Annotations on field names are eaten by formatting.

[cristianoc]

 let make = ({name: @optional name}: props<_>) => name->Belt.Option.getWithDefault("")->React.string // 2

becomes

  let make = ({name}: props<_>) => name->Belt.Option.getWithDefault("")->React.string // 2

Also, the punned version gives a syntax error:

  let make = ({@optional name}: props<_>) => name->Belt.Option.getWithDefault("")->React.string // 2

This is also eaten by formatting:

let z = name => { name : @optional  name, x:3}

And this is a syntax error:

let z = name => { @optional name, x: 3}