sheetjs/demos/rollup/README.md

Rollup

This library presents itself as a CommonJS library, so some configuration is required. The examples at https://rollupjs.org can be followed pretty much in verbatim. This sample demonstrates a rollup for browser as well as for node.

Required Plugins

The rollup-plugin-node-resolve and rollup-plugin-commonjs plugins are used:

import resolve from 'rollup-plugin-node-resolve';
import commonjs from 'rollup-plugin-commonjs';
export default {
	/* ... */
	plugins: [
		resolve({
			module: false, // <-- this library is not an ES6 module
			browser: true, // <-- suppress node-specific features
		}),
		commonjs()
	],
	/* ... */
};