pip install webassets

from webassets import Environment, Bundle

assets_env = Environment(
    directory='./static',
    url='/static')

common_js = Bundle(
    'js/common-1.js',
    'js/common-2.js',
    filters='jsmin',
    output='js/common.js')

assets_env.register('common_js', common_js)

print(assets_env['common_js'].urls())
# ['/static/js/common.js?207d589d']

assets_env.debug = True
print(assets_env['common_js'].urls())
# ['/static/js/common-1.js', '/static/js/common-2.js']

function foo1() {

}

function foo2() {

}

function foo1(){}
function foo2(){}