TODO

[othree]

• Variable declaration
• Import
• Export
• Class field
• if/else
• for in
• for of
• Expression
• for
• try/catch
• switch
• switch discriminant
• new
• throw
• exps
• class mehods
• Default function parameter
• Array
• Object
• comma in array, object
• Computed property
• arrow function
• function
• Generator
• async
• call expression
• Method definition
• await
• Template string
• label
• yield, return
• Before/after function parameter parens
• Paren
• Padding before }, ], )
• Object shorthand
• Empty paren
• with

[othree]

arrow function
    [async] [params] => body

    => :: token before body
    params :: 
        if params.length
            if wrap by paren
                   token before params[0]
               else 
                   params[0]
        else
           token before `)` before `(` body
    async :: token before params

    test before params [async] [params]
    test before body   [params] => body


function
    [async] function [*] [id] [params] body

const a = () => {};
const b = arg => {};
const c = async (a, b) => {};
const d = async arg => {};

[othree]

https://github.com/eslint/espree/blob/6284e096ec0fd2e72bcc038609abea2bbc5020d2/lib/visitor-keys.js