sp-dev-fx-webparts/samples/react-documents-detailslist/config/write-manifests.json

{
  "$schema": "https://dev.office.com/json-schemas/spfx-build/write-manifests.schema.json",
  //NOTE: the cdnBasePath works with relative path; this is useful when you move the pakedge between different environments (dev, staging, prod)
  "cdnBasePath": "/sites/dev03/Style Library/CDN"
}