[@types/webpack] Fix chunk type (#38535)
[@types/webpack] Fix chunk type (#38535)

* [@types/webpack] Fix chunk type

* Update index.d.ts

* Fix children in ToJsonOutput

markogresak/DefinitelyTyped,dsebastien/DefinitelyTyped,dsebastien/DefinitelyTyped,georgemarshall/DefinitelyTyped,georgemarshall/DefinitelyTyped,georgemarshall/DefinitelyTyped,georgemarshall/DefinitelyTyped,mcliment/DefinitelyTyped