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Is resize-observer-polyfill ESM-only? Can you require() it?

A polyfill for the Resize Observer API

Last verified Sep 9, 2026 against resize-observer-polyfill@1.5.1. JSON

CommonJS CommonJS — require() works on every Node.js version

resize-observer-polyfill ships CommonJS only. require("resize-observer-polyfill") works everywhere. import "resize-observer-polyfill" also works because Node.js and Bun can import CommonJS from ES modules, but only the default export is guaranteed; named imports depend on Node's static analysis of the module.

It also declares a "module" field, so bundlers such as webpack, Vite and esbuild pick up an ESM build for tree-shaking.

Latest
1.5.1 (Dec 9, 2018)
Module format
CommonJS
Last CommonJS version
1.5.1
TypeScript types
Bundled
Node engines
not declared
Weekly downloads
12.7M
License
MIT

Does resize-observer-polyfill@1.5.1 actually load? Runtime test results

Installed and executed on Sep 9, 2026 with require("resize-observer-polyfill") from a CommonJS file and import "resize-observer-polyfill" from an ES module.

Runtimerequire("resize-observer-polyfill")import "resize-observer-polyfill"
Node.js 18✓ works✓ works
Node.js 20✓ works✓ works
Node.js 22✓ works✓ works
Node.js 24✓ works✓ works
Node.js 26✓ works✓ works
Bun 1.4✓ works✓ works

How to import resize-observer-polyfill

ES modules (import)

import resizeObserverPolyfill from "resize-observer-polyfill";

Named imports from a CommonJS package only work when Node.js can statically detect them. If a named import fails, use the default import and destructure.

CommonJS (require)

const resizeObserverPolyfill = require("resize-observer-polyfill");

Module format by version

Derived from the type, main and exports fields of every stable release on npm (17 versions; the newest 17 shown).

VersionsFormatFirst published
1.0.0 – 1.5.1CommonJSSep 12, 2016

Frequently asked

Is resize-observer-polyfill ESM-only?

resize-observer-polyfill@1.5.1 is a CommonJS package. resize-observer-polyfill ships CommonJS only. require("resize-observer-polyfill") works everywhere. import "resize-observer-polyfill" also works because Node.js and Bun can import CommonJS from ES modules, but only the default export is guaranteed; named imports depend on Node's static analysis of the module.

Can I import resize-observer-polyfill with ES module syntax?

Yes. import resizeObserverPolyfill from "resize-observer-polyfill" works in Node.js and Bun because they support importing CommonJS modules. Named imports work only when Node.js can statically detect the exports.

Does resize-observer-polyfill work in Bun?

Yes. import "resize-observer-polyfill" loaded successfully in Bun 1.4 on Sep 9, 2026.

Does resize-observer-polyfill ship TypeScript types?

Yes. resize-observer-polyfill bundles its own type declarations; no @types package is needed.

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