~~ arrowFunction.useParentheses: force ~~
== should force using parentheses ==
const obj1 = (a) => {};
const obj2 = a => 5;

[expect]
const obj1 = (a) => {};
const obj2 = (a) => 5;

== should also 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;
