.browserslistrc

# The default browser list (http://browserl.ist/?q=defaults)
# supports 89.79% of all browsers with 23 Babel transforms

# This list supports 88.35% of all browsers 
# while retaining ES6 syntax & only 6 Babel transforms
# (http://browserl.ist/?q=+%3E+0.05%25%2C+not+dead%2C+not+ie+11%2C+not+android+4.1%2C+not+android+4.2%2C+not+android+4.4%2C+not+android+4.4.3%2C+not+chrome+29%2C+not+chrome+43%2C+not+chrome+49%2C+not+chrome+54%2C+not+firefox+47%2C+not+firefox+48%2C+not+firefox+51%2C+not+firefox+52%2C+not+ios+8.1%2C+not+ios+9.3%2C+not+safari+5.1%2C+not+safari+9.1%2C)
# It produces smaller file size & takes advantage of ES6 syntax

> 0.05%
not dead
not ie 11
not android 4.1
not android 4.2
not android 4.4
not android 4.4.3
not chrome 29
not chrome 43
not chrome 49
not chrome 54
not firefox 47
not firefox 51
not firefox 48
not firefox 52
not ios 8.1
not ios 9.3
not safari 5.1
not safari 9.1