Registry / serialization / babel-plugin-transform-object-hasown

babel-plugin-transform-object-hasown

library1.1.0jsnpmunverified

Babel plugin for transforming Object.hasOwn() (ES2022 proposal) to a polyfill using Object.prototype.hasOwnProperty.call(). Current stable version: 1.1.0. Low release cadence, matches official polyfill behavior since v1.1.0. Key differentiator: targeted transform for the accessible Object.hasOwn proposal, only transforms exact 'Object.hasOwn' or 'Object["hasOwn"]' patterns.

serialization

npm install babel-plugin-transform-object-hasown

github ↗package ↗

INSTALL

IMPORT

SIG · BABEL-PLUGIN-TRANS

babel-plugin-transform-object-hasown

serializationjavascriptv1.1.0

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.

plugin

✓ module.exports = { plugins: ['babel-plugin-transform-object-hasown'] };

✗ module.exports = { plugins: ['transform-object-hasown'] };

Full npm package name required in .babelrc or babel.config.js.

Shows installation, Babel config setup, and code transformation of Object.hasOwn() to a polyfill.

// Install: npm install --save-dev babel-plugin-transform-object-hasown // .babelrc { "plugins": ["babel-plugin-transform-object-hasown"] } // Input const obj = {}; if (Object.hasOwn(obj, 'prop')) { console.log('has prop'); } // Output: object.hasOwn replaced with a helper that uses Object.prototype.hasOwnProperty.call

Debug

Known issues

gotchaOnly transforms exact patterns Object.hasOwn or Object['hasOwn'] — not Object['hasOwn']() with computed call or module aliases.

fix

Always use Object.hasOwn or Object['hasOwn'] in source code.

affects: >=1.0.0

gotchaUses a custom _objectHasOwn helper function; not a true runtime polyfill. The helper is defined per file, not shared.

fix

If you need a shared polyfill, consider using @babel/polyfill or core-js.

affects: >=1.0.0

gotchaPlugin does not check for existing runtime polyfill; if Object.hasOwn is already natively supported, transform still applies.

fix

Use with browserslist or @babel/preset-env to avoid unnecessary transforms.

affects: >=1.0.0

Errors

Common errors & fixes

ReferenceError: _objectHasOwn is not defined

Plugin not configured or plugin is not transforming the code (maybe source file not processed by Babel).

fix

Ensure the plugin is added to your Babel config and the file is processed by Babel.

TypeError: Cannot convert undefined or null to object

Plugin's custom helper throws this error exactly as Object.hasOwn would — it's intentional, but may surprise developers expecting silent false.

fix

Guard the call: if (obj != null && Object.hasOwn(obj, 'prop')) ...

Upgrade

Version history

1.1.0latest on npm

Audit

Dependencies

No dependency data recorded yet.

Agent activity

28 hits · last 30 days

node

OpenAI (training)

Resources

githubhttps://github.com/niksy/babel-plugin-transform-object-hasown ↗

packagehttps://www.npmjs.com/package/babel-plugin-transform-object-hasown ↗