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.
Resolve an open technical question by measuring it on real Bun instead of assuming, then record the verified result in docs/architecture/constraints.md.
Install Spike
$ npx skills add petarzarkov/dunx --skill spike -a claude-codeProject install by default; add -g for ~/.claude/skills/.
$ gh skill install petarzarkov/dunx spike --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/petarzarkov/dunx.git skills-src && mkdir -p .claude/skills && cp -r skills-src/.claude/skills/spike .claude/skills/spike && 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 "spike" agent skill from https://github.com/petarzarkov/dunx/tree/main/.claude/skills/spike into .claude/skills/spike/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "spike", 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/petarzarkov/dunx/tree/main/.claude/skills/spikeType 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 petarzarkov/dunx --skill spike -a codexProject install goes to .agents/skills/; add -g for ~/.codex/skills/.
$ gh skill install petarzarkov/dunx spike --agent codexProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/petarzarkov/dunx.git skills-src && mkdir -p .agents/skills && cp -r skills-src/.claude/skills/spike .agents/skills/spike && rm -rf skills-srcUse ~/.agents/skills/ instead of .agents/skills for a personal install.
Codex skills documentation · loads skills from .agents/skills/
Install the "spike" agent skill from https://github.com/petarzarkov/dunx/tree/main/.claude/skills/spike into .agents/skills/spike/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "spike", 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 petarzarkov/dunx --skill spike -a cursorProject install goes to .agents/skills/; add -g for ~/.cursor/skills/.
$ gh skill install petarzarkov/dunx spike --agent cursorProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/petarzarkov/dunx.git skills-src && mkdir -p .cursor/skills && cp -r skills-src/.claude/skills/spike .cursor/skills/spike && 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 "spike" agent skill from https://github.com/petarzarkov/dunx/tree/main/.claude/skills/spike into .cursor/skills/spike/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "spike", 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/petarzarkov/dunx.git --path .claude/skills/spike--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 petarzarkov/dunx --skill spike -a gemini-cliProject install goes to .agents/skills/; add -g for ~/.gemini/skills/.
$ gh skill install petarzarkov/dunx spike --agent gemini-cliProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/petarzarkov/dunx.git skills-src && mkdir -p .gemini/skills && cp -r skills-src/.claude/skills/spike .gemini/skills/spike && 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 "spike" agent skill from https://github.com/petarzarkov/dunx/tree/main/.claude/skills/spike into .gemini/skills/spike/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "spike", 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 petarzarkov/dunx spikeInstalls 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 petarzarkov/dunx --skill spike -a github-copilotProject install goes to .agents/skills/; add -g for ~/.copilot/skills/.
$ git clone --depth 1 https://github.com/petarzarkov/dunx.git skills-src && mkdir -p .github/skills && cp -r skills-src/.claude/skills/spike .github/skills/spike && 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 "spike" agent skill from https://github.com/petarzarkov/dunx/tree/main/.claude/skills/spike into .github/skills/spike/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "spike", 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 petarzarkov/dunx --skill spike -a opencodeOpenCode documents no install command of its own. Project install goes to .agents/skills/; add -g for ~/.config/opencode/skills/.
$ gh skill install petarzarkov/dunx spike --agent opencodeProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/petarzarkov/dunx.git skills-src && mkdir -p .opencode/skills && cp -r skills-src/.claude/skills/spike .opencode/skills/spike && 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 "spike" agent skill from https://github.com/petarzarkov/dunx/tree/main/.claude/skills/spike into .opencode/skills/spike/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "spike", 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
spike- GitHub stars
- 100
- Token cost
- ~742 tokens
- SKILL.md length
- 373 words
- Files
- 1
- Skills in repo
- 6
- Repo updated
- First seen
- Licence
- MIT
At a glance
Resolve an open technical question by measuring it on real Bun instead of assuming, then record the verified result in docs/architecture/constraints.md.
- Works in 6 steps: State the question as a falsifiable… → Write a throwaway probe in the… → Run it on real Bun and record bun… → …
- An open item in docs/ROADMAP.md that turns on runtime behaviour
- SKILL.md covers Procedure and Rules
- Calls bun
What it does
Spike is an agent skill from petarzarkov/dunx. Resolve an open technical question by measuring it on real Bun instead of assuming, then record the verified result in docs/architecture/constraints.md. Use for an open item in docs/ROADMAP.md that turns on runtime behaviour, before committing to any API shape that depends on runtime or tsc behaviour, and whenever a design argument turns on "does Bun/TypeScript actually do X?".
Its SKILL.md is about 740 tokens, which your agent loads only when the skill is triggered. It is a single SKILL.md file with no bundled scripts.
It sits in Development. It works with TypeScript. The repository describes itself as: fastest web DI framework. NestJS-style structure at Bun speed. Constructor DI with no reflect-metadata, no experimentalDecorators, no JavaScript router. The licence is MIT.
When your agent uses it
- An open item in docs/ROADMAP.md that turns on runtime behaviour
- Before committing to any API shape that depends on runtime
- Whenever a design argument turns on does Bun/TypeScript actually do X?
Example prompts
- “does Bun/TypeScript actually do X?”
- “/spike”
Workflow steps
6 steps, taken from the first numbered list in SKILL.md.
- State the question as a falsifiable claim and name what it gates, for
- Write a throwaway probe in the scratchpad directory, never under
- Run it on real Bun and record bun --version alongside the output. A
- Delegate the probing when it is noisy or wide. Give a subagent the claim
- Record the result in docs/architecture/constraints.md, under the topic it
- Delete the probe.
What it can do on your machine
Read from SKILL.md and the folder at commit d8be36b. 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:
bun
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
Spike loads about 742 tokens when it runs. Until then it costs about 97 tokens; SKILL.md has 373 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 petarzarkov/dunx at commit d8be36b, republished under its MIT licence (© petarzarkov). 373 words, ~742 tokens.
Download SKILL.mdSave it as
.claude/skills/spike/SKILL.md (or your agent's skills folder).- name
- spike
- description
- Resolve an open technical question by measuring it on real Bun instead of assuming, then record the verified result in docs/architecture/constraints.md. Use for an open item in docs/ROADMAP.md that turns on runtime behaviour, before committing to any API shape that depends on runtime or tsc behaviour, and whenever a design argument turns on "does Bun/TypeScript actually do X?".
/spike
An entry in docs/architecture/constraints.md
cites the probe or type-check output it rests on, which is why the decisions built
on it hold. A spike adds entries of that kind. Open questions live in the Open items section of
docs/ROADMAP.md, one file each under
internal/notes/roadmap/.
Procedure
- State the question as a falsifiable claim and name what it gates, for
example "does
@Post(path, { body: Schema })constrain the method signature through the method decorator's generic?" gates the typed-input API. - Write a throwaway probe in the scratchpad directory, never under
packages/orexamples/. It is not code that ships and it must not reach a commit, a coverage run, or a build. - Run it on real Bun and record
bun --versionalongside the output. A type-level question runs through the repo'stscinstead; record its version. - Delegate the probing when it is noisy or wide. Give a subagent the claim and the probe location; ask back for the literal command, the literal output, and a one-line verdict. Iterating a decorator probe through six type errors is exactly the kind of output that should never enter the main thread.
- Record the result in docs/architecture/constraints.md, under the topic it
belongs to:
- confirmed → an entry with the command, the Bun version, and the literal
output in a fenced block. Match the existing terseness - the
paramtypes: [ "Db", "Object", "Number" ]entry is the model. - refuted → write down the fallback and why, under the decision it affects. A rejected approach recorded is the whole point of that document.
- If the question came from an Open items row in docs/ROADMAP.md, update
its file under
internal/notes/roadmap/, or delete it and the row when the spike settles it. A resolved question left listed is worse than no list.
- confirmed → an entry with the command, the Bun version, and the literal
output in a fenced block. Match the existing terseness - the
- Delete the probe.
Show full SKILL.md (78 more words)Show less
Rules
- Never write "should work", "presumably", or "in theory" into docs/architecture/constraints.md. If it was not run, it does not go in.
- A spike that changes the public API shape belongs before the code it gates, not after.
- One spike, one claim. Two questions are two probes.
- Probes may use anything - including the dialects this repo bans in shipped code
(
experimentalDecorators,reflect-metadata) if refuting them is the point. That is how the existingemitDecoratorMetadataentry was produced. Scratchpad only.
© petarzarkov, MIT. Rendered from Markdown: HTML in the file is shown as text, images as links, and headings moved down two levels. Raw file
Files
Just SKILL.md in .claude/skills/spike of petarzarkov/dunx.
Open the folder on GitHubat commit d8be36b
Compare with similar skills
Spike 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 |
|---|---|---|---|---|---|---|
| Spike this skillpetarzarkov/dunx | 100 | — | ~742 | Automated safety check: Pass | MIT | |
| Typescript Advanced Typesrolling-scopes/rsschool-app | 10k | 25 repos | ~4.2k | Automated safety check: Pass | MPL-2.0 | |
| Code Review ChecklistshareAI-lab/learn-claude-code | 78k | 4 repos | ~1.1k | Automated safety check: Pass | MIT | |
| Nx Importnrwl/nx | 29k | 6 repos | ~3.5k | Automated safety check: Pass | MIT | |
| Install Anti-Slop Oxlint Rulesdmmulroy/anti-slop | 5.4k | — | ~2.2k | Automated safety check: Pass | MIT | |
| OpenTUI Terminal Interfacescline/cline | 70k | — | ~1.9k | Automated safety check: Pass | Apache-2.0 |
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Import, merge, or combine repositories into an Nx workspace using nx import.
Install Anti-Slop Oxlint Rules
dmmulroy/anti-slop
Installs, updates or migrates the vendored anti-slop Oxlint plugin in a repository, keeping local rule changes and the plugin's license and provenance files.
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cline/cline
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Reviews frontend changes under `web/` or `packages/dify-ui/` for concrete defects and broken project contracts, using routed rule packs and a severity scale for findings.
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Related
Works with
Categories
Questions about Spike
What does Spike do?
Resolve an open technical question by measuring it on real Bun instead of assuming, then record the verified result in docs/architecture/constraints.md. Spike is an agent skill from petarzarkov/dunx.md.
When should I use Spike?
Spike fits situations like: an open item in docs/ROADMAP.md that turns on runtime behaviour; before committing to any API shape that depends on runtime; whenever a design argument turns on does Bun/TypeScript actually do X?.
How do I install Spike in Claude Code?
Run `npx skills add petarzarkov/dunx --skill spike -a claude-code`. Or copy the skill folder (.claude/skills/spike in petarzarkov/dunx) into .claude/skills/spike in your project. Claude Code loads it when a task matches its description.
How do I install Spike in Codex?
Run `npx skills add petarzarkov/dunx --skill spike -a codex`. Or copy the skill folder (.claude/skills/spike in petarzarkov/dunx) into .agents/skills/spike in your project. Codex loads it when a task matches its description.
Can I use Spike 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 petarzarkov/dunx --skill spike -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/spike, .gemini/skills/spike, .github/skills/spike and .opencode/skills/spike in your project.
What does Spike need to run?
Going by SKILL.md and its folder, Spike needs the command-line tools its instructions call (bun).
Does Spike 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 Spike 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 Spike use?
Spike 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 Spike use?
About 742 tokens (SKILL.md is roughly 3k characters). Agents keep only the skill's name and description in context until a task matches; then they load SKILL.md in full.
What are the alternatives to Spike?
Skills that share tags, products or a category with Spike: Typescript Advanced Types (rolling-scopes/rsschool-app, 10k stars), Code Review Checklist (shareAI-lab/learn-claude-code, 78k stars), Nx Import (nrwl/nx, 29k stars) and Install Anti-Slop Oxlint Rules (dmmulroy/anti-slop, 5.4k stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.
Who maintains Spike?
petarzarkov (a GitHub user) maintains it in petarzarkov/dunx, which has 100 GitHub stars. The repository holds 6 skills in this directory. The repository was last updated on October 8, 2026.
Source: petarzarkov/dunx on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.