This file is indexed.

/usr/lib/R/site-library/tikzDevice/INDEX is in r-cran-tikzdevice 0.10-1-1.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below.

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anyMultibyteUTF8Characters
                        Check If a String Contains Multibyte UTF-8
                        characters
getLatexStrWidth        Obtain Font Metrics from LaTeX
gridToDevice            Convert grid coordinates to device coordinates
sanitizeTexString       Replace LaTeX Special Characters in a String
setTikzDefaults         Reset tikzDevice options to default values.
tikz                    TikZ Graphics Device
tikzAnnotate            Add Custom TikZ Code to an Active Device
tikzCompilerInfo        Print paths to TeX compilers.
tikzDevice-package      Support for native LaTeX output of R graphics