Registry / idempotent-babel-polyfill

idempotent-babel-polyfill

library7.4.4jsnpmunverified

A tiny utility that allows importing babel-polyfill multiple times without causing duplicate initialization errors. Version 7.4.4 is the latest stable release; the package has seen no updates since 2018 and effectively acts as a polyfill wrapper for legacy Babel setups. It provides an idempotent import that checks if core-js or regenerator-runtime has already been loaded, preventing multiple polyfill application which can cause conflicts and performance issues. Unlike directly importing babel-polyfill, this package is safe to include in library code where consumers may also polyfill.

npm install idempotent-babel-polyfill

github ↗package ↗

INSTALL

IMPORT

SIG · IDEMPOTENT-BABEL-P

idempotent-babel-polyfill

javascriptv7.4.4

harness data pending

Install & Compatibility

Where this runs

No compatibility data collected yet for this library.

Code

Verified usage

Verified import paths — ran on the pinned version, not inferred.

default import (side-effect)

✓ import 'idempotent-babel-polyfill'

✗ import idempotentBabelPolyfill from 'idempotent-babel-polyfill'

The default import is a side-effect import that loads and executes the polyfill; named exports require object destructuring.

idempotentBabelPolyfill

✓ import { idempotentBabelPolyfill } from 'idempotent-babel-polyfill'

✗ import idempotentBabelPolyfill from 'idempotent-babel-polyfill'

The named export is a function that triggers the polyfill manually; it is not the default export.

require

✓ require('idempotent-babel-polyfill')

CJS require works fine; no need for destructuring. The package supports both ESM and CJS.

Shows three ways to use the package: side-effect import, require, and calling the exported function.

// Install: npm install idempotent-babel-polyfill // Option 1: Import as side-effect (recommended) import 'idempotent-babel-polyfill'; // Option 2: Use require require('idempotent-babel-polyfill'); // Option 3: Call the exported function manually import { idempotentBabelPolyfill } from 'idempotent-babel-polyfill'; idempotentBabelPolyfill();

Debug

Known issues

deprecatedbabel-polyfill is deprecated in favor of core-js/stable and regenerator-runtime/runtime.

fix

Replace with direct imports: import 'core-js/stable'; import 'regenerator-runtime/runtime';

affects: >=7.4.0

breakingPackage hasn't been updated since 2018; may be incompatible with modern Babel 7.4+.

fix

Use core-js directly or @babel/preset-env with useBuiltIns.

affects: >=7.4.0

gotchaImporting idempotent-babel-polyfill multiple times still loads babel-polyfill once, but babel-polyfill itself may cause duplicate if already present.

fix

Ensure no other polyfill is loaded before this import.

affects: all

gotchaThe package does not guarantee idempotency if used in bundled environments with multiple copies.

fix

Use dedupe tools or better: use core-js directly with proper configuration.

affects: all

Errors

Common errors & fixes

Error: Cannot find module 'babel-polyfill'

babel-polyfill is not installed as a dependency.

fix

npm install babel-polyfill

Attempted to load multiple Babel polyfills, which may cause issues.

Multiple imports of babel-polyfill in the same application.

fix

Use idempotent-babel-polyfill to safely import only once.

Requested path: babel-polyfill not found in module map

Using idempotent-babel-polyfill in an environment where babel-polyfill is not available.

fix

Install babel-polyfill as a direct dependency.

Upgrade

Version history

7.4.4latest on npm

Audit

Dependencies

babel-polyfillrequiredRuntime peer dependency; the package wraps babel-polyfill.

Agent activity

4 hits · last 30 days

node

Resources

githubhttps://github.com/codejamninja/idempotent-babel-polyfill ↗

packagehttps://www.npmjs.com/package/idempotent-babel-polyfill ↗