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Babel Config Validator
by
charlie-morrison
· GitHub ↗
· v1.0.0
· MIT-0
100
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0
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0
Active Installs
1
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Install in OpenClaw
/install babel-config-validator
Description
Validate Babel config files (babel.config.json, .babelrc, .babelrc.json, package.json#babel) for deprecated presets, plugin conflicts, ordering issues, and b...
README (SKILL.md)
Babel Config Validator
Validate babel.config.json, .babelrc, .babelrc.json, and package.json#babel for deprecated presets/plugins, conflicting transforms, ordering issues, and best practices. Supports text, JSON, and summary output formats with CI-friendly exit codes.
Commands
# Full validation (all 24+ rules)
python3 scripts/babel_config_validator.py validate babel.config.json
# Quick syntax-only check (structure rules only)
python3 scripts/babel_config_validator.py check .babelrc
# Explain config in human-readable form
python3 scripts/babel_config_validator.py explain babel.config.json
# Suggest improvements
python3 scripts/babel_config_validator.py suggest package.json
# JSON output (CI-friendly)
python3 scripts/babel_config_validator.py validate .babelrc --format json
# Summary only (pass/fail + counts)
python3 scripts/babel_config_validator.py validate .babelrc --format summary
# Strict mode (warnings become errors)
python3 scripts/babel_config_validator.py validate .babelrc --strict
Rules (24+)
| # | Category | Severity | Rule |
|---|---|---|---|
| S1 | Structure | Error | File not found or unreadable |
| S2 | Structure | Error | Empty config or no content |
| S3 | Structure | Warning | Both babel.config and .babelrc present (conflict) |
| S4 | Structure | Warning | Unknown top-level config keys |
| S5 | Structure | Error | Invalid JSON syntax |
| P1 | Presets | Error | Deprecated preset (es2015, es2016, es2017, latest, stage-*) |
| P2 | Presets | Warning | Preset ordering matters (@babel/preset-typescript before @babel/preset-env) |
| P3 | Presets | Warning | Duplicate presets |
| P4 | Presets | Error | Unknown/misspelled preset name |
| P5 | Presets | Warning | Missing @babel/preset-env (most configs need it) |
| L1 | Plugins | Error | Deprecated plugin (@babel/plugin-proposal-* → built-in) |
| L2 | Plugins | Warning | Duplicate plugins |
| L3 | Plugins | Warning | Plugin ordering conflict (decorators before class-properties) |
| L4 | Plugins | Warning | Conflicting plugins (transform-runtime + external-helpers) |
| L5 | Plugins | Warning | Plugin without @babel/ scope (may be community or typo) |
| M1 | Modules | Warning | modules: false in preset-env without bundler context |
| M2 | Modules | Warning | sourceType mismatch with modules setting |
| M3 | Modules | Warning | Conflicting module transforms |
| E1 | Env/Overrides | Warning | Empty env config section |
| E2 | Env/Overrides | Warning | Override without test pattern |
| E3 | Env/Overrides | Warning | Unknown env name (not development/production/test) |
| B1 | Best Practices | Warning | loose mode inconsistency across plugins |
| B2 | Best Practices | Warning | Missing targets/browserslist (unoptimized output) |
| B3 | Best Practices | Warning | useBuiltIns without corejs version |
| B4 | Best Practices | Warning | corejs version outdated (\x3C 3) |
Output Formats
text(default): Human-readable with colors and severity iconsjson: Machine-parseable JSON array of findingssummary: Pass/fail with error/warning counts
Exit Codes
0: No errors (warnings only or clean)1: One or more errors found2: File not found or invalid input
Requirements
- Python 3.8+
- No external dependencies (pure stdlib)
Usage Guidance
This skill appears safe and does what it claims: run the included Python script against Babel config files to get warnings/errors. Before running, ensure you execute it on projects you trust (it will read the target file and other Babel-related files in the same directory). No network calls, installs, or secret access are present, but if you need extra assurance you can open and review scripts/babel_config_validator.py yourself (it uses only the Python stdlib).
Capability Analysis
Type: OpenClaw Skill
Name: babel-config-validator
Version: 1.0.0
The babel-config-validator skill is a legitimate utility for auditing Babel transpiler configurations. The core logic in scripts/babel_config_validator.py uses only the Python standard library to parse and validate JSON/JSONC files for deprecated presets, plugin conflicts, and best practices. There are no indicators of data exfiltration, network activity, or malicious execution patterns, and the SKILL.md instructions are strictly aligned with the tool's stated purpose.
Capability Assessment
Purpose & Capability
Name/description match the included script and runtime instructions. The tool only reads and analyzes Babel config files and reports findings; it does not require unrelated credentials, binaries, or services.
Instruction Scope
SKILL.md instructs running the bundled Python script on local config files. The script only reads the specified file and looks for sibling config files in the same directory (expected for detecting config conflicts). It does not instruct broad data collection or transmission.
Install Mechanism
No install steps are declared and the code is pure Python stdlib. No downloads, package manager installs, or archive extraction are present in the manifest.
Credentials
The skill requests no environment variables, credentials, or config paths. The script reads files the user points it at and sibling files in the same directory—this is proportionate to a config linter.
Persistence & Privilege
Skill is not always-enabled and does not attempt to modify other skills or system configuration. It performs read-only analysis of local files and does not persist credentials or enable itself automatically.
How to Use
- Make sure OpenClaw is installed (local or Docker)
- Run the install command in chat:
/install babel-config-validator - After installation, invoke the skill by name or use
/babel-config-validator - Provide required inputs per the skill's parameter spec and get structured output
Version History
v1.0.0
Initial release: 24+ rules for babel.config.json, .babelrc, package.json#babel validation
Metadata
Frequently Asked Questions
What is Babel Config Validator?
Validate Babel config files (babel.config.json, .babelrc, .babelrc.json, package.json#babel) for deprecated presets, plugin conflicts, ordering issues, and b... It is an AI Agent Skill for Claude Code / OpenClaw, with 100 downloads so far.
How do I install Babel Config Validator?
Run "/install babel-config-validator" in the OpenClaw or Claude Code chat to install it in one step — no extra setup required.
Is Babel Config Validator free?
Yes, Babel Config Validator is completely free, licensed under MIT-0. You can download, install and use it at no cost.
Which platforms does Babel Config Validator support?
Babel Config Validator is cross-platform and runs anywhere OpenClaw / Claude Code is available (cross-platform).
Who created Babel Config Validator?
It is built and maintained by charlie-morrison (@charlie-morrison); the current version is v1.0.0.
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