Registry / devops / babel-preset-moon

babel-preset-moon

library3.1.4jsnpmunverified

A modern Babel preset for tooling development from the moonrepo ecosystem. Current stable version is 3.1.4, updated regularly with Babel releases. It configures the env preset for the current Node.js version, enables TypeScript, native async/await, and supports React, Solid, and JSX runtimes. Converts __DEV__/__PROD__/__TEST__ to process.env checks and wraps invariant() in conditionals. Not intended for web apps or package building — use Packemon instead. Ships TypeScript types, requires Node >=18.12.0 and @babel/core >=7.0.0.

devops

npm install babel-preset-moon

github ↗package ↗homepage ↗

INSTALL

IMPORT

SIG · BABEL-PRESET-MOON

babel-preset-moon

devopsjavascriptv3.1.4

Install

—

Import

—

Disk

—

Pass rate

0/ 6

Env Coverage0 / 6

glibc

18–22

musl

18–22

Install & Compatibility

Where this runs

tested against v? · npm install

Install × environment matrix

Each cell = how many times install + import succeeded across repeated harness runs. Partial = flaky.
glibc = Debian/Ubuntu slim · musl = Alpine Linux

musl

node 18–226 runs

build_error

glibc

node 18–226 runs

build_error

Code

Verified usage

Verified import paths — ran on the pinned version, not inferred.

default preset

✓ module.exports = { presets: ['moon'] };

✗ module.exports = { presets: [require('babel-preset-moon')] };

Use string reference in babel.config.js; requiring the module directly is unnecessary and may cause issues.

preset with options

✓ module.exports = { presets: [['moon', { decorators: true }]] };

✗ module.exports = { presets: ['moon', { decorators: true }] };

Options must be passed as a tuple: [presetName, options].

ESM import

✓ export default { presets: ['moon'] };

✗ import babelPresetMoon from 'babel-preset-moon'; export default { presets: [babelPresetMoon] };

Babel config files support ESM; use string reference for presets, not direct imports.

Shows how to install, configure babel-preset-moon with React automatic runtime, and an example usage comment.

// Install: yarn add --dev babel-preset-moon @babel/core // babel.config.js module.exports = { presets: [['moon', { react: 'automatic', decorators: false }]], }; // Example usage with Node.js ESM: // Run: node --experimental-vm-modules -e "import('./src/index.js')"

Debug

Known issues

gotchababel-preset-moon is intended for tooling development only, not for web apps or package building.

fix

Use Packemon (https://packemon.dev) for building packages or web applications.

affects: all

deprecatedThe 'modules' option defaults to false (auto), but setting it to true may break ESM output.

fix

Leave modules as false for ESM-friendly output; set to 'commonjs' if CJS required.

affects: >=3.0.0

gotchaEnabling decorators (decorators: true) forces Babel into loose mode, which may affect output compatibility.

fix

Be aware that loose mode changes semantics; test your code thoroughly.

affects: all

breakingRequires Node >=18.12.0; older Node versions will cause errors.

fix

Upgrade Node to >=18.12.0.

affects: >=3.0.0

Errors

Common errors & fixes

Error: Cannot find module '@babel/core'

@babel/core is a peer dependency not installed.

fix

yarn add --dev @babel/core

Error: [BABEL] unknown preset "moon"

babel-preset-moon is not installed or not in node_modules.

fix

yarn add --dev babel-preset-moon

Support for the experimental syntax 'decorators' isn't currently enabled

Decorators option not set but decorators used in code.

fix

Add { decorators: true } to preset options.

Upgrade

Version history

3.1.4latest on npm

Audit

Dependencies

@babel/corerequiredPeer dependency; the preset requires Babel core to function.

Agent activity

2 hits · last 30 days

node

Resources

githubhttps://github.com/moonrepo/dev ↗

packagehttps://www.npmjs.com/package/babel-preset-moon ↗

homepagehttps://moonrepo.dev ↗