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Saves an OutputArtifact to a file with text content.

Exports a FileReferenceOutputArtifact to the output location. If the source is a directory, it is copied recursively.

Resolution order for disk-backed sources:

1. If FileReferenceOutputArtifact.symlink is set and the platform supports symbolic links, a link is created instead of copying.

2. Otherwise, if FileReferenceOutputArtifact.useChecksumInvalidation is enabled, a sibling .checksum file is maintained next to the output; the copy is skipped when the source's checksum matches the stored value. This avoids redundant I/O for large assets (fonts, third-party libraries) that rarely change between builds.

3. Otherwise, the source is copied unconditionally.

A virtual (non-disk-backed) source is materialized by reading it through its file system, without symlinking or checksum invalidation.

Saves an OutputResourceGroup to a directory which contains its nested files.