browserslist default values
If you use @babel/preset-env or simply browserslist by itself without configuration it falls back to the default configuration:
> 0.5%, last 2 versions, Firefox ESR, not dead
To see what this evaluates to you can run npx browserslist defaults, as of writing it evaluates to the following list:
and_chr 78
and_ff 68
and_qq 1.2
and_uc 12.12
android 76
baidu 7.12
chrome 78
chrome 77
chrome 76
chrome 49
edge 18
edge 17
firefox 70
firefox 69
firefox 68
ie 11
ie_mob 11
ios_saf 13.2
ios_saf 13.0-13.1
ios_saf 12.2-12.4
kaios 2.5
op_mini all
op_mob 46
opera 64
opera 63
safari 13
safari 12.1
safari 5.1
samsung 10.1
samsung 9.2