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Is @stencil/core ESM-only? Can you require() it?

A Compiler for Web Components and Progressive Web Apps

Last verified Sep 9, 2026 against @stencil/core@4.44.2. JSON

Dual (CommonJS + ESM) Dual package — both require() and import work

@stencil/core publishes both a CommonJS entry and a native ESM entry (ESM added in 4.19.0). require("@stencil/core") and import "@stencil/core" both work on every supported Node.js version and in Bun.

Latest
4.44.2 (Aug 26, 2026)
Module format
Dual (CommonJS + ESM)
Last CommonJS version
4.44.2
Native ESM since
4.19.0
TypeScript types
Bundled
Node engines
>=16.0.0
Weekly downloads
1.2M
License
MIT

Does @stencil/core@4.44.2 actually load? Runtime test results

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

Runtimerequire("@stencil/core")import "@stencil/core"
Node.js 18✓ works✗ failsSyntaxError
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 @stencil/core

ES modules (import)

import core from "@stencil/core";

CommonJS (require)

const core = require("@stencil/core");

Module format by version

Derived from the type, main and exports fields of every stable release on npm (385 versions; the newest 60 shown).

VersionsFormatFirst published
4.22.1 – 4.44.2Dual (CommonJS + ESM)Oct 9, 2024

Frequently asked

Is @stencil/core ESM-only?

@stencil/core@4.44.2 ships CommonJS and ESM builds. @stencil/core publishes both a CommonJS entry and a native ESM entry (ESM added in 4.19.0). require("@stencil/core") and import "@stencil/core" both work on every supported Node.js version and in Bun.

Can I require @stencil/core?

Yes. @stencil/core ships a CommonJS entry, so require("@stencil/core") works on every Node.js version, alongside the native ESM entry for import.

Does @stencil/core work in Bun?

Yes. import "@stencil/core" loaded successfully in Bun 1.4 on Sep 9, 2026.

Does @stencil/core ship TypeScript types?

Yes. @stencil/core bundles its own type declarations; no @types package is needed.

Links

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