/usr/share/javascript/proj4/lib/common/gN.js is in libjs-proj4 2.3.17+ds-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 | module.exports = function(a, e, sinphi) {
var temp = e * sinphi;
return a / Math.sqrt(1 - temp * temp);
};
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