AtomsPackageRepository

PackageRepository backed by a GitHub repository laid out as <name>/<version>/<files>, where every version directory is a package root and therefore holds its PackageManifest.FILE_NAME. Files under a name starting with PackageFile.INTERNAL_PREFIX (e.g. __tests) are repository-internal and skipped.

Each package directory is listed through the Git Trees API once per instance, on first use, so the cost grows with the packages a document uses rather than with the whole repository; files are then read from raw GitHub URLs. listPackages instead lists the whole repository in one request, since a catalog needs every package anyway, and reads one manifest per package: that of its latest version.

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