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Is @tootallnate/once ESM-only? Can you require() it?

Creates a Promise that waits for a single event

Last verified Sep 9, 2026 against @tootallnate/once@3.0.1. JSON

ESM-only ESM-only since 3.0.0 — last CommonJS version is 2.0.1

@tootallnate/once dropped its CommonJS build in 3.0.0 (September 2021). The last version you can require() on every Node.js version, including 18 and older, is 2.0.1, published May 3, 2026.

On Node.js 20.19+, 22.12+ and every newer release, require("@tootallnate/once") works anyway: Node can load synchronous ES modules through require(). Verified on Node 20, 22, 24, 26. Node.js 18 and older still fail with ERR_REQUIRE_ESM.

Latest
3.0.1 (Feb 9, 2026)
Module format
ESM-only
Last CommonJS version
2.0.1
ESM-only since
3.0.0 (Sep 27, 2021)
TypeScript types
Bundled
Node engines
>= 10
License
MIT

Does @tootallnate/once@3.0.1 actually load? Runtime test results

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

Runtimerequire("@tootallnate/once")import "@tootallnate/once"
Node.js 18✗ failsERR_REQUIRE_ESM✓ 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 @tootallnate/once

ES modules (import)

import once from "@tootallnate/once";

CommonJS (require)

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

// Any Node.js version:
const once = await import("@tootallnate/once");

// Or pin the last CommonJS release:
// npm install @tootallnate/once@2.0.1

Module format by version

Derived from the type, main and exports fields of every stable release on npm (8 versions; the newest 8 shown).

VersionsFormatFirst published
3.0.0 – 3.0.1ESM-onlySep 27, 2021
1.0.0 – 2.0.1CommonJSFeb 8, 2020

Frequently asked

Is @tootallnate/once ESM-only?

@tootallnate/once@3.0.1 is ESM-only. @tootallnate/once dropped its CommonJS build in 3.0.0 (September 2021). The last version you can require() on every Node.js version, including 18 and older, is 2.0.1, published May 3, 2026.

Which version of @tootallnate/once still supports CommonJS / require()?

2.0.1 is the last version of @tootallnate/once with a CommonJS build. Install it with "npm install @tootallnate/once@2.0.1". Every version from 3.0.0 on is ESM-only.

How do I use @tootallnate/once from a CommonJS file?

Use a dynamic import: const mod = await import("@tootallnate/once"). On Node.js 20.19+, 22.12+ and newer, a plain require("@tootallnate/once") also works for ESM packages that do not use top-level await. Alternatively pin @tootallnate/once@2.0.1.

Does @tootallnate/once work in Bun?

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

Does @tootallnate/once ship TypeScript types?

Yes. @tootallnate/once bundles its own type declarations; no @types package is needed.

Links

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