Replace writeReferencesToFile with writeClosure. Make writeClosure accept a list of paths instead of a path. Re-implement with JSON-based exportReferencesGraph interface provided by __structuredAttrs = true. Reword the documentation. Co-authored-by: Valentin Gagarin <valentin.gagarin@tweag.io> Co-authored-by: Robert Hensing <roberth@users.noreply.github.com> Co-authored-by: Someone Serge <sergei.kozlukov@aalto.fi>