Triage Support Bundle
netdata/netdata
Investigate a Netdata support bundle offline - the archive netdata-support-bundle produces - to explain one host's alerts, missing data, collector failures, crashes, high CPU or memory, streaming…
A skill your agent uses when reviewing scripts, client components, bundles, or runtime behavior related to Prefer const and let over var.
MITAuto-check passed
Install Const Let
$ npx skills add thedaviddias/Front-End-Checklist --skill const-let -a claude-codeProject install by default; add -g for ~/.claude/skills/.
$ gh skill install thedaviddias/Front-End-Checklist const-let --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/thedaviddias/Front-End-Checklist.git skills-src && mkdir -p .claude/skills && cp -r skills-src/skills/const-let .claude/skills/const-let && 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 "const-let" agent skill from https://github.com/thedaviddias/Front-End-Checklist/tree/main/skills/const-let into .claude/skills/const-let/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "const-let", 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/thedaviddias/Front-End-Checklist/tree/main/skills/const-letType 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 thedaviddias/Front-End-Checklist --skill const-let -a codexProject install goes to .agents/skills/; add -g for ~/.codex/skills/.
$ gh skill install thedaviddias/Front-End-Checklist const-let --agent codexProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/thedaviddias/Front-End-Checklist.git skills-src && mkdir -p .agents/skills && cp -r skills-src/skills/const-let .agents/skills/const-let && rm -rf skills-srcUse ~/.agents/skills/ instead of .agents/skills for a personal install.
Codex skills documentation · loads skills from .agents/skills/
Install the "const-let" agent skill from https://github.com/thedaviddias/Front-End-Checklist/tree/main/skills/const-let into .agents/skills/const-let/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "const-let", 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 thedaviddias/Front-End-Checklist --skill const-let -a cursorProject install goes to .agents/skills/; add -g for ~/.cursor/skills/.
$ gh skill install thedaviddias/Front-End-Checklist const-let --agent cursorProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/thedaviddias/Front-End-Checklist.git skills-src && mkdir -p .cursor/skills && cp -r skills-src/skills/const-let .cursor/skills/const-let && 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 "const-let" agent skill from https://github.com/thedaviddias/Front-End-Checklist/tree/main/skills/const-let into .cursor/skills/const-let/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "const-let", 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/thedaviddias/Front-End-Checklist.git --path skills/const-let--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 thedaviddias/Front-End-Checklist --skill const-let -a gemini-cliProject install goes to .agents/skills/; add -g for ~/.gemini/skills/.
$ gh skill install thedaviddias/Front-End-Checklist const-let --agent gemini-cliProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/thedaviddias/Front-End-Checklist.git skills-src && mkdir -p .gemini/skills && cp -r skills-src/skills/const-let .gemini/skills/const-let && 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 "const-let" agent skill from https://github.com/thedaviddias/Front-End-Checklist/tree/main/skills/const-let into .gemini/skills/const-let/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "const-let", 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 thedaviddias/Front-End-Checklist const-letInstalls 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 thedaviddias/Front-End-Checklist --skill const-let -a github-copilotProject install goes to .agents/skills/; add -g for ~/.copilot/skills/.
$ git clone --depth 1 https://github.com/thedaviddias/Front-End-Checklist.git skills-src && mkdir -p .github/skills && cp -r skills-src/skills/const-let .github/skills/const-let && 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 "const-let" agent skill from https://github.com/thedaviddias/Front-End-Checklist/tree/main/skills/const-let into .github/skills/const-let/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "const-let", 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 thedaviddias/Front-End-Checklist --skill const-let -a opencodeOpenCode documents no install command of its own. Project install goes to .agents/skills/; add -g for ~/.config/opencode/skills/.
$ gh skill install thedaviddias/Front-End-Checklist const-let --agent opencodeProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/thedaviddias/Front-End-Checklist.git skills-src && mkdir -p .opencode/skills && cp -r skills-src/skills/const-let .opencode/skills/const-let && 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 "const-let" agent skill from https://github.com/thedaviddias/Front-End-Checklist/tree/main/skills/const-let into .opencode/skills/const-let/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "const-let", 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
const-let- GitHub stars
- 74k
- Token cost
- ~469 tokens
- SKILL.md length
- 209 words
- Files
- 2 (incl. references)
- Skills in repo
- 390
- Repo updated
- First seen
- Licence
- MIT
At a glance
A skill your agent uses when reviewing scripts, client components, bundles, or runtime behavior related to Prefer const and let over var.
- Reviewing scripts
- SKILL.md covers Quick Reference, Check, Fix and Explain, plus 1 more section
- Instructions only: no scripts, shell commands, URLs or credentials in SKILL.md
- Client components
What it does
Const Let is an agent skill from thedaviddias/Front-End-Checklist. Use when reviewing scripts, client components, bundles, or runtime behavior related to Prefer const and let over var. Inspect both source code and the browser execution path so fixes target the real bottleneck or bug.
Its SKILL.md is about 470 tokens, which your agent loads only when the skill is triggered. The skill folder holds 2 other files, including reference files (for example `references/rule.md`).
The repository describes itself as: 🗂 The essential checklist for modern web development, for humans and AI agents. The licence is MIT.
When your agent uses it
- Reviewing scripts
- Client components
- Runtime behavior related to Prefer const and let over var
Example prompts
- “/const-let”
What it can do on your machine
Read from SKILL.md and the folder at commit e8d14d0. 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
Links to these hosts (documentation or services it may open):
frontendchecklist.io
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
Const Let loads about 469 tokens when it runs, and up to ~1.1k if it reads all its reference files. Until then it costs about 57 tokens; SKILL.md has 209 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 thedaviddias/Front-End-Checklist at commit e8d14d0, republished under its MIT licence (© thedaviddias). 209 words, ~469 tokens.
Download SKILL.mdSave it as
.claude/skills/const-let/SKILL.md (or your agent's skills folder). This skill also uses 1 other file; get the full folder from GitHub.- name
- const-let
- description
- Use when reviewing scripts, client components, bundles, or runtime behavior related to Prefer const and let over var. Inspect both source code and the browser execution path so fixes target the real bottleneck or bug.
- metadata.category
- javascript
- metadata.priority
- high
- metadata.difficulty
- beginner
- metadata.estimatedTime
- 10
- metadata.source
- frontendchecklist.io
- metadata.url
- https://frontendchecklist.io/rules/javascript/const-let
Prefer const and let over var
var's function scope and hoisting behavior regularly causes bugs where variables are accessible outside the block they were declared in. const and let enforce block scope and make code intent clearer — const signals that a binding should not be reassigned, which helps readers understand data flow.
Quick Reference
- Use const for values that are never reassigned
- Use let when reassignment is needed
- Never use var — it has function scope and is hoisted, causing subtle bugs
- const does not mean immutable — objects and arrays declared with const can still be mutated
Check
Scan this JavaScript file for any use of var and flag every occurrence with line numbers.
Fix
Replace all var declarations with const or let as appropriate. Use const when the variable is never reassigned, let otherwise.
Explain
Explain why const and let are preferred over var, covering scope, hoisting, and temporal dead zone.
Code Review
Review scripts, client components, and browser execution paths related to Prefer const and let over var. Flag exact imports, event handlers, runtime side effects, or blocking operations that violate the rule, and state how the change should be verified in the browser.
For full implementation details, code examples, and framework-specific guidance,
see references/rule.md.
Rule page: https://frontendchecklist.io/rules/javascript/const-let
© thedaviddias, 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 skills/const-let of thedaviddias/Front-End-Checklist.
- SKILL.md
- references/rule.md
Open the folder on GitHubat commit e8d14d0
Compare with similar skills
Const Let 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 |
|---|---|---|---|---|---|---|
| Const Let this skillthedaviddias/Front-End-Checklist | 74k | — | ~469 | Automated safety check: Pass | MIT | |
| Triage Support Bundlenetdata/netdata | 81k | — | ~2.7k | Automated safety check: Pass | GPL-3.0 | |
| Analyzing Backend BundleTriliumNext/Trilium | 38k | — | ~2.6k | Automated safety check: Pass | AGPL-3.0 | |
| Next Bundle Optimizervercel/next.js | 143k | — | ~2.4k | Automated safety check: Pass | MIT | |
| Optimize Bundle Sizeelastic/kibana | 21k | — | ~794 | Automated safety check: Pass | Custom licence | |
| Production Bundle Auditkeybase/client | 9.3k | — | ~620 | Automated safety check: Pass | BSD-3-Clause |
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Questions about Const Let
What does Const Let do?
A skill your agent uses when reviewing scripts, client components, bundles, or runtime behavior related to Prefer const and let over var. Const Let is an agent skill from thedaviddias/Front-End-Checklist. Use when reviewing scripts, client components, bundles, or runtime behavior related to Prefer const and let over var.
When should I use Const Let?
Const Let fits situations like: reviewing scripts; client components; runtime behavior related to Prefer const and let over var.
How do I install Const Let in Claude Code?
Run `npx skills add thedaviddias/Front-End-Checklist --skill const-let -a claude-code`. Or copy the skill folder (skills/const-let in thedaviddias/Front-End-Checklist) into .claude/skills/const-let in your project. Claude Code loads it when a task matches its description.
How do I install Const Let in Codex?
Run `npx skills add thedaviddias/Front-End-Checklist --skill const-let -a codex`. Or copy the skill folder (skills/const-let in thedaviddias/Front-End-Checklist) into .agents/skills/const-let in your project. Codex loads it when a task matches its description.
Can I use Const Let 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 thedaviddias/Front-End-Checklist --skill const-let -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/const-let, .gemini/skills/const-let, .github/skills/const-let and .opencode/skills/const-let in your project.
What does Const Let need to run?
SKILL.md names no scripts, command-line tools or credentials: Const Let is instructions for the agent only.
Does Const Let access the network?
SKILL.md names 1 domain. As links in the text: frontendchecklist.io. This is read from the text; nothing was executed.
Is Const Let 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 Const Let use?
Const Let 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 Const Let use?
About 469 tokens (SKILL.md is roughly 1.9k 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 675 tokens, read only when the agent opens those files.
What are the alternatives to Const Let?
Skills that share tags, products or a category with Const Let: Triage Support Bundle (netdata/netdata, 81k stars), Analyzing Backend Bundle (TriliumNext/Trilium, 38k stars), Next Bundle Optimizer (vercel/next.js, 143k stars) and Optimize Bundle Size (elastic/kibana, 21k stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.
Who maintains Const Let?
thedaviddias (a GitHub user) maintains it in thedaviddias/Front-End-Checklist, which has 74,412 GitHub stars. The repository holds 390 skills in this directory. The repository was last updated on October 6, 2026.
Source: thedaviddias/Front-End-Checklist on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.