export function getBrowser ( ) { if ( ( navigator . userAgent . indexOf ( 'Opera' ) || navigator . userAgent . indexOf ( 'OPR' ) ) != - 1 ) { return 'Opera' ; } else if ( navigator . userAgent . indexOf ( 'Chrome' ) != - 1 ) { return 'Chrome' ; } else if ( navigator . userAgent . indexOf ( 'Safari' ) != - 1 ) { return 'Safari' ; } else if ( navigator . userAgent . indexOf ( 'Firefox' ) != - 1 ) { return 'Firefox' ; } else if ( navigator . userAgent . indexOf ( 'MSIE' ) != - 1 || ! ! ( < any > document ) . documentMode == true ) { return 'IE' ; } else { return 'unknown' ; } }