Registry / testing / babel-plugin-coverage

babel-plugin-coverage

library1.0.0jsnpmunverified

A Babel 6.x plugin that instruments JavaScript code with Istanbul-compatible `__coverage__` variables for test coverage collection. v1.0.0 is the latest stable release. This fork of babel-plugin-__coverage__ adds istanbul-style ignore hints and alters statement counting for conditionals. It works with Karma and mocha/nyc without additional tooling. No ongoing development; exists as a legacy solution for projects stuck on Babel 6.

testing

npm install babel-plugin-coverage

github ↗package ↗

INSTALL

IMPORT

SIG · BABEL-PLUGIN-COVER

babel-plugin-coverage

testingjavascriptv1.0.0

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

✓ // No default import; use .babelrc config

✗ const coverage = require('babel-plugin-coverage')

This is a Babel plugin, not imported in user code. Configure in .babelrc under plugins.

plugin

✓ { "plugins": [ "coverage" ] }

✗ { "plugins": [ [ "babel-plugin-coverage", {} ] ] }

In .babelrc, use the short name 'coverage'. The full name also works but is unnecessary.

options

✓ { "plugins": [ [ "coverage", { "ignore": "test/" } ] ] }

✗ { "plugins": [ [ "babel-plugin-coverage", { "ignore": "test" } ] ] }

Options can include 'ignore' (glob pattern) or 'only' (glob pattern). Note: glob patterns should include trailing slash for directories.

Shows basic setup in .babelrc to enable coverage only during test environments.

// .babelrc { "env": { "test": { "plugins": [ "coverage" ] } } } // Install: npm install --save-dev babel-plugin-coverage // Then run tests with Karma + karma-coverage or mocha + nyc.

Debug

Known issues

breakingbabel-plugin-coverage only works with Babel 6.x. It is incompatible with Babel 7+.

fix

Use @babel/plugin-istanbul for Babel 7+.

affects: all

gotchaWhen using with NYC, you must configure NYC not to instrument your code via nyc.include.

fix

In package.json, set "nyc": { "include": [ "/" ] } or equivalent.

affects: all

gotchaThis plugin does not generate any coverage report. It only instruments code. You still need a coverage reporter (karma-coverage, nyc).

fix

Use karma-coverage or nyc to generate HTML/lcov reports.

affects: all

deprecatedThe original babel-plugin-__coverage__ and this fork are effectively in maintenance mode. No new features or updates.

fix

Consider migrating to @babel/plugin-istanbul for newer Babel versions and istanbul compatibility.

affects: all

Errors

Common errors & fixes

Couldn't find preset "env" relative to directory

Missing or misconfigured babel-preset-env in .babelrc

fix

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

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

Using a Babel 6 plugin with Babel 7+

fix

Use @babel/plugin-istanbul or downgrade to Babel 6.

EBADENGINE: Unsupported engine for babel-plugin-coverage@1.0.0

Node.js version incompatible; the package may require older Node

fix

Use Node.js >= 4.0 and <= 10.x (verify package.json engines if present).

Upgrade

Version history

1.0.0latest on npm

Audit

Dependencies

babel-corerequiredPeer dependency for Babel plugin API

Agent activity

17 hits · last 30 days

node

OpenAI (training)

Resources

githubhttps://github.com/yyx990803/babel-plugin-coverage ↗

packagehttps://www.npmjs.com/package/babel-plugin-coverage ↗