== should format ==
const o = {
    [   test

    ]: 5,
};

[expect]
const o = {
    [test]: 5,
};

== should make multi-line when inner node is on newline ==
const o = {
    [
        test]: 5
};

[expect]
const o = {
    [
        test
    ]: 5,
};

== should allow comments inside ==
const o = {
    [
        // testing
        test
    ]: 5,
};

[expect]
const o = {
    [
        // testing
        test
    ]: 5,
};