~~ arrowFunction.useParentheses: maintain ~~
== should allow arrow functions without parens ==
const t = a => 5;

[expect]
const t = a => 5;

== should use parens when specified ==
const t = (a) => 5;

[expect]
const t = (a) => 5;

== should use parens when has a type ==
const t = (a: string) => 5;

[expect]
const t = (a: string) => 5;

== should maintain when has an async keyword ==
const t = async (a) => 5;
const u = async a => 5;

[expect]
const t = async (a) => 5;
const u = async a => 5;
