Registry / babel-core

babel-core

library6.26.3jsnpmunverified

Babel compiler core version 6.26.3. This is an outdated version of Babel (pre-7.x). The current stable releases are v7.29.2 (2026-03-16) and v8.0.0-rc.3 (2026-03-16). babel-core v6 is no longer maintained and should not be used for new projects. Key differentiator vs v7/v8: v6 uses the `babel-core` package while v7+ uses `@babel/core`. It provides core transformation API including `transform`, `transformFile`, `transformFileSync`, and `transformFromAst` methods. Compatible with Node.js and browsers via bundlers. Does not include presets/plugins; those are separate packages.

npm install babel-core

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INSTALL

IMPORT

SIG · BABEL-CORE

babel-core

javascriptv6.26.3

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

✓ import babel from 'babel-core'

✗ const babel = require('babel-core')

Default import provides the main API object. CommonJS require works but ESM is preferred for bundlers.

transform

✓ import { transform } from 'babel-core'

✗ import transform from 'babel-core'

transform is a named export. Named export is available since v6.

transformFile

✓ import { transformFile } from 'babel-core'

Asynchronous transform of a file. Named export.

transformFileSync

✓ import { transformFileSync } from 'babel-core'

Synchronous version of transformFile.

transformFromAst

✓ import { transformFromAst } from 'babel-core'

Transform from an AST object.

Transforms ES6 arrow function to ES5 using babel-core transform API with env preset.

import { transform } from 'babel-core'; const code = 'const x = (a, b) => a + b;'; const result = transform(code, { presets: ['env'] // requires @babel/preset-env or babel-preset-env }); console.log(result.code); // Output: "var x = function x(a, b) { return a + b; };"

babel --version

Debug

Known issues

deprecatedbabel-core v6 is deprecated. Use @babel/core v7+ instead.

fix

Install @babel/core: npm install --save-dev @babel/core and update imports to use '@babel/core'.

affects: >=6.0.0 <7.0.0

gotchababel-core v6 does not include any presets. You must install presets separately (e.g., babel-preset-env) to transpile ES6+ code.

fix

Install presets: npm install --save-dev babel-preset-env and add 'presets: ["env"]' to options.

affects: >=6.0.0 <7.0.0

gotchaUser-local configuration files (.babelrc) are automatically loaded if babelrc option is not set to false. This may cause unexpected behavior.

fix

Set options.babelrc = false to ignore .babelrc files.

affects: >=6.0.0 <7.0.0

breakingIn babel-core v6, default options differ from v7 (e.g., 'ast' defaults to true). Be aware when migrating.

fix

Review Babel v7 migration guide for option changes.

affects: >=6.0.0 <7.0.0

Errors

Common errors & fixes

Error: Cannot find module 'babel-core'

babel-core not installed or moved to @babel/core in v7.

fix

Install babel-core v6: npm install --save-dev babel-core@6.26.3 or migrate to v7: npm install --save-dev @babel/core.

TypeError: babel.transform is not a function

Using default import incorrectly; transform is a named export.

fix

Use import { transform } from 'babel-core' or const transform = require('babel-core').transform.

Error: Requires Babel "7.0.0-0" but was loaded with "6.26.3"

Mixing babel-core v6 with plugins/presets designed for v7.

fix

Ensure all babel packages are of the same major version. For v6, use packages like babel-preset-env; for v7, use @babel/preset-env.

Upgrade

Version history

6.26.3latest on npm

Audit

Dependencies

No dependency data recorded yet.

Agent activity

13 hits · last 30 days

node

Resources

githubhttps://github.com/babel/babel ↗

packagehttps://www.npmjs.com/package/babel-core ↗

homepagehttps://babeljs.io ↗