== should parse ==

function test(test) {
}

[expect]
function test(test) {
}

== should parse with type annotation ==

function test(test : string) {
}

[expect]
function test(test: string) {
}

== should parse when optional ==

function test(test ? : string) {
}

[expect]
function test(test?: string) {
}

== should convert escape sequencies in an identifier to the character ==
const \u0061 = "";

[expect]
const a = "";