RuView Hardware Setup
ruvnet/RuView
Brings a RuView CSI sensing node online by building ESP32-S3 or ESP32-C6 firmware, flashing the board, provisioning WiFi and checking the serial output.
A skill your agent uses when writing, reviewing, or debugging JavaScript — reasoning about type coercion, equality, this, closures, scope/hoisting, prototypes, async/promises, iterators, modules, or…
$ npx skills add BlueAndi/Pixelix --skill javascript-reference -a claude-codeProject install by default; add -g for ~/.claude/skills/.
$ gh skill install BlueAndi/Pixelix javascript-reference --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/BlueAndi/Pixelix.git skills-src && mkdir -p .claude/skills && cp -r skills-src/.claude/skills/javascript-reference .claude/skills/javascript-reference && 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-reference" agent skill from https://github.com/BlueAndi/Pixelix/tree/master/.claude/skills/javascript-reference into .claude/skills/javascript-reference/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "javascript-reference", 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/BlueAndi/Pixelix/tree/master/.claude/skills/javascript-referenceType 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 BlueAndi/Pixelix --skill javascript-reference -a codexProject install goes to .agents/skills/; add -g for ~/.codex/skills/.
$ gh skill install BlueAndi/Pixelix javascript-reference --agent codexProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/BlueAndi/Pixelix.git skills-src && mkdir -p .agents/skills && cp -r skills-src/.claude/skills/javascript-reference .agents/skills/javascript-reference && 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-reference" agent skill from https://github.com/BlueAndi/Pixelix/tree/master/.claude/skills/javascript-reference into .agents/skills/javascript-reference/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "javascript-reference", 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 BlueAndi/Pixelix --skill javascript-reference -a cursorProject install goes to .agents/skills/; add -g for ~/.cursor/skills/.
$ gh skill install BlueAndi/Pixelix javascript-reference --agent cursorProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/BlueAndi/Pixelix.git skills-src && mkdir -p .cursor/skills && cp -r skills-src/.claude/skills/javascript-reference .cursor/skills/javascript-reference && 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-reference" agent skill from https://github.com/BlueAndi/Pixelix/tree/master/.claude/skills/javascript-reference into .cursor/skills/javascript-reference/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "javascript-reference", 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/BlueAndi/Pixelix.git --path .claude/skills/javascript-reference--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 BlueAndi/Pixelix --skill javascript-reference -a gemini-cliProject install goes to .agents/skills/; add -g for ~/.gemini/skills/.
$ gh skill install BlueAndi/Pixelix javascript-reference --agent gemini-cliProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/BlueAndi/Pixelix.git skills-src && mkdir -p .gemini/skills && cp -r skills-src/.claude/skills/javascript-reference .gemini/skills/javascript-reference && 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-reference" agent skill from https://github.com/BlueAndi/Pixelix/tree/master/.claude/skills/javascript-reference into .gemini/skills/javascript-reference/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "javascript-reference", 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 BlueAndi/Pixelix javascript-referenceInstalls 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 BlueAndi/Pixelix --skill javascript-reference -a github-copilotProject install goes to .agents/skills/; add -g for ~/.copilot/skills/.
$ git clone --depth 1 https://github.com/BlueAndi/Pixelix.git skills-src && mkdir -p .github/skills && cp -r skills-src/.claude/skills/javascript-reference .github/skills/javascript-reference && 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-reference" agent skill from https://github.com/BlueAndi/Pixelix/tree/master/.claude/skills/javascript-reference into .github/skills/javascript-reference/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "javascript-reference", 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 BlueAndi/Pixelix --skill javascript-reference -a opencodeOpenCode documents no install command of its own. Project install goes to .agents/skills/; add -g for ~/.config/opencode/skills/.
$ gh skill install BlueAndi/Pixelix javascript-reference --agent opencodeProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/BlueAndi/Pixelix.git skills-src && mkdir -p .opencode/skills && cp -r skills-src/.claude/skills/javascript-reference .opencode/skills/javascript-reference && 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-reference" agent skill from https://github.com/BlueAndi/Pixelix/tree/master/.claude/skills/javascript-reference into .opencode/skills/javascript-reference/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "javascript-reference", 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.
javascript-referenceA skill your agent uses when writing, reviewing, or debugging JavaScript — reasoning about type coercion, equality, this, closures, scope/hoisting, prototypes, async/promises, iterators, modules, or…
Javascript Reference is an agent skill from BlueAndi/Pixelix. Use when writing, reviewing, or debugging JavaScript — reasoning about type coercion, equality, this, closures, scope/hoisting, prototypes, async/promises, iterators, modules, or the standard built-in objects, and when checking behavior against the ECMA-262 (ECMAScript 2025) language standard. Covers the language itself; host/runtime APIs (DOM, Node, browser) are out of scope.
Its SKILL.md is about 2.4k tokens, which your agent loads only when the skill is triggered. The skill folder holds 4 other files (for example `async-and-iteration.md`, `builtins.md` and `language-core.md`).
It sits in Development, covering Embedded systems. It works with JavaScript and ESP32. The repository describes itself as: Full RGB LED matrix, based on an ESP32 and WS2812B LEDs or emulated LEDs on TFT. The licence is MIT.
Read from SKILL.md and the folder at commit 10209e7. 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.
From the folder's file list and the shell code blocks in SKILL.md.
Links to these hosts (documentation or services it may open):
tc39.esFrom 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.
Javascript Reference loads about 2.4k tokens when it runs. Until then it costs about 101 tokens; SKILL.md has 872 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 BlueAndi/Pixelix at commit 10209e7, republished under its MIT licence (© BlueAndi). 872 words, ~2,354 tokens.
.claude/skills/javascript-reference/SKILL.md (or your agent's skills folder). This skill also uses 4 other files; get the full folder from GitHub.ECMA-262 defines the JavaScript language: its syntax, type system, evaluation semantics, and standard built-in objects. It does not define the DOM, fetch, console, Node's fs, timers, or modules resolution — those are host environments layered on top. This skill is the condensed-but-authoritative reference for the language itself.
Core principle: Most JS bugs come from a handful of semantics that are precise but unintuitive — coercion, == vs ===, this binding, closures over mutable bindings, floating-point, and reference vs value semantics. Reason from the spec's rules, not from what "looks right."
ECMAScript is versioned yearly; ES2025 is the 16th edition. Features here are annotated with the edition that introduced them where it matters. When behavior is contested, the linked spec is the source of truth.
this value is what it is, or predicting output of a tricky snippet.let/const/var, ==/===, for...of/for...in/forEach, class fields vs prototype, Map vs object.async/await, the microtask/task ordering, error propagation, cancellation.NaN checks, integer precision, prototype pollution).Not for: DOM/BOM, Node/Deno/Bun APIs, fetch/network, bundlers, TypeScript types, or framework patterns. Those are host/tooling concerns, not ECMA-262.
Everything is one of 8 language types. 7 primitives + object:
| Type | typeof | Notes |
|---|---|---|
| Undefined | "undefined" | sole value undefined |
| Null | "object" ⚠️ | sole value null; the typeof null bug is spec-mandated |
| Boolean | "boolean" | true / false |
| Number | "number" | IEEE-754 double; NaN, Infinity, -0 all exist |
| BigInt | "bigint" | arbitrary precision, literal 10n; never mixes with Number in arithmetic |
| String | "string" | immutable sequence of UTF-16 code units (not code points) |
| Symbol | "symbol" | unique immutable identifier |
| Object | "object" / "function" | callable objects report "function" |
Primitives are immutable and compared by value; objects are compared by reference. Assignment and argument passing copy the reference for objects — mutations are shared (aliasing).
Full details → language-core.md (types, coercion, equality, scope, this, prototypes).
Falsy values (exactly 8) — everything else is truthy (including "0", "false", [], {}):
false 0 -0 0n "" null undefined NaN=== (strict) — no coercion; different types ⇒ not equal. NaN === NaN is false. +0 === -0 is true.
== (loose) — coerces; avoid it. Only defensible use: x == null (true for null and undefined).
Object.is — like === but Object.is(NaN, NaN) is true and Object.is(+0, -0) is false.
Declarations:
| Scope | Hoist | Reassign | Redeclare | TDZ | |
|---|---|---|---|---|---|
var | function | yes (→undefined) | yes | yes | no |
let | block | yes (uninit) | yes | no | yes |
const | block | yes (uninit) | no* | no | yes |
*const binds the binding, not the value — a const object is still mutable.
Number checks: Number.isNaN(x) (not global isNaN), Number.isInteger, Number.isSafeInteger, Number.MAX_SAFE_INTEGER (2⁵³−1). 0.1 + 0.2 !== 0.3.
| Feature | What it gives you |
|---|---|
| Iterator helpers | Lazy Iterator.prototype.{map,filter,take,drop,flatMap,reduce,toArray,forEach,some,every,find}, Iterator.from() — compose over any iterator without materializing arrays. |
| Set methods | Set.prototype.{union,intersection,difference,symmetricDifference,isSubsetOf,isSupersetOf,isDisjointFrom}. |
Promise.try(fn) | Run a possibly-sync-throwing fn and get a promise (sync throws become rejections). |
RegExp.escape(str) | Escape a string for safe literal use inside a RegExp. |
| Float16 | Float16Array, DataView.prototype.{getFloat16,setFloat16}, Math.f16round. |
| Duplicate named groups | Same (?<name>…) in different regex alternatives. |
| Import attributes + JSON modules | import cfg from "./c.json" with { type: "json" }. |
| RegExp modifiers | Inline flags: (?i:…) / (?-i:…) scope i/m/s to part of a pattern. |
Details and pre-2025 modern features (ES2015→2024) → syntax-and-features.md.
| File | Contents |
|---|---|
| language-core.md | Types & values, coercion rules (ToPrimitive/ToNumber/ToString), equality algorithms, truthiness, scope/hoisting/TDZ, closures, this binding, prototypes & inheritance, strict mode, class internals. |
| syntax-and-features.md | Modern syntax edition-by-edition (ES2015→ES2025): destructuring, spread/rest, arrow functions, classes & private fields, modules, optional chaining, nullish coalescing, logical assignment, generators, and the full ES2025 additions. |
| async-and-iteration.md | Job queue (microtask vs macrotask), Promises + combinators, async/await, error propagation, iteration protocols, generators, async iterators, for await…of. |
| builtins.md | Standard library: Object, Array, String, Number/Math, Map/Set/WeakMap/WeakSet/WeakRef, JSON, RegExp, Symbol, Reflect, Proxy, typed arrays/ArrayBuffer, Intl, Date (and the emerging Temporal). |
| Mistake | Reality / fix |
|---|---|
if (x == null) conflated with all falsy checks | == null matches only null/undefined; 0/""/NaN are not null. Use it deliberately. |
arr.indexOf(NaN) / === NaN | NaN is never equal to anything. Use Number.isNaN, arr.includes(NaN), or Array.prototype.findIndex. |
Expecting 0.1 + 0.2 === 0.3 | Floating point. Compare with an epsilon, or use integers/BigInt/decimal libs. |
this "lost" in a callback | this is set by call site, not definition (except arrow fns, which capture lexically). Use arrow, .bind, or class fields. |
var/let in a loop with async callbacks | var shares one binding; let/const create a fresh binding per iteration. Prefer let/const. |
| Mutating a shared object/array thinking it's copied | Objects pass by reference. Copy explicitly (spread, structuredClone, Array.from). Spread is shallow. |
for...in to iterate arrays | for...in enumerates string keys incl. inherited; order not guaranteed for integer-like intent. Use for...of, forEach, or entries(). |
sort() without a comparator on numbers | Default sort is by UTF-16 string order: [1,2,10].sort() → [1,10,2]. Pass (a,b)=>a-b. (TypedArray sort is numeric by default — the opposite.) |
typeof x === "object" to detect objects | null is also "object". Use x !== null && typeof x === "object", or Array.isArray, etc. |
Adding a property to Object.prototype | Prototype pollution; breaks for...in/in everywhere. Never. |
async function "returns a value" | It returns a Promise. Callers must await/.then. Unhandled rejections are silent-ish. |
await inside a forEach | forEach ignores the returned promise. Use for…of with await, or Promise.all(map(...)). |
© BlueAndi, MIT. Rendered from Markdown: HTML in the file is shown as text, images as links, and headings moved down two levels. Raw file
SKILL.md and 4 other files in .claude/skills/javascript-reference of BlueAndi/Pixelix.
Open the folder on GitHubat commit 10209e7
Javascript Reference 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 Reference this skillBlueAndi/Pixelix | 443 | — | ~2.4k | Automated safety check: Pass | MIT | |
| RuView Hardware Setupruvnet/RuView | 97k | — | ~1.8k | Automated safety check: Notes | MIT | |
| Esp32 Firmware Engineeralxv2016/folloup-sticky | 115 | 1 repos | ~3.8k | Automated safety check: Pass | GPL-3.0 | |
| RuView mmWave Radar Setupruvnet/RuView | 97k | — | ~907 | Automated safety check: Notes | MIT | |
| Embedded DebugFastLED/FastLED | 7.5k | — | ~1.4k | Automated safety check: Pass | MIT | |
| Auto EmbeddedDunCanYounG-1/MICU-auto-embedded | 253 | — | ~1.6k | Automated safety check: Pass | CC-BY-NC-4.0 |
ruvnet/RuView
Brings a RuView CSI sensing node online by building ESP32-S3 or ESP32-C6 firmware, flashing the board, provisioning WiFi and checking the serial output.
alxv2016/folloup-sticky
ESP32 firmware engineering for ESP-IDF projects. An agent skill from alxv2016/folloup-sticky.
ruvnet/RuView
Sets up and runs 60 GHz and 24 GHz mmWave radar sensing on ESP32 boards in RuView, alone or fused with WiFi CSI.
FastLED/FastLED
Firmware crash analysis, stack trace decoder, and register dump interpreter for ESP32/ARM/AVR platforms.
DunCanYounG-1/MICU-auto-embedded
全平台嵌入式 AI 开发框架(对标 Trellis):把 RIPER-5 五阶段协议 + 四文件记忆 + 分层架构门禁 + Scout/Builder/Verifier 多 Agent + 24 个工具调用技能(build/flash/debug/serial/can/modbus/visa/static/memory/rtos/scons),做成『装进工程、项目级 hook…
FastLED/FastLED
Parse and classify ESP32 serial log output to identify FastLED-related errors, RMT/I2S/SPI driver faults, timing violations, RTOS issues, and crash signatures.
BlueAndi/Pixelix
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Works with
Categories
A skill your agent uses when writing, reviewing, or debugging JavaScript — reasoning about type coercion, equality, this, closures, scope/hoisting, prototypes, async/promises, iterators, modules, or…. Javascript Reference is an agent skill from BlueAndi/Pixelix. Use when writing, reviewing, or debugging JavaScript — reasoning about type coercion, equality, this, closures, scope/hoisting, prototypes, async/promises, iterators, modules, or the standard built-in objects, and when checking behavior against the ECMA-262 (ECMAScript 2025) language standard.
Javascript Reference fits situations like: debugging JavaScript — reasoning about type coercion; the standard built-in objects; when checking behavior against the ECMA-262 (ECMAScript 202; language standard.
Run `npx skills add BlueAndi/Pixelix --skill javascript-reference -a claude-code`. Or copy the skill folder (.claude/skills/javascript-reference in BlueAndi/Pixelix) into .claude/skills/javascript-reference in your project. Claude Code loads it when a task matches its description.
Run `npx skills add BlueAndi/Pixelix --skill javascript-reference -a codex`. Or copy the skill folder (.claude/skills/javascript-reference in BlueAndi/Pixelix) into .agents/skills/javascript-reference 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 BlueAndi/Pixelix --skill javascript-reference -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-reference, .gemini/skills/javascript-reference, .github/skills/javascript-reference and .opencode/skills/javascript-reference in your project.
SKILL.md names no scripts, command-line tools or credentials: Javascript Reference is instructions for the agent only.
SKILL.md names 1 domain. As links in the text: tc39.es. 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.
Javascript Reference is published under the MIT licence (the repository's licence). It allows redistribution, so the full SKILL.md is shown on this page.
About 2.4k tokens (SKILL.md is roughly 9.4k 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 Javascript Reference: RuView Hardware Setup (ruvnet/RuView, 97k stars), Esp32 Firmware Engineer (alxv2016/folloup-sticky, 115 stars), RuView mmWave Radar Setup (ruvnet/RuView, 97k stars) and Embedded Debug (FastLED/FastLED, 7.5k stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.
BlueAndi (a GitHub user) maintains it in BlueAndi/Pixelix, which has 443 GitHub stars. The repository holds 7 skills in this directory. The repository was last updated on October 6, 2026.
Source: BlueAndi/Pixelix on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.