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Is scheduler ESM-only? Can you require() it?

Cooperative scheduler for the browser environment.

Last verified Sep 9, 2026 against scheduler@0.27.0. Markdown · JSON

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

scheduler ships CommonJS only. require("scheduler") works on every Node.js version we test (18, 20, 22, 24 and 26) and in Bun. import "scheduler" 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.

What to do

  1. require("scheduler") works on every Node.js version we test (18, 20, 22, 24 and 26) and in Bun.
  2. From ES modules use the default import: import scheduler from "scheduler"; then destructure. Named imports only work when Node.js can statically detect the exports.
  3. TypeScript: npm install -D @types/scheduler
Latest
0.27.0 (Oct 1, 2025)
Module format
CommonJS
Last CommonJS version
0.27.0
TypeScript types
@types/scheduler
Node engines
not declared
Weekly downloads
152.8M
License
MIT

Does scheduler@0.27.0 actually load? Runtime test results

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

Runtimerequire("scheduler")import "scheduler"
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 1.4.0✓ works✓ works

How to import scheduler

ES modules (import)

import scheduler from "scheduler";

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 scheduler = require("scheduler");

Module format by version

Derived from the type, main and exports fields of every stable release on npm, corrected where a runtime test of that version contradicted them (44 versions; the newest 44 shown).

VersionsFormatFirst published
0.1.0 – 0.27.0CommonJSJan 11, 2011

Frequently asked

Is scheduler ESM-only?

scheduler@0.27.0 is a CommonJS package. scheduler ships CommonJS only. require("scheduler") works on every Node.js version we test (18, 20, 22, 24 and 26) and in Bun. import "scheduler" 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 scheduler with ES module syntax?

Yes. import scheduler from "scheduler" 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 scheduler work in Bun?

Yes. import "scheduler" loaded successfully in Bun 1.4.0 on Sep 9, 2026.

Does scheduler ship TypeScript types?

Not bundled. Install the community types with "npm install -D @types/scheduler".

Links

Other commonjs packages

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