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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. Markdown · 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 with a plain require()-able CommonJS entry is 2.0.1, published May 3, 2026; it declares support for Node.js >= 10.

On Node.js 20.19+, 22.12+ and newer, require("@tootallnate/once") works with the latest version: Node.js loads synchronous ES modules through require(). Verified on Node.js 20, 22, 24 and 26. On Node.js 18, which has no require(esm), require("@tootallnate/once") fails with ERR_REQUIRE_ESM.

What to do

  1. On Node.js 20.19+, 22.12+ and newer, require("@tootallnate/once") works with the latest version: Node.js loads synchronous ES modules through require(). Verified on Node.js 20, 22, 24 and 26.
  2. From a CommonJS file, use a dynamic import inside an async function: const once = await import("@tootallnate/once"). That works on every Node.js version the package supports (>= 10).
  3. If you need a synchronous require() or run Node.js 18: npm install @tootallnate/once@2.0.1, the last CommonJS release (published May 3, 2026); it declares Node.js >= 10.
  4. TypeScript: types are bundled; install nothing extra.
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
Weekly downloads
35.7M
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 1.4.0✓ works✓ works

How to import @tootallnate/once

ES modules (import)

import * as once from "@tootallnate/once";

Namespace import shown because the ESM entry may have no default export; use named imports for what it exports.

CommonJS (require)

// Node.js 20.19+, 22.12+ and newer (verified):
const once = require("@tootallnate/once");

// Any Node.js version the package supports (>= 10), from an async function:
async function main() {
  const once = await import("@tootallnate/once");
}

// Or pin the last CommonJS release (declares Node.js >= 10):
// 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, corrected where a runtime test of that version contradicted them (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 with a plain require()-able CommonJS entry is 2.0.1, published May 3, 2026; it declares support for Node.js >= 10.

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

2.0.1 is the last version of @tootallnate/once with a CommonJS build; it declares Node.js >= 10. 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?

From a CommonJS file, use a dynamic import inside an async function: const once = await import("@tootallnate/once"). That works on every Node.js version the package supports (>= 10). On Node.js 20.19+, 22.12+ and newer, require("@tootallnate/once") works with the latest version: Node.js loads synchronous ES modules through require(). Verified on Node.js 20, 22, 24 and 26. Alternatively pin @tootallnate/once@2.0.1 (declares Node.js >= 10).

Does @tootallnate/once work in Bun?

Yes. import "@tootallnate/once" loaded successfully in Bun 1.4.0 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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