public Optional<byte[]> getFileBytes(Path file) {
        return Optional.ofNullable(files.get(resolvePath(file)));
    }
Gets the bytes of a stored file.

@param file Relative or absolute path to the file to retrieve.
@return Returns the optionally found file by.es,
smithy-build/src/main/java/software/amazon/smithy/build/MockManifest.java