one-double-zero

library1.1.1jsnpmunverified

One Double Zero is a code coverage tool focusing on relevance, accuracy, simplicity, flexibility, and speed. It offers a CLI tool named 'odz' that wraps any command to collect V8-based coverage data. As of version 1.1.1, it is actively maintained with frequent releases. Unlike other coverage tools like Istanbul or c8, One Double Zero aims for minimal configuration and high precision by leveraging native V8 coverage. It ships TypeScript types and supports both ESM and CommonJS.

testing

npm install one-double-zero

package ↗homepage ↗

INSTALL

IMPORT

SIG · ONE-DOUBLE-ZERO

one-double-zero

testingjavascriptv1.1.1

Install

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Import

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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 export

✓ import odz from 'one-double-zero'

✗ const odz = require('one-double-zero')

The package is ESM-only since v1. Use import syntax. No CommonJS require.

TypeScript types

✓ import type { CoverageResult } from 'one-double-zero'

✗ import { CoverageResult } from 'one-double-zero'

Types are exported but using value import will cause runtime error. Use 'import type' for TypeScript.

programmatic API

✓ import { runCoverage } from 'one-double-zero'

✗ const { runCoverage } = require('one-double-zero')

Named exports from ESM only. No default export for programmatic API.

Demonstrates CLI usage and programmatic API to collect V8 coverage data with include/exclude patterns.

// Install globally npm i -g one-double-zero // Run a command with coverage odz node my-test.js // Programmatic usage import { runCoverage } from 'one-double-zero'; const result = await runCoverage({ command: 'node', args: ['my-test.js'], include: ['src/**/*.js'], exclude: ['node_modules'] }); console.log(result.lines); // e.g., { covered: 80, total: 100 }

odz --version

Debug

Known issues

breakingv1.0.0 changed from CJS to ESM-only. require() will throw ERR_REQUIRE_ESM.

fix

Use import syntax or dynamic import().

affects: >=1.0.0

gotchaWhen using programmatic API, the 'include' pattern must be absolute or relative to process.cwd(). Relative paths without leading './' may not match.

fix

Use absolute paths or prefix relative paths with './'.

affects: all

deprecatedThe .odzrc config file format changed in v1.1.0. Old 'exclude' key renamed to 'coverageExclude'.

fix

Update config to use 'coverageExclude' instead of 'exclude'.

affects: >=1.1.0 <1.1.0

Errors

Common errors & fixes

Error [ERR_REQUIRE_ESM]: require() of ES Module not supported

Using CommonJS require() to load the ESM-only package.

fix

Change to import statement or use dynamic import().

TypeError: Cannot destructure property 'runCoverage' of 'undefined' or 'null'

Using destructuring from default import instead of named import.

fix

Use import { runCoverage } from 'one-double-zero' instead of import odz from 'one-double-zero' then destructure.

Error: ENOENT: no such file or directory, open 'coverage.json'

The output file path does not exist or the process lacks write permissions.

fix

Ensure the output directory exists or use an absolute path with existing directory.

Upgrade

Version history

1.1.1latest on npm

Audit

Dependencies

No dependency data recorded yet.

Agent activity

2 hits · last 30 days

node

Resources

packagehttps://www.npmjs.com/package/one-double-zero ↗

homepagehttps://one-double-zero.nightlycommit.com ↗