1{plugins, [rebar3_format]}.
2
3{format, [
4    {files, ["src/*.erl", "test/*.erl"]},
5    {formatter, default_formatter},
6    {options, #{
7                paper => 80,
8                ribbon => 70,
9                inline_attributes => {when_under, 1},
10                inline_items => {when_under, 4}
11               }}
12]}.