This file is indexed.

/usr/share/javascript/codemirror/mode/diff/diff.js is in libjs-codemirror 2.23-1.

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

The actual contents of the file can be viewed below.

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CodeMirror.defineMode("diff", function() {
  return {
    token: function(stream) {
      var ch = stream.next();
      stream.skipToEnd();
      if (ch == "+") return "plus";
      if (ch == "-") return "minus";
      if (ch == "@") return "rangeinfo";
    }
  };
});

CodeMirror.defineMIME("text/x-diff", "diff");