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Is @rollup/plugin-alias ESM-only? Can you require() it?

Define and resolve aliases for bundle dependencies

Last verified Sep 9, 2026 against @rollup/plugin-alias@6.0.0. JSON

ESM-only ESM-only since 6.0.0 — last CommonJS version is 5.1.1

@rollup/plugin-alias dropped its CommonJS build in 6.0.0 (October 2025). The last version you can require() on every Node.js version, including 18 and older, is 5.1.1, published Sep 22, 2024.

require("@rollup/plugin-alias") failed in our probe on Node.js 20+ as well. See the runtime matrix below for the exact error.

@rollup/plugin-alias@6.0.0 declares engines ">=20.19.0", so Node.js 18 is outside its supported range regardless of module format.

Latest
6.0.0 (Oct 28, 2025)
Module format
ESM-only
Last CommonJS version
5.1.1
ESM-only since
6.0.0 (Oct 28, 2025)
TypeScript types
Bundled
Node engines
>=20.19.0
License
MIT

Does @rollup/plugin-alias@6.0.0 actually load? Runtime test results

Installed and executed on Sep 9, 2026 with require("@rollup/plugin-alias") from a CommonJS file and import "@rollup/plugin-alias" from an ES module.

Runtimerequire("@rollup/plugin-alias")import "@rollup/plugin-alias"
Node.js 18✗ failsERR_PACKAGE_PATH_NOT_EXPORTED✓ works
Node.js 20✗ failsERR_PACKAGE_PATH_NOT_EXPORTED✓ works
Node.js 22✗ failsERR_PACKAGE_PATH_NOT_EXPORTED✓ works
Node.js 24✗ failsERR_PACKAGE_PATH_NOT_EXPORTED✓ works
Node.js 26✗ failsERR_PACKAGE_PATH_NOT_EXPORTED✓ works
Bun 1.4✗ failserror: Cannot find module '@rollup/plugin-alias' from '/Users/boat/Projects/top-seo/data/probe-work/@rollup__plugin-alias/req.cjs'✓ works

How to import @rollup/plugin-alias

ES modules (import)

import pluginAlias from "@rollup/plugin-alias";

CommonJS (require)

// Node.js 20.19+ / 22.12+ / newer (package has no top-level await):
const pluginAlias = require("@rollup/plugin-alias");

// Any Node.js version:
const pluginAlias = await import("@rollup/plugin-alias");

// Or pin the last CommonJS release:
// npm install @rollup/plugin-alias@5.1.1

Module format by version

Derived from the type, main and exports fields of every stable release on npm (23 versions; the newest 23 shown).

VersionsFormatFirst published
6.0.0ESM-onlyOct 28, 2025
4.0.0 – 5.1.1Dual (CommonJS + ESM)Oct 7, 2022
2.2.0 – 3.1.9CommonJSOct 30, 2019

Frequently asked

Is @rollup/plugin-alias ESM-only?

@rollup/plugin-alias@6.0.0 is ESM-only. @rollup/plugin-alias dropped its CommonJS build in 6.0.0 (October 2025). The last version you can require() on every Node.js version, including 18 and older, is 5.1.1, published Sep 22, 2024.

Which version of @rollup/plugin-alias still supports CommonJS / require()?

5.1.1 is the last version of @rollup/plugin-alias with a CommonJS build. Install it with "npm install @rollup/plugin-alias@5.1.1". Every version from 6.0.0 on is ESM-only.

How do I use @rollup/plugin-alias from a CommonJS file?

Use a dynamic import: const mod = await import("@rollup/plugin-alias"). On Node.js 20.19+, 22.12+ and newer, a plain require("@rollup/plugin-alias") also works for ESM packages that do not use top-level await. Alternatively pin @rollup/plugin-alias@5.1.1.

Does @rollup/plugin-alias work in Bun?

Yes. import "@rollup/plugin-alias" loaded successfully in Bun 1.4 on Sep 9, 2026.

Does @rollup/plugin-alias ship TypeScript types?

Yes. @rollup/plugin-alias bundles its own type declarations; no @types package is needed.

Links

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