== should format ==
function t([  a   ,   b  ]) {
}

[expect]
function t([a, b]) {
}

== should format with a type annotation ==
function t([  a   ,   b  ]: [string   , number]) {
}

[expect]
function t([a, b]: [string, number]) {
}

== should allow empty elements ==
[a, , b] = 0;

[expect]
[a, , b] = 0;
