Semicolon before arrow IIFE

[rkurbatov]

Prettier Version: 1.6.1 / master

Code

(playground)

(async () => {})()

Actual behavior:

Semicolon is added before IIFE if --no-semi param is used. Is it required here?

;(async () => {})()

[ikatyang]

Hi, thanks for the issue. That semicolon is not required there, but it's the most consistent way to print with --no-semi, the rules that prettier followed to prevent problems from ASI (Automatic Semicolon Insertion) can be found in #1129 (comment):

Prefix ExpressionStatements with a semicolon when they "start with" one of the following:

• Array, +Unary, -Unary, Template String, JSXElement, Regex
• Any expression wrapped in parens

And there's also related discussions in #12.