lab-babel

library1.1.1jsnpmunverified

A transform for the lab test framework that enables testing of ES6/JSX modules transpiled with Babel, including code coverage and proper source maps. Current version: 1.1.1 (stable, low activity). This package integrates with lab's -T option to automatically transpile .js, .jsx, .es, and .es6 files (excluding node_modules) using Babel, preserving source maps for accurate error line numbers. Key differentiator: legacy dependency on babel-core (>=4.x.x); not intended for Babel 6+ without manual preset configuration (babel-preset-es2015). Not actively maintained; consider modern alternatives like @babel/register or ts-node.

testing

npm install lab-babel

github ↗package ↗

INSTALL

IMPORT

SIG · LAB-BABEL

lab-babel

testingjavascriptv1.1.1

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.

lab-babel (transform)

✓ lab -T node_modules/lab-babel

✗ npm install --save-dev lab-babel && lab -T lab-babel (relative path missing)

Use the full path node_modules/lab-babel when specifying the -T option to lab. The package provides no JS exports; it's used as a CLI transform.

babel-core

✓ const babel = require('babel-core')

✗ import babel from '@babel/core' (wrong package name for babel-core)

lab-babel depends on babel-core >=4.x.x, not @babel/core. Use CommonJS require.

lab (test framework)

✓ const Lab = require('lab'); const lab = exports.lab = Lab.script()

✗ import { script } from 'lab' (lab is CJS, not ESM)

lab is a CommonJS module. The lab-babel transform does not change lab's API.

Install lab-babel with babel-core and es2015 preset, configure .babelrc, write a trivial ES6 test using arrow functions, and run with lab's transform option.

npm install --save-dev lab babel-core babel-preset-es2015 lab-babel echo '{"presets":["es2015"]}' > .babelrc # test file: test/example.js const Lab = require('lab'); const lab = exports.lab = Lab.script(); const Code = require('code'); lab.test('transpiled ES6', (done) => { const fn = (x) => x * 2; Code.expect(fn(5)).to.equal(10); done(); }); # run with: npx lab -T node_modules/lab-babel -t 100 -S

Debug

Known issues

deprecatedbabel-core is deprecated in favor of @babel/core (Babel 7+). lab-babel only works with babel-core >=4.x.x and <7.x.x. For Babel 7+, use @babel/register or lab's built-in transform.

fix

Use @babel/register: npm install --save-dev @babel/core @babel/register @babel/preset-env; lab -T node_modules/@babel/register

affects: >=1.0.0

gotchalab-babel requires babel-core as a peer dependency. If babel-core is not installed, lab will silently skip transpilation without error.

fix

Install babel-core: npm install --save-dev babel-core

affects: >=0.1.0

gotchaOnly modules outside node_modules with extensions .js, .jsx, .es, .es6 are transpiled. Files in node_modules or with other extensions are ignored.

fix

Ensure your test files are in the project root directory (not in node_modules) and use one of the supported extensions.

affects: >=0.1.0

deprecatedBabel 6 requires explicit preset configuration (e.g., babel-preset-es2015). Without .babelrc or package.json babel section, transpilation fails silently.

fix

Create a .babelrc file with: { "presets": ["es2015"] } or install and configure babel-preset-env.

affects: >=0.1.0

Errors

Common errors & fixes

Error: Cannot find module 'babel-core'

Missing peer dependency babel-core required by lab-babel.

fix

npm install --save-dev babel-core

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

Missing Babel preset when using Babel 6+.

fix

npm install --save-dev babel-preset-es2015 and ensure .babelrc or package.json babel field includes 'presets': ['es2015']

SyntaxError: Unexpected token import (or arrow functions) at runtime

lab-babel not applied because -T flag missing or incorrect path.

fix

Use: lab -T node_modules/lab-babel (full path). Ensure tests are .js, .jsx, .es, or .es6 files.

Upgrade

Version history

1.1.1latest on npm

Audit

Dependencies

No dependency data recorded yet.

Agent activity

2 hits · last 30 days

node

Resources

githubhttps://github.com/nlf/lab-babel ↗

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