Registry / data / polyfills-db

polyfills-db

library3.0.0jsnpmunverified

A database of browser polyfill features, version 3.0.0, released as needed. Provides structured metadata about which browsers support each feature and which modules/files implement it. Supports runtime JS polyfills, recast-based JS transpilation, and postcss-based CSS transpilation. Key differentiator: centralized polyfill data for multiple transpilation targets, manually maintained with community contributions. Release cadence: irregular, stable.

data

npm install polyfills-db

github ↗package ↗

INSTALL

IMPORT

SIG · POLYFILLS-DB

polyfills-db

datajavascriptv3.0.0

Install

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Import

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Disk

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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.

polyfills-db

✓ import polyfillsDB from 'polyfills-db'

✗ const polyfillsDB = require('polyfills-db')

Default import is supported. ESM-only since v3. CJS require() will not work.

data

✓ import { data } from 'polyfills-db'

✗ const { data } = require('polyfills-db')

Named export for the raw database object. ESM-only.

features

✓ import { features } from 'polyfills-db'

✗ import features from 'polyfills-db'

Named export, not default. List of feature keys.

browsers

✓ import { browsers } from 'polyfills-db'

Named export for browser support matrix.

Shows basic usage: import database, list features, and check browser support.

import polyfillsDB, { data, features, browsers } from 'polyfills-db'; // Log all feature keys console.log(features); // Check browser support for a feature const feature = 'es6-array-from'; if (data[feature]) { console.log(`Browsers supporting ${feature}:`, data[feature].browsers); } // List available browsers console.log('Browsers:', browsers); // The database is a plain object; iterate features for (const feat of features) { console.log(feat, data[feat].polyfills); }

Debug

Known issues

breakingpolyfills-db v3 is ESM-only; require() throws ERR_REQUIRE_ESM.

fix

Use import syntax or dynamic import().

affects: >=3.0

deprecatedThe data format changed in v3: previously flat arrays now nested objects.

fix

Update to access data[feature].browsers and data[feature].polyfills.

affects: >=3.0

gotchaThe 'regenerator' feature includes 'es7-async-fn'; do not use both or runtime duplication occurs.

fix

When using regenerator, omit es7-async-fn from polyfill list.

affects: *

gotchaManually maintained; browser support data may be outdated for recent browser versions.

fix

Cross-check with caniuse.com or MDN for latest data.

affects: *

deprecatedVersion 2.x used CJS; v3 drops CJS support entirely.

fix

Node.js v12+ supports ESM; add 'type':'module' to package.json.

affects: >=3.0

Errors

Common errors & fixes

Error [ERR_REQUIRE_ESM]: require() of ES Module /path/to/polyfills-db not supported.

Using require() with v3 ESM package.

fix

Switch to import: import polyfillsDB from 'polyfills-db'

TypeError: Cannot read property 'browsers' of undefined

Accessing data[feature] where feature key does not exist in the database.

fix

Check the feature exists in the features array before accessing data[feature].browsers.

SyntaxError: Unexpected token 'export'

Node.js version <12 without ESM support, or missing 'type':'module' in package.json.

fix

Update Node.js to >=12 and add 'type':'module' to your package.json.

Upgrade

Version history

3.0.0latest on npm

Audit

Dependencies

No dependency data recorded yet.

Agent activity

4 hits · last 30 days

node

Resources

githubhttps://github.com/polyfills/db ↗

packagehttps://www.npmjs.com/package/polyfills-db ↗