converting webpack config to rollup

[cfry]

I'm trying to include npm @techstark/opencv-js in my web app.
The github site for this package recommended this webpack config:
module.exports = {
resolve: {
modules: [...],
fallback: {
fs: false,
path: false,
crypto: false
}
}
};
But my app is using rollup and I don't know how to translate this into rollup config.
I have attempted to out at the top of my rollup.config file:
import nodePolyfills from 'rollup-plugin-node-polyfills'; errors during build
and in the plugins array include:
nodePolyfills()
but that errors
Help greatly appreciated.