Question: Rollup configuration with ESM

[kishor82]

Describe the issue

I'm currently setting up Rollup with a configuration similar to Axios, where the package.json specifies "type": "module". During the build process, I encountered the following issue:

> rollup -c -m

[!] RollupError: Node tried to load your configuration as an ES module even though it is likely CommonJS. To resolve this, change the extension of your configuration to ".cjs" or pass the "--bundleConfigAsCjs" flag.

Original error: require is not defined in ES module scope, you can use import instead
This file is being treated as an ES module because it has a '.js' file extension and '/Users/kishorrathva/Workspace/dev/flatten-this-json/package.json' contains "type": "module". To treat it as a CommonJS script, rename it to use the '.cjs' file extension.

The problem is occurring on this line in rollup.config.js:

const lib = require("./package.json");

The solution is to use import instead of require. I'm curious how the build is working for Axios with a similar setup.

Thanks for your help!

Example Code

No response

Expected behavior

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Axios Version

1.6.0

Adapter Version

No response

Browser

No response

Browser Version

No response

Node.js Version

v20.9.0

OS

OSX 14.4.1

Additional Library Versions

rollup  ^4.15.0

Additional context/Screenshots

No response