Uncaught SyntaxError: Unexpected token ':' in webpack chunks mapping

I’m making a script by running $ wrangler publish.
it creates a script.js, but there is an error in it. it has a object in it like {
“vendors~BikesLandingPage”: “/js/vendors~BikesLandingPage.js”
}

When i upload this script this to workers, it gives an error. Uncaught SyntaxError: Unexpected token ‘:’.

How to resolve this?