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Is file-saver ESM-only? Can you require() it?

An HTML5 saveAs() FileSaver implementation

Last verified Sep 9, 2026 against file-saver@2.0.5. Markdown · JSON

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

file-saver ships CommonJS only. require("file-saver") works on every Node.js version we test (18, 20, 22, 24 and 26) and in Bun. import "file-saver" 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("file-saver") 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 fileSaver from "file-saver"; then destructure. Named imports only work when Node.js can statically detect the exports.
  3. TypeScript: npm install -D @types/file-saver
Latest
2.0.5 (Nov 19, 2020)
Module format
CommonJS
Last CommonJS version
2.0.5
TypeScript types
@types/file-saver
Node engines
not declared
Weekly downloads
5.0M
License
MIT

Does file-saver@2.0.5 actually load? Runtime test results

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

Runtimerequire("file-saver")import "file-saver"
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 file-saver

ES modules (import)

import fileSaver from "file-saver";

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 fileSaver = require("file-saver");

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 (14 versions; the newest 14 shown).

VersionsFormatFirst published
1.2.0 – 2.0.5CommonJSMay 25, 2016

Frequently asked

Is file-saver ESM-only?

file-saver@2.0.5 is a CommonJS package. file-saver ships CommonJS only. require("file-saver") works on every Node.js version we test (18, 20, 22, 24 and 26) and in Bun. import "file-saver" 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 file-saver with ES module syntax?

Yes. import fileSaver from "file-saver" 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 file-saver work in Bun?

Yes. import "file-saver" loaded successfully in Bun 1.4.0 on Sep 9, 2026.

Does file-saver ship TypeScript types?

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

Links

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