var s = 1000; 
var m = s * 60; 
var h = m * 60; 
var d = h * 24; 
var w = d * 7; 
var y = d * 365.25; 
module.exports = function (val, options){ 
options = options || { 
}
; 
var type = typeof val; 
if (type === 'string' && _AN_Read_length('length', val) > 0) { 
return parse(val); 
} 
 else if (type === 'number' && isFinite(val)) { 
return options["long"] ? fmtLong(val): fmtShort(val); 
} 
throw new Error('val is not a non-empty string or a valid number. val=' + JSON.stringify(val))
} 
; 
function parse(str){ 
str = String(str); 
if (_AN_Read_length('length', str) > 100) { 
return ; 
} 
var match = /^(-?(?:\d+)?\.?\d+) *(milliseconds?|msecs?|ms|seconds?|secs?|s|minutes?|mins?|m|hours?|hrs?|h|days?|d|weeks?|w|years?|yrs?|y)?$/i.exec(str); 
if (!match) { 
return ; 
} 
var n = parseFloat(match[1]); 
var type = (match[2] || 'ms').toLowerCase(); 
switch (type){ 
case 'years': case 'year': case 'yrs': case 'yr': case 'y': return n * y; 
case 'weeks': case 'week': case 'w': return n * w; 
case 'days': case 'day': case 'd': return n * d; 
case 'hours': case 'hour': case 'hrs': case 'hr': case 'h': return n * h; 
case 'minutes': case 'minute': case 'mins': case 'min': case 'm': return n * m; 
case 'seconds': case 'second': case 'secs': case 'sec': case 's': return n * s; 
case 'milliseconds': case 'millisecond': case 'msecs': case 'msec': case 'ms': return n; 
default : { 
return undefined; 
} 
} 
} 
function fmtShort(ms){ 
var msAbs = Math.abs(ms); 
if (msAbs >= d) { 
return Math.round(ms / d) + 'd'; 
} 
if (msAbs >= h) { 
return Math.round(ms / h) + 'h'; 
} 
if (msAbs >= m) { 
return Math.round(ms / m) + 'm'; 
} 
if (msAbs >= s) { 
return Math.round(ms / s) + 's'; 
} 
return ms + 'ms'; 
} 
function fmtLong(ms){ 
var msAbs = Math.abs(ms); 
if (msAbs >= d) { 
return plural(ms, msAbs, d, 'day'); 
} 
if (msAbs >= h) { 
return plural(ms, msAbs, h, 'hour'); 
} 
if (msAbs >= m) { 
return plural(ms, msAbs, m, 'minute'); 
} 
if (msAbs >= s) { 
return plural(ms, msAbs, s, 'second'); 
} 
return ms + ' ms'; 
} 
function plural(ms, msAbs, n, name){ 
var isPlural = msAbs >= n * 1.5; 
return Math.round(ms / n) + ' ' + name + (isPlural? 's': ''); 
}