Vercel Composition Patterns
supabase/supabase
React composition patterns that scale. An agent skill from supabase/supabase.
Deep, partial matching of nested structs, slices, maps, and pointers with gstruct — MatchAllFields/MatchFields/Fields, MatchAllElements/MatchElements/Elements (idFn), MatchAllKeys/MatchKeys/Keys…
$ npx skills add onsi/gomega --skill gstruct -a claude-codeProject install by default; add -g for ~/.claude/skills/.
$ gh skill install onsi/gomega gstruct --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/onsi/gomega.git skills-src && mkdir -p .claude/skills && cp -r skills-src/plugins/gomega/skills/gstruct .claude/skills/gstruct && 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 "gstruct" agent skill from https://github.com/onsi/gomega/tree/master/plugins/gomega/skills/gstruct into .claude/skills/gstruct/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "gstruct", 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/onsi/gomega/tree/master/plugins/gomega/skills/gstructType 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 onsi/gomega --skill gstruct -a codexProject install goes to .agents/skills/; add -g for ~/.codex/skills/.
$ gh skill install onsi/gomega gstruct --agent codexProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/onsi/gomega.git skills-src && mkdir -p .agents/skills && cp -r skills-src/plugins/gomega/skills/gstruct .agents/skills/gstruct && rm -rf skills-srcUse ~/.agents/skills/ instead of .agents/skills for a personal install.
Codex skills documentation · loads skills from .agents/skills/
Install the "gstruct" agent skill from https://github.com/onsi/gomega/tree/master/plugins/gomega/skills/gstruct into .agents/skills/gstruct/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "gstruct", 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 onsi/gomega --skill gstruct -a cursorProject install goes to .agents/skills/; add -g for ~/.cursor/skills/.
$ gh skill install onsi/gomega gstruct --agent cursorProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/onsi/gomega.git skills-src && mkdir -p .cursor/skills && cp -r skills-src/plugins/gomega/skills/gstruct .cursor/skills/gstruct && 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 "gstruct" agent skill from https://github.com/onsi/gomega/tree/master/plugins/gomega/skills/gstruct into .cursor/skills/gstruct/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "gstruct", 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/onsi/gomega.git --path plugins/gomega/skills/gstruct--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 onsi/gomega --skill gstruct -a gemini-cliProject install goes to .agents/skills/; add -g for ~/.gemini/skills/.
$ gh skill install onsi/gomega gstruct --agent gemini-cliProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/onsi/gomega.git skills-src && mkdir -p .gemini/skills && cp -r skills-src/plugins/gomega/skills/gstruct .gemini/skills/gstruct && 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 "gstruct" agent skill from https://github.com/onsi/gomega/tree/master/plugins/gomega/skills/gstruct into .gemini/skills/gstruct/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "gstruct", 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 onsi/gomega gstructInstalls 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 onsi/gomega --skill gstruct -a github-copilotProject install goes to .agents/skills/; add -g for ~/.copilot/skills/.
$ git clone --depth 1 https://github.com/onsi/gomega.git skills-src && mkdir -p .github/skills && cp -r skills-src/plugins/gomega/skills/gstruct .github/skills/gstruct && 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 "gstruct" agent skill from https://github.com/onsi/gomega/tree/master/plugins/gomega/skills/gstruct into .github/skills/gstruct/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "gstruct", 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 onsi/gomega --skill gstruct -a opencodeOpenCode documents no install command of its own. Project install goes to .agents/skills/; add -g for ~/.config/opencode/skills/.
$ gh skill install onsi/gomega gstruct --agent opencodeProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/onsi/gomega.git skills-src && mkdir -p .opencode/skills && cp -r skills-src/plugins/gomega/skills/gstruct .opencode/skills/gstruct && 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 "gstruct" agent skill from https://github.com/onsi/gomega/tree/master/plugins/gomega/skills/gstruct into .opencode/skills/gstruct/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "gstruct", 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.
gstructDeep, partial matching of nested structs, slices, maps, and pointers with gstruct — MatchAllFields/MatchFields/Fields, MatchAllElements/MatchElements/Elements (idFn), MatchAllKeys/MatchKeys/Keys…
Gstruct is an agent skill from onsi/gomega. Deep, partial matching of nested structs, slices, maps, and pointers with gstruct — MatchAllFields/MatchFields/Fields, MatchAllElements/MatchElements/Elements (idFn), MatchAllKeys/MatchKeys/Keys, PointTo, and the IgnoreExtras/IgnoreMissing/IgnoreUnexportedExtras/AllowDuplicates options, plus Ignore()/Reject(). Use when asserting against large or deeply nested data structures where you want to apply a different matcher to each field, element, or key.
Its SKILL.md is about 1.7k 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. The repository describes itself as: Ginkgo's Preferred Matcher Library. The licence is MIT.
Read from SKILL.md and the folder at commit 37fa900. It shows what the files ask for, not the result of running them.
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.
No scripts in the folder and no shell commands in SKILL.md (its code samples are go).
From the folder's file list and the shell code blocks in SKILL.md.
Links to these hosts (documentation or services it may open):
onsi.github.ioFrom URLs in SKILL.md, links to its own repository left out.
Names no API keys, tokens, secrets or passwords.
From names ending in _API_KEY, _TOKEN, _SECRET, _KEY or _PASSWORD in SKILL.md.
Gstruct loads about 1.7k tokens when it runs. Until then it costs about 115 tokens; SKILL.md has 463 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.
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.
The full file from onsi/gomega at commit 37fa900, republished under its MIT licence (© onsi). 463 words, ~1,675 tokens.
.claude/skills/gstruct/SKILL.md (or your agent's skills folder).gstruct builds composite matchers that apply a separate matcher to each field of a struct, each element of a slice, each key of a map, or the target of a pointer. It is the tool for fuzzy-matching large, deeply nested values. Docs: https://onsi.github.io/gomega/#gstruct-testing-complex-data-types.
Dot-import gomega; import gstruct normally (or dot-import it too):
import (
. "github.com/onsi/gomega"
"github.com/onsi/gomega/gstruct"
)The values in Fields/Elements/Keys are themselves matchers. That is the whole point: compose with the core catalog (gomega:matchers) and combinators like And/Or/Not/WithTransform (gomega:composing-matchers). Examples below assume gstruct is dot-imported for brevity.
If you find yourself building an overly complex gstruct matcher, consider if you should be building a custom matcher (gomega:custom-matchers) instead.
FieldsFields is map[string]types.GomegaMatcher keyed by field name.
actual := struct {
A int
B bool
C string
}{5, true, "foo"}
Expect(actual).To(MatchAllFields(Fields{
"A": BeNumerically("<", 10),
"B": BeTrue(),
"C": Equal("foo"),
}))MatchAllFields requires an exact 1:1 mapping — every field must have a matcher and every matcher must map to a field. This is great for maintainability: adding or removing a struct field breaks the test until you update it.
To match a subset/superset, use MatchFields(options, Fields{...}):
// IgnoreExtras: ignore struct fields with no matcher
Expect(actual).To(MatchFields(IgnoreExtras, Fields{
"A": BeNumerically("<", 10),
"B": BeTrue(), // no entry for C — fine
}))
// IgnoreMissing: ignore matchers with no corresponding field
Expect(actual).To(MatchFields(IgnoreMissing, Fields{
"A": BeNumerically("<", 10),
"B": BeTrue(),
"C": Equal("foo"),
"D": Equal("bar"), // ignored — actual has no field D
}))IgnoreUnexportedExtras is a middle ground: it ignores only unexported extra fields (gstruct can't read them via reflect anyway) while still requiring all exported fields to be matched.
Elements + an id functionElements is map[string]types.GomegaMatcher keyed by a string id. You supply an Identifier (func(element any) string) that maps each element to its key.
actual := []string{"A: foo bar baz", "B: once upon a time", "C: the end"}
id := func(element any) string { return string(element.(string)[0]) }
Expect(actual).To(MatchAllElements(id, Elements{
"A": Not(BeZero()),
"B": MatchRegexp("[A-Z]: [a-z ]+"),
"C": ContainSubstring("end"),
}))MatchAllElements requires a 1:1 mapping. Use MatchElements(id, options, Elements{...}) with IgnoreExtras/IgnoreMissing to relax, exactly as with fields. AllowDuplicates lets several elements share one key/matcher (all of them must pass).
Index-based variants MatchAllElementsWithIndex/MatchElementsWithIndex take an IdentifierWithIndex (func(index int, element any) string); the built-in IndexIdentity just uses the index as the key.
KeysThe *Fields API has a *Keys mirror for maps: MatchAllKeys(Keys{...}) and MatchKeys(options, Keys{...}).
actual := map[string]string{"A": "correct", "B": "incorrect"}
// MatchAllKeys requires every key be matched (this would fail without B):
Expect(actual).To(MatchAllKeys(Keys{
"A": Equal("correct"),
"B": Equal("incorrect"),
}))
// IgnoreMissing tolerates matchers for absent keys:
Expect(actual).To(MatchKeys(IgnoreMissing, Keys{
"A": Equal("correct"),
"B": Equal("incorrect"),
"C": Equal("whatever"), // ignored — actual has no key C
}))PointToPointTo(matcher) dereferences a pointer and applies matcher to the pointed-to value. It fails if the pointer is nil.
foo := 5
Expect(&foo).To(PointTo(Equal(5)))
var bar *int
Expect(bar).NotTo(PointTo(BeNil())) // nil pointer fails PointToIgnore() and Reject()Ignore() always succeeds, Reject() always fails — use them as entries to skip a field/element or to assert one must never appear.
The matchers nest arbitrarily, mixing struct/slice/map/pointer matchers with the core catalog:
coreID := func(element any) string { return strconv.Itoa(element.(CoreStats).Index) }
Expect(actual).To(MatchAllFields(Fields{
"Name": Ignore(),
"StartTime": BeTemporally(">=", time.Now().Add(-100*time.Hour)),
"CPU": PointTo(MatchAllFields(Fields{
"Time": BeTemporally(">=", time.Now().Add(-time.Hour)),
"UsageNanoCores": BeNumerically("~", 1e9, 1e8),
"UsageCoreNanoSeconds": BeNumerically(">", 1e6),
"Cores": MatchElements(coreID, IgnoreExtras, Elements{
"0": MatchAllFields(Fields{
"Index": Ignore(),
"UsageNanoCores": BeNumerically("<", 1e9),
"UsageCoreNanoSeconds": BeNumerically(">", 1e5),
}),
}),
})),
"Memory": PointTo(MatchAllFields(Fields{
"Time": BeTemporally(">=", time.Now().Add(-time.Hour)),
"AvailableBytes": BeZero(),
"UsageBytes": BeNumerically(">", 5e6),
"WorkingSetBytes": BeNumerically(">", 5e6),
})),
"Rootfs": Ignore(),
"Logs": Ignore(),
}))MatchAllFields/MatchAllElements/MatchAllKeys fail on missing OR extra entries. They demand an exact 1:1 mapping. The instant you want a partial match, switch to MatchFields/MatchElements/MatchKeys and pass IgnoreExtras, IgnoreMissing, or both (IgnoreExtras|IgnoreMissing).AllowDuplicates. Don't derive keys from data that changes between runs.Elements keys are strings. The id function returns a string, so numeric ids must be stringified (e.g. strconv.Itoa(i)), and the keys in your Elements{} literal must match those strings exactly.PointTo rejects nil pointers — a nil actual fails the match outright, before the inner matcher ever runs.gomega:matchers and gomega:composing-matchers.© onsi, MIT. Rendered from Markdown: HTML in the file is shown as text, images as links, and headings moved down two levels. Raw file
Just SKILL.md in plugins/gomega/skills/gstruct of onsi/gomega.
Open the folder on GitHubat commit 37fa900
Gstruct 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 |
|---|---|---|---|---|---|---|
| Gstruct this skillonsi/gomega | 2.4k | — | ~1.7k | Automated safety check: Pass | MIT | |
| Vercel Composition Patternssupabase/supabase | 111k | 59 repos | ~726 | Automated safety check: Pass | MIT | |
| Finishing a Development Branchobra/superpowers | 296k | 5 repos | ~1.9k | Automated safety check: Pass | MIT | |
| Typescript Advanced Typesrolling-scopes/rsschool-app | 10k | 25 repos | ~4.2k | Automated safety check: Pass | MPL-2.0 | |
| PR Babysitteropeninterpreter/openinterpreter | 69k | 3 repos | ~4.2k | Automated safety check: Pass | Apache-2.0 | |
| Code Review ChecklistshareAI-lab/learn-claude-code | 78k | 5 repos | ~1.1k | Automated safety check: Pass | MIT |
supabase/supabase
React composition patterns that scale. An agent skill from supabase/supabase.
obra/superpowers
Walks the last step of a branch: confirm tests pass, detect the git environment, ask how to integrate, carry out your choice and clean up the worktree.
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.
openinterpreter/openinterpreter
Watches an open GitHub pull request until it merges, handling review comments, diagnosing CI failures and retrying flaky checks along the way.
shareAI-lab/learn-claude-code
Reviews code against a five-part checklist covering security, correctness, performance, maintainability and testing, and reports findings in a fixed format.
onyx-dot-app/onyx
Iteratively improves a PR (GitHub), MR (GitLab), or shelved changelist (Perforce) until Greptile gives it a 5/5 confidence score with zero unresolved comments.
onsi/gomega
Write correct synchronous Gomega assertions — Expect/Ω notation, the To/NotTo/ToNot/Should/ShouldNot equivalences, the multi-return error idiom, Succeed vs HaveOccurred, the .Error() chaining form…
onsi/gomega
Polling assertions in Gomega — Eventually (poll until it passes) and Consistently (must keep passing), the func(g Gomega) callback idiom, WithTimeout/WithPolling/Within/ProbeEvery, WithContext and…
onsi/gomega
Build compound Gomega assertions by combining matchers — And/SatisfyAll (all pass), Or/SatisfyAny (any pass), Not (negate), WithTransform to map the actual before matching, Satisfy for an ad-hoc…
onsi/gomega
Writing your own Gomega matchers — the GomegaMatcher interface (Match/FailureMessage/NegatedFailureMessage), gcustom.MakeMatcher with message templates and template data, the format package helpers…
onsi/gomega
Testing streaming io buffers with gbytes — gbytes.NewBuffer() (an io.Writer also returned by gexec sessions), the Say(regexp) matcher that forward-scans from a moving read cursor, the canonical…
onsi/gomega
Testing external processes with gexec — compile binaries with Build/BuildWithEnvironment/BuildIn and CleanupBuildArtifacts, start them with Start returning a Session, await exit with the Exit…
Categories
Deep, partial matching of nested structs, slices, maps, and pointers with gstruct — MatchAllFields/MatchFields/Fields, MatchAllElements/MatchElements/Elements (idFn), MatchAllKeys/MatchKeys/Keys…. Gstruct is an agent skill from onsi/gomega. Deep, partial matching of nested structs, slices, maps, and pointers with gstruct — MatchAllFields/MatchFields/Fields, MatchAllElements/MatchElements/Elements (idFn), MatchAllKeys/MatchKeys/Keys, PointTo, and the IgnoreExtras/IgnoreMissing/IgnoreUnexportedExtras/AllowDuplicates options, plus Ignore()/Reject().
Gstruct fits situations like: asserting against large; deeply nested data structures where you want to apply a different matcher to each field.
Run `npx skills add onsi/gomega --skill gstruct -a claude-code`. Or copy the skill folder (plugins/gomega/skills/gstruct in onsi/gomega) into .claude/skills/gstruct in your project. Claude Code loads it when a task matches its description.
Run `npx skills add onsi/gomega --skill gstruct -a codex`. Or copy the skill folder (plugins/gomega/skills/gstruct in onsi/gomega) into .agents/skills/gstruct in your project. Codex loads it when a task matches its description.
Cursor, Gemini CLI, GitHub Copilot and OpenCode also load SKILL.md folders. With the skills CLI, run `npx skills add onsi/gomega --skill gstruct -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/gstruct, .gemini/skills/gstruct, .github/skills/gstruct and .opencode/skills/gstruct in your project.
SKILL.md names no scripts, command-line tools or credentials: Gstruct is instructions for the agent only.
SKILL.md names 1 domain. As links in the text: onsi.github.io. This is read from the text; nothing was executed.
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.
Gstruct is published under the MIT licence (the repository's licence). It allows redistribution, so the full SKILL.md is shown on this page.
About 1.7k tokens (SKILL.md is roughly 6.7k characters). Agents keep only the skill's name and description in context until a task matches; then they load SKILL.md in full.
Skills that share tags, products or a category with Gstruct: Vercel Composition Patterns (supabase/supabase, 111k stars), Finishing a Development Branch (obra/superpowers, 296k stars), Typescript Advanced Types (rolling-scopes/rsschool-app, 10k stars) and PR Babysitter (openinterpreter/openinterpreter, 69k stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.
onsi (a GitHub user) maintains it in onsi/gomega, which has 2,357 GitHub stars. The repository holds 12 skills in this directory. The repository was last updated on September 24, 2026.
Source: onsi/gomega on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.