/usr/share/javascript/proj4/lib/common/asinh.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(x) {
var s = (x >= 0 ? 1 : -1);
return s * (Math.log(Math.abs(x) + Math.sqrt(x * x + 1)));
};
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