babelrc-rollup

library3.0.0jsnpmunverified

Builds a Babel configuration for rollup-plugin-babel by reading a .babelrc file. Current stable version is 3.0.0 (August 2016, no recent updates). It simplifies Rollup integration by automatically converting presets to Rollup-compatible versions (e.g., es2015 → es2015-rollup) and adding the external-helpers plugin. Unlike manual configuration, it reads .babelrc and handles preset option passing (array syntax) for Babel v6.13+. Key differentiator: removes manual setup for Rollup+Babel, but is largely superseded by Rollup's built-in Babel handling.

devops

npm install babelrc-rollup

github ↗package ↗

INSTALL

IMPORT

SIG · BABELRC-ROLLUP

babelrc-rollup

devopsjavascriptv3.0.0

Install

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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

✓ import babelrc from 'babelrc-rollup'

✗ const babelrc = require('babelrc-rollup')

Default export; CommonJS require works but ESM is idiomatic for Rollup configs.

babelrc()

✓ babelrc({ path: '.babelrc', addModuleOptions: true })

✗ babelrc({ path: './.babelrc' })

Path is relative to process.cwd() by default; do not include './' prefix.

babelrc with findRollupPresets

✓ babelrc({ findRollupPresets: true })

✗ babelrc({ findRollupPresets: true, addModuleOptions: true })

Older versions (pre-3.0.0) enabled this by default. v3+ requires explicit opt-in.

Shows how to import babelrc-rollup and pass its output to rollup-plugin-babel in a Rollup config.

// rollup.config.js import babelrc from 'babelrc-rollup'; import babel from 'rollup-plugin-babel'; export default { input: 'src/main.js', output: { file: 'dist/bundle.js', format: 'esm' }, plugins: [ babel(babelrc()) ] };

babelrc-rollup --version

Debug

Known issues

breakingv3.0.0: findRollupPresets default changed from true to false. If you relied on automatic -rollup preset resolution, you must explicitly set findRollupPresets: true.

fix

Add findRollupPresets: true to the options object passed to babelrc().

affects: >=2.0.0 <3.0.0

breakingv2.0.0: findRollupPresets scans all presets for a -rollup suffix, which may pick up unintended replacements.

fix

Explicitly set findRollupPresets to false if you want exact preset matching, or upgrade to v3.0.0+.

affects: 2.0.0

deprecatedThe package is effectively unmaintained since August 2016. Modern Rollup and Babel versions may not work correctly.

fix

Consider using @rollup/plugin-babel with manual babel config or @babel/preset-env's modules: false.

affects: >=0.0.0

gotchaaddModuleOptions defaults to true, which sets modules: false for all presets. This may conflict with presets that already define modules options.

fix

Explicitly set addModuleOptions: false if your presets handle modules themselves.

affects: >=0.0.0

gotchaaddExternalHelpersPlugin defaults to true, which adds the external-helpers plugin. If not used, helpers may be duplicated.

fix

Set addExternalHelpersPlugin: false only if you are sure you don't need it.

affects: >=0.0.0

Errors

Common errors & fixes

Error: Cannot find module 'babel-preset-es2015-rollup'

findRollupPresets enabled but the corresponding -rollup preset is not installed.

fix

Install the -rollup preset: npm install --save-dev babel-preset-es2015-rollup, or disable findRollupPresets.

Error: .babelrc file not found

The default path '.babelrc' does not exist or is not readable.

fix

Ensure a .babelrc file exists at the project root, or pass a custom path option to babelrc().

TypeError: babelrc is not a function

Wrong import style or version incompatibility (require instead of import or ES module mismatch).

fix

Use the default import: import babelrc from 'babelrc-rollup';

Upgrade

Version history

3.0.0latest on npm

Audit

Dependencies

rollup-plugin-babelrequiredCompanion plugin that applies the Babel config generated by babelrc-rollup

Agent activity

6 hits · last 30 days

node

Resources

githubhttps://github.com/eventualbuddha/babelrc-rollup ↗

packagehttps://www.npmjs.com/package/babelrc-rollup ↗