Class MergedSignatureSource

The package that OWNS the class className -- an S3 class (a same-named constructor plus a registered method, see LibraryExports.s3Classes) or an S4 class (exported via exportClasses, see LibraryExports.s4Classes); S3 ownership wins a tie. undefined if none does. Without version, backed by a reverse index over every package's latest version, built once and cached.

release any held file handles

for a base package, the R versions it was part of core (ascending); undefined otherwise

declared dependencies (Depends/Imports/…) of a package version, with version qualifiers

the rich view of a single function by name, decoding only it (unlike functions, which decodes the whole package)

rich per-function view (signatures + call graphs) of a package version

whether the source can resolve the package at all

whether the source actually carries the given version of a package (not just the package itself)

whether the package is an R-core / base package (its versions are the R releases it shipped with)

whether a version is a current CRAN release (i.e. not in the package's noncran/removed set)

the newest version of a package by release date (falling back to the recorded latest)

the export view of a package version (defaults to its latest)

every package name this source can resolve

the release date of a package version (defaulting to the newest release), or undefined if unknown

every known release of a package (version + date), ascending by R-version order

the transitive callees of a function within one package version, expanding the stored local call graphs