How to set the debundle.config.json

I download the code,
file "debundle.config.json"
{
  "type": "webpack",
  "entryPoint": 8,
  "knownPaths": {
    "8": "./index",
    "4": "./foo",
    "0": "uuid"
  }
}

when  just   index.js   foo.js  in   /src directory

Num 8  4 0 are just random  ID?

Can you give me some example? The DOCS.md file   confused me.


