Typescript Best Practices
bretzel-app/crumbs
Provides TypeScript patterns for type-first development, making illegal states unrepresentable, exhaustive handling, and runtime validation.
TS and JS conventions for eserstack packages: namespace imports, mod.ts entries, cross-runtime APIs, explicit checks, async, tests and laroux React components.
Install Javascript Practices
$ npx skills add eser/stack --skill javascript-practices -a claude-codeProject install by default; add -g for ~/.claude/skills/.
$ gh skill install eser/stack javascript-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/eser/stack.git skills-src && mkdir -p .claude/skills && cp -r skills-src/.agents/skills/javascript-practices .claude/skills/javascript-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 "javascript-practices" agent skill from https://github.com/eser/stack/tree/main/.agents/skills/javascript-practices into .claude/skills/javascript-practices/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "javascript-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/eser/stack/tree/main/.agents/skills/javascript-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 eser/stack --skill javascript-practices -a codexProject install goes to .agents/skills/; add -g for ~/.codex/skills/.
$ gh skill install eser/stack javascript-practices --agent codexProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/eser/stack.git skills-src && mkdir -p .agents/skills && cp -r skills-src/.agents/skills/javascript-practices .agents/skills/javascript-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 "javascript-practices" agent skill from https://github.com/eser/stack/tree/main/.agents/skills/javascript-practices into .agents/skills/javascript-practices/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "javascript-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 eser/stack --skill javascript-practices -a cursorProject install goes to .agents/skills/; add -g for ~/.cursor/skills/.
$ gh skill install eser/stack javascript-practices --agent cursorProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/eser/stack.git skills-src && mkdir -p .cursor/skills && cp -r skills-src/.agents/skills/javascript-practices .cursor/skills/javascript-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 "javascript-practices" agent skill from https://github.com/eser/stack/tree/main/.agents/skills/javascript-practices into .cursor/skills/javascript-practices/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "javascript-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/eser/stack.git --path .agents/skills/javascript-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 eser/stack --skill javascript-practices -a gemini-cliProject install goes to .agents/skills/; add -g for ~/.gemini/skills/.
$ gh skill install eser/stack javascript-practices --agent gemini-cliProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/eser/stack.git skills-src && mkdir -p .gemini/skills && cp -r skills-src/.agents/skills/javascript-practices .gemini/skills/javascript-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 "javascript-practices" agent skill from https://github.com/eser/stack/tree/main/.agents/skills/javascript-practices into .gemini/skills/javascript-practices/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "javascript-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 eser/stack javascript-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 eser/stack --skill javascript-practices -a github-copilotProject install goes to .agents/skills/; add -g for ~/.copilot/skills/.
$ git clone --depth 1 https://github.com/eser/stack.git skills-src && mkdir -p .github/skills && cp -r skills-src/.agents/skills/javascript-practices .github/skills/javascript-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 "javascript-practices" agent skill from https://github.com/eser/stack/tree/main/.agents/skills/javascript-practices into .github/skills/javascript-practices/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "javascript-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 eser/stack --skill javascript-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 eser/stack javascript-practices --agent opencodeProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/eser/stack.git skills-src && mkdir -p .opencode/skills && cp -r skills-src/.agents/skills/javascript-practices .opencode/skills/javascript-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 "javascript-practices" agent skill from https://github.com/eser/stack/tree/main/.agents/skills/javascript-practices into .opencode/skills/javascript-practices/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "javascript-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
javascript-practices- GitHub stars
- 128
- Token cost
- ~599 tokens
- SKILL.md length
- 200 words
- Files
- 6 (incl. references)
- Skills in repo
- 13
- Repo updated
- First seen
- Licence
- Custom licence
At a glance
TS and JS conventions for eserstack packages: namespace imports, mod.ts entries, cross-runtime APIs, explicit checks, async, tests and laroux React components.
- Tasks that involve React components
- SKILL.md covers Always and References
- Calls deno
What it does
Javascript Practices is an agent skill from eser/stack. TS and JS conventions for eserstack packages: namespace imports, mod.ts entries, cross-runtime APIs, explicit checks, async, tests and laroux React components. Use when writing or reviewing .ts, .tsx or .js files, Deno. or process.env use in libraries, imports, truthy or null checks flagged in review, tests or React UI. Not for Deno config or dependencies (use tooling-standards).
Its SKILL.md is about 600 tokens, which your agent loads only when the skill is triggered. The skill folder holds 7 other files, including reference files (for example `evals/triggers.json`, `references/modules.md` and `references/react.md`).
It sits in Frontend & Design, covering React components. It works with JavaScript, Deno, React and TypeScript. The repository describes itself as: The Portability Solution for Your Code! 🚀 Powered By Deno and JavaScript.
When your agent uses it
- Tasks that involve React components
Example prompts
- “/javascript-practices”
What it can do on your machine
Read from SKILL.md and the folder at commit 64939e6. 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
Shell commands in SKILL.md call:
deno
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
Javascript Practices loads about 599 tokens when it runs, and up to ~4.8k if it reads all its reference files. Until then it costs about 101 tokens; SKILL.md has 200 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
Its licence (Custom licence) doesn't allow us to republish the file, so here is its outline and opening line. It has 200 words (~599 tokens).
“How TypeScript is written in pkg/@eserstack/*: modules, runtime access, types, tests and React UI.”
- name
- javascript-practices
Files
SKILL.md and 5 other files (references) in .agents/skills/javascript-practices of eser/stack.
- SKILL.md
- evals/triggers.json
- references/modules.md
- references/react.md
- references/syntax-and-types.md
- references/testing.md
Open the folder on GitHubat commit 64939e6
Compare with similar skills
Javascript 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 |
|---|---|---|---|---|---|---|
| Javascript Practices this skilleser/stack | 128 | — | ~599 | Automated safety check: Pass | Custom licence | |
| Typescript Best Practicesbretzel-app/crumbs | 127 | 1 repos | ~2.2k | Automated safety check: Pass | MIT | |
| Connect Component To Figmadequelabs/cauldron | 129 | — | ~2k | Automated safety check: Pass | MPL-2.0 | |
| Fork And GoSimplePDF/simplepdf-embed | 407 | — | ~7.9k | Automated safety check: Notes | MIT | |
| Typescript Rulessoftspark/ai-toolkit | 179 | — | ~2.7k | Automated safety check: Notes | Apache-2.0 | |
| Web Artifacts Builderanthropics/skills | 180k | 40 repos | ~769 | Automated safety check: Pass | Apache-2.0 |
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Questions about Javascript Practices
What does Javascript Practices do?
TS and JS conventions for eserstack packages: namespace imports, mod.ts entries, cross-runtime APIs, explicit checks, async, tests and laroux React components. Javascript Practices is an agent skill from eser/stack.ts entries, cross-runtime APIs, explicit checks, async, tests and laroux React components.
When should I use Javascript Practices?
Javascript Practices fits situations like: tasks that involve React components.
How do I install Javascript Practices in Claude Code?
Run `npx skills add eser/stack --skill javascript-practices -a claude-code`. Or copy the skill folder (.agents/skills/javascript-practices in eser/stack) into .claude/skills/javascript-practices in your project. Claude Code loads it when a task matches its description.
How do I install Javascript Practices in Codex?
Run `npx skills add eser/stack --skill javascript-practices -a codex`. Or copy the skill folder (.agents/skills/javascript-practices in eser/stack) into .agents/skills/javascript-practices in your project. Codex loads it when a task matches its description.
Can I use Javascript 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 eser/stack --skill javascript-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/javascript-practices, .gemini/skills/javascript-practices, .github/skills/javascript-practices and .opencode/skills/javascript-practices in your project.
What does Javascript Practices need to run?
Going by SKILL.md and its folder, Javascript Practices needs the command-line tools its instructions call (deno).
Does Javascript 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 Javascript 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 Javascript Practices use?
Javascript Practices has a licence file (the repository's licence) that doesn't match a standard licence. Read it on GitHub before reusing the skill.
How many tokens does Javascript Practices use?
About 599 tokens (SKILL.md is roughly 2.4k 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 4.2k tokens, read only when the agent opens those files.
What are the alternatives to Javascript Practices?
Skills that share tags, products or a category with Javascript Practices: Typescript Best Practices (bretzel-app/crumbs, 127 stars), Connect Component To Figma (dequelabs/cauldron, 129 stars), Fork And Go (SimplePDF/simplepdf-embed, 407 stars) and Typescript Rules (softspark/ai-toolkit, 179 stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.
Who maintains Javascript Practices?
eser (a GitHub user) maintains it in eser/stack, which has 128 GitHub stars. The repository holds 13 skills in this directory. The repository was last updated on October 3, 2026.
Source: eser/stack on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.