Registry / web-framework / babel-preset-metal

babel-preset-metal

library4.1.0jsnpmunverified

A Babel preset for Metal.js projects that automatically registers components and transpiles ES2015 for IE9+ compatibility. Version 4.1.0 is the latest stable release, with maintenance updates as needed. Key differentiators: minimal configuration for Metal.js, includes all necessary transforms for the framework's component system. Alternatives like standard babel-preset-env require manual plugin setup.

web-framework

npm install babel-preset-metal

github ↗package ↗

INSTALL

IMPORT

SIG · BABEL-PRESET-METAL

babel-preset-metal

web-frameworkjavascriptv4.1.0

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

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

✗ import metal from 'babel-preset-metal'

Used as a Babel preset, not imported directly in code.

plugins

✓ import { plugins } from 'babel-preset-metal'

✗ const plugins = require('babel-preset-metal').plugins

Named export available in ES modules. CommonJS require may work but is discouraged in modern Babel configurations.

preset

✓ // In .babelrc: { "presets": ["metal"] }

✗ import preset from 'babel-preset-metal'

Preset should be referenced by string name in Babel config, not imported as a module.

Shows basic Babel configuration to transpile Metal.js components using the preset.

// .babelrc { "presets": ["metal"] } // Install npm install --save-dev babel-preset-metal@^4.0.0 // Example component import { Component } from 'metal-component'; import { Soy } from 'metal-soy'; class MyComponent extends Component { created() { this.name = 'Metal'; } } Soy.register(MyComponent, 'MyComponent'); export { MyComponent }; // Build with Babel npx babel src --out-dir build

Debug

Known issues

breakingThis preset may not be compatible with Babel 7+ as it depends on Babel 6 presets/plugins.

fix

Use @babel/preset-metal for Babel 7 or upgrade to Metal.js version that uses Babel 7.

affects: >=4.0.0

deprecatedbabel-preset-metal is deprecated in favor of @babel/preset-metal for Babel 7 compatibility.

fix

Use @babel/preset-metal instead: npm install --save-dev @babel/preset-metal

affects: >=4.0.0

gotchaThe preset includes plugins for ES2015 that may conflict with other presets (e.g., babel-preset-env) causing duplicate transforms.

fix

Avoid combining with other ES2015 presets; use babel-preset-env with 'useBuiltIns' or choose one preset.

affects: *

gotchaThe preset automatically adds the 'metal' plugin which registers components globally; this might cause issues with code splitting or lazy loading.

fix

For advanced bundling, manually configure the metal plugin with explicit registration.

affects: *

Errors

Common errors & fixes

Module build failed: Error: Couldn't find preset "metal" relative to directory

Missing babel-preset-metal package or incorrect Babel config path.

fix

Install with npm install --save-dev babel-preset-metal and ensure .babelrc is in project root.

Error: Plugin/Preset files are not allowed to export objects, only functions.

Mismatch between Babel version (Babel 7 expects functions, not objects).

fix

Upgrade to @babel/preset-metal or use Babel 6. Or configure with the standalone Babel package.

Upgrade

Version history

4.1.0latest on npm

Audit

Dependencies

No dependency data recorded yet.

Agent activity

10 hits · last 30 days

node

OpenAI (training)

Resources

githubhttps://github.com/metal/babel-preset-metal ↗

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