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    /**     * convert time into another unit     */    function convert(val, sourceUnitName, destinationUnitName){        destinationUnitName = destinationUnitName || 'ms';        return (val * getUnit(sourceUnitName)) / getUnit(destinationUnitName);    }    //TODO: maybe extract to a separate module    function getUnit(unitName){        switch(unitName){            case 'ms':            case 'millisecond':                return 1;            case 's':            case 'second':                 return 1000;            case 'm':            case 'minute':                 return 60000;            case 'h':            case 'hour':                 return 3600000;            case 'd':            case 'day':                 return 86400000;            case 'w':            case 'week':                 return 604800000;            default:                throw new Error('"'+ unitName + '" is not a valid unit');        }    }    module.exports = convert;
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