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A skill your agent uses when reviewing scripts, client components, bundles, or runtime behavior related to Avoid implicit type coercion.
MITAuto-check passed
Install Type Coercion
$ npx skills add thedaviddias/Front-End-Checklist --skill type-coercion -a claude-codeProject install by default; add -g for ~/.claude/skills/.
$ gh skill install thedaviddias/Front-End-Checklist type-coercion --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/type-coercion .claude/skills/type-coercion && 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 "type-coercion" agent skill from https://github.com/thedaviddias/Front-End-Checklist/tree/main/skills/type-coercion into .claude/skills/type-coercion/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "type-coercion", 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/type-coercionType 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 type-coercion -a codexProject install goes to .agents/skills/; add -g for ~/.codex/skills/.
$ gh skill install thedaviddias/Front-End-Checklist type-coercion --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/type-coercion .agents/skills/type-coercion && rm -rf skills-srcUse ~/.agents/skills/ instead of .agents/skills for a personal install.
Codex skills documentation · loads skills from .agents/skills/
Install the "type-coercion" agent skill from https://github.com/thedaviddias/Front-End-Checklist/tree/main/skills/type-coercion into .agents/skills/type-coercion/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "type-coercion", 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 type-coercion -a cursorProject install goes to .agents/skills/; add -g for ~/.cursor/skills/.
$ gh skill install thedaviddias/Front-End-Checklist type-coercion --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/type-coercion .cursor/skills/type-coercion && 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 "type-coercion" agent skill from https://github.com/thedaviddias/Front-End-Checklist/tree/main/skills/type-coercion into .cursor/skills/type-coercion/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "type-coercion", 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/type-coercion--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 type-coercion -a gemini-cliProject install goes to .agents/skills/; add -g for ~/.gemini/skills/.
$ gh skill install thedaviddias/Front-End-Checklist type-coercion --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/type-coercion .gemini/skills/type-coercion && 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 "type-coercion" agent skill from https://github.com/thedaviddias/Front-End-Checklist/tree/main/skills/type-coercion into .gemini/skills/type-coercion/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "type-coercion", 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 type-coercionInstalls 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 type-coercion -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/type-coercion .github/skills/type-coercion && 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 "type-coercion" agent skill from https://github.com/thedaviddias/Front-End-Checklist/tree/main/skills/type-coercion into .github/skills/type-coercion/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "type-coercion", 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 type-coercion -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 type-coercion --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/type-coercion .opencode/skills/type-coercion && 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 "type-coercion" agent skill from https://github.com/thedaviddias/Front-End-Checklist/tree/main/skills/type-coercion into .opencode/skills/type-coercion/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "type-coercion", 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
type-coercion- GitHub stars
- 74k
- Token cost
- ~493 tokens
- SKILL.md length
- 201 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 Avoid implicit type coercion.
- 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
Type Coercion is an agent skill from thedaviddias/Front-End-Checklist. Use when reviewing scripts, client components, bundles, or runtime behavior related to Avoid implicit type coercion. Inspect both source code and the browser execution path so fixes target the real bottleneck or bug.
Its SKILL.md is about 490 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 Avoid implicit type coercion
Example prompts
- “/type-coercion”
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
Type Coercion loads about 493 tokens when it runs, and up to ~1.5k if it reads all its reference files. Until then it costs about 58 tokens; SKILL.md has 201 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). 201 words, ~493 tokens.
Download SKILL.mdSave it as
.claude/skills/type-coercion/SKILL.md (or your agent's skills folder). This skill also uses 1 other file; get the full folder from GitHub.- name
- type-coercion
- description
- Use when reviewing scripts, client components, bundles, or runtime behavior related to Avoid implicit type coercion. Inspect both source code and the browser execution path so fixes target the real bottleneck or bug.
- metadata.category
- javascript
- metadata.priority
- medium
- metadata.difficulty
- beginner
- metadata.estimatedTime
- 15
- metadata.source
- frontendchecklist.io
- metadata.url
- https://frontendchecklist.io/rules/javascript/type-coercion
Avoid implicit type coercion
JavaScript's implicit type coercion produces results that look like bugs to anyone who doesn't know the exact coercion rules. == comparisons with mixed types silently convert values in ways that fail to catch genuine errors. Explicit conversions make code intent clear and catch real type mismatches at the point where they occur.
Quick Reference
- Always use === and !== instead of == and !=
- Convert types explicitly with Number(), String(), Boolean(), parseInt()
- Be careful with + operator — it concatenates strings but adds numbers
- Use Array.isArray() instead of typeof for array checks
Check
Find all uses of == and != (non-strict equality) in this file. Also look for implicit type conversions from + operator and other coercion traps.
Fix
Replace all == with === and != with !==. Add explicit type conversions where mixed types are intentionally compared.
Explain
Explain JavaScript's implicit type coercion rules, why == is problematic, and how to write safe type comparisons.
Code Review
Review scripts, client components, and browser execution paths related to Avoid implicit type coercion. 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/type-coercion
© 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/type-coercion of thedaviddias/Front-End-Checklist.
- SKILL.md
- references/rule.md
Open the folder on GitHubat commit e8d14d0
Compare with similar skills
Type Coercion 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 |
|---|---|---|---|---|---|---|
| Type Coercion this skillthedaviddias/Front-End-Checklist | 74k | — | ~493 | 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 Type Coercion
What does Type Coercion do?
A skill your agent uses when reviewing scripts, client components, bundles, or runtime behavior related to Avoid implicit type coercion. Type Coercion is an agent skill from thedaviddias/Front-End-Checklist. Use when reviewing scripts, client components, bundles, or runtime behavior related to Avoid implicit type coercion.
When should I use Type Coercion?
Type Coercion fits situations like: reviewing scripts; client components; runtime behavior related to Avoid implicit type coercion.
How do I install Type Coercion in Claude Code?
Run `npx skills add thedaviddias/Front-End-Checklist --skill type-coercion -a claude-code`. Or copy the skill folder (skills/type-coercion in thedaviddias/Front-End-Checklist) into .claude/skills/type-coercion in your project. Claude Code loads it when a task matches its description.
How do I install Type Coercion in Codex?
Run `npx skills add thedaviddias/Front-End-Checklist --skill type-coercion -a codex`. Or copy the skill folder (skills/type-coercion in thedaviddias/Front-End-Checklist) into .agents/skills/type-coercion in your project. Codex loads it when a task matches its description.
Can I use Type Coercion 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 type-coercion -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/type-coercion, .gemini/skills/type-coercion, .github/skills/type-coercion and .opencode/skills/type-coercion in your project.
What does Type Coercion need to run?
SKILL.md names no scripts, command-line tools or credentials: Type Coercion is instructions for the agent only.
Does Type Coercion 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 Type Coercion 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 Type Coercion use?
Type Coercion 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 Type Coercion use?
About 493 tokens (SKILL.md is roughly 2k 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 969 tokens, read only when the agent opens those files.
What are the alternatives to Type Coercion?
Skills that share tags, products or a category with Type Coercion: 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 Type Coercion?
thedaviddias (a GitHub user) maintains it in thedaviddias/Front-End-Checklist, which has 74,421 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.