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Is tiny-invariant ESM-only? Can you require() it?

A tiny invariant function

Last verified Sep 9, 2026 against tiny-invariant@1.3.3. Markdown · JSON

Dual (CommonJS + ESM) Dual package — require() works on every Node.js version we test; import works too

tiny-invariant publishes both a CommonJS entry and a native ESM entry (ESM added in 1.3.0). require("tiny-invariant") works on every Node.js version we test (18, 20, 22, 24 and 26) and in Bun. import "tiny-invariant" works alongside it.

What to do

  1. Nothing to change. require("tiny-invariant") works on every Node.js version we test (18, 20, 22, 24 and 26) and in Bun. import * as tinyInvariant from "tiny-invariant" works alongside it; use named imports for what the ESM entry exports.
  2. TypeScript: types are bundled; install nothing extra.
Latest
1.3.3 (Feb 23, 2024)
Module format
Dual (CommonJS + ESM)
Last CommonJS version
1.3.3
Native ESM since
1.3.0
TypeScript types
Bundled
Node engines
not declared
Weekly downloads
72.9M
License
MIT

Does tiny-invariant@1.3.3 actually load? Runtime test results

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

Runtimerequire("tiny-invariant")import "tiny-invariant"
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 tiny-invariant

ES modules (import)

import * as tinyInvariant from "tiny-invariant";

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

CommonJS (require)

const tinyInvariant = require("tiny-invariant");

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 (16 versions; the newest 16 shown).

VersionsFormatFirst published
1.3.0 – 1.3.3Dual (CommonJS + ESM)Sep 28, 2022
0.0.1 – 1.2.0CommonJSApr 17, 2018

Frequently asked

Is tiny-invariant ESM-only?

tiny-invariant@1.3.3 ships CommonJS and ESM builds. tiny-invariant publishes both a CommonJS entry and a native ESM entry (ESM added in 1.3.0). require("tiny-invariant") works on every Node.js version we test (18, 20, 22, 24 and 26) and in Bun. import "tiny-invariant" works alongside it.

Can I require tiny-invariant?

Yes. tiny-invariant ships a CommonJS entry alongside the native ESM entry. require("tiny-invariant") works on every Node.js version we test (18, 20, 22, 24 and 26) and in Bun.

Does tiny-invariant work in Bun?

Yes. import "tiny-invariant" loaded successfully in Bun 1.4.0 on Sep 9, 2026.

Does tiny-invariant ship TypeScript types?

Yes. tiny-invariant bundles its own type declarations; no @types package is needed.

Links

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