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Is readline-sync ESM-only? Can you require() it?

Synchronous Readline for interactively running to have a conversation with the user via a console(TTY).

Last verified Sep 9, 2026 against readline-sync@1.4.10. JSON

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

readline-sync ships CommonJS only. require("readline-sync") works everywhere. import "readline-sync" 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.

Latest
1.4.10 (Jul 27, 2019)
Module format
CommonJS
Last CommonJS version
1.4.10
TypeScript types
@types/readline-sync
Node engines
>= 0.8.0
Weekly downloads
3.1M
License
MIT

Does readline-sync@1.4.10 actually load? Runtime test results

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

Runtimerequire("readline-sync")import "readline-sync"
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✓ works✓ works

How to import readline-sync

ES modules (import)

import readlineSync from "readline-sync";

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 readlineSync = require("readline-sync");

Module format by version

Derived from the type, main and exports fields of every stable release on npm (65 versions; the newest 60 shown).

VersionsFormatFirst published
0.2.4 – 1.4.10CommonJSJun 28, 2014

Frequently asked

Is readline-sync ESM-only?

readline-sync@1.4.10 is a CommonJS package. readline-sync ships CommonJS only. require("readline-sync") works everywhere. import "readline-sync" 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 readline-sync with ES module syntax?

Yes. import readlineSync from "readline-sync" 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 readline-sync work in Bun?

Yes. import "readline-sync" loaded successfully in Bun 1.4 on Sep 9, 2026.

Does readline-sync ship TypeScript types?

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

Links

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