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- var $ = require('../internals/export');
- var log1p = require('../internals/math-log1p');
- // eslint-disable-next-line es-x/no-math-acosh -- required for testing
- var $acosh = Math.acosh;
- var log = Math.log;
- var sqrt = Math.sqrt;
- var LN2 = Math.LN2;
- var FORCED = !$acosh
- // V8 bug: https://code.google.com/p/v8/issues/detail?id=3509
- || Math.floor($acosh(Number.MAX_VALUE)) != 710
- // Tor Browser bug: Math.acosh(Infinity) -> NaN
- || $acosh(Infinity) != Infinity;
- // `Math.acosh` method
- // https://tc39.es/ecma262/#sec-math.acosh
- $({ target: 'Math', stat: true, forced: FORCED }, {
- acosh: function acosh(x) {
- return (x = +x) < 1 ? NaN : x > 94906265.62425156
- ? log(x) + LN2
- : log1p(x - 1 + sqrt(x - 1) * sqrt(x + 1));
- }
- });
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