use https://www.npmjs.com/package/@jridgewell/sourcemap-codec explaining the format: https://www.mattzeunert.com/2016/02/14/how-do-source-maps-work.html
use https://www.npmjs.com/package/@jridgewell/sourcemap-codec
explaining the format: https://www.mattzeunert.com/2016/02/14/how-do-source-maps-work.html