advanced Typesrolling-scopes/rsschool-app | 10k | 25 repos | ~4.2k | Automated safety check: Pass | MPL-2.0 | |
| Wagmi Feature Developmentwevm/wagmi | 6.8k | — | ~3.8k | Automated safety check: Pass | MIT | |
| Convert Internal Package to TypeScriptTryGhost/Ghost | 56k | — | ~1.2k | Automated safety check: Pass | MIT | |
| Add NodeBridge Handlerneovateai/neovate-code | 1.6k | — | ~1k | Automated safety check: Pass | MIT | |
| AST Visitor Pattern for Unionsprisma/orm | 48k | — | ~830 | Automated safety check: Pass | Apache-2.0 |
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Moves a legacy internal Ghost package from JavaScript and CommonJS to TypeScript and ESM in three focused commits that keep git file history intact.
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- Official
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Categories
Questions about TS Best Practices
What does TS Best Practices do?
TypeScript type safety guidelines for writing maximally type-safe code. TS Best Practices is an agent skill from poteto/noodle. TypeScript type safety guidelines for writing maximally type-safe code.
When should I use TS Best Practices?
TS Best Practices fits situations like: writing TypeScript code; reviewing TypeScript for type safety issues; the user mentions type safety; discriminated unions.
How do I install TS Best Practices in Claude Code?
Run `npx skills add poteto/noodle --skill ts-best-practices -a claude-code`. Or copy the skill folder (.agents/skills/ts-best-practices in poteto/noodle) into .claude/skills/ts-best-practices in your project. Claude Code loads it when a task matches its description.
How do I install TS Best Practices in Codex?
Run `npx skills add poteto/noodle --skill ts-best-practices -a codex`. Or copy the skill folder (.agents/skills/ts-best-practices in poteto/noodle) into .agents/skills/ts-best-practices in your project. Codex loads it when a task matches its description.
Can I use TS Best Practices 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 poteto/noodle --skill ts-best-practices -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/ts-best-practices, .gemini/skills/ts-best-practices, .github/skills/ts-best-practices and .opencode/skills/ts-best-practices in your project.
What does TS Best Practices need to run?
SKILL.md names no scripts, command-line tools or credentials: TS Best Practices is instructions for the agent only.
Does TS Best Practices 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 TS Best Practices 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 TS Best Practices use?
TS Best Practices 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 TS Best Practices use?
About 452 tokens (SKILL.md is roughly 1.8k 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 1k tokens, read only when the agent opens those files.
What are the alternatives to TS Best Practices?
Skills that share tags, products or a category with TS Best Practices: 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 TS Best Practices?
poteto (a GitHub user) maintains it in poteto/noodle, which has 447 GitHub stars. The repository holds 26 skills in this directory. The repository was last updated on March 19, 2026.
Source: poteto/noodle on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.