How to build BOTH non-block components and blocks present in the /src directory using @wordpress/scripts

I’m pasting the answer I got from a developer in the Gutenberg repository.

Just add a webpack.config.js file at the root of your project with the following contents:

const defaultConfig = require( '@wordpress/scripts/config/webpack.config' );

module.exports = {
    ...defaultConfig,
    entry: {
        ...defaultConfig.entry(),
        index: './src/index.js',
    },
};

This will build all the blocks in /src/blocks/ folder and also compile the /src/index.js file.