[question] async call in constructor

[Inve1951]

this is my first time trying to use await/promises

in a class constructor i put this:

if await new Promise (r) =>
  cache.get @url, (b) =>
    r b
    return
  return
then return

since that gave me error: Class constructor may not be async when compiling i tried to work around it by wrapping it with do =>:

do =>
  if await new Promise (r) =>
    cache.get @url, (b) =>
      r b
      return
    return
  then return

which throws at runtime with Uncaught SyntaxError: Unexpected token ( after async
i get the same result when adding a space after async

so my question is, what am i doing wrong?

[Inve1951]

just realized the electron environment i'm forced to deal with is based on chrome 53 and node 6.5 which didn't have asynch/await yet

[GeoffreyBooth]

ES2015 class constructors cannot be async.

[Inve1951]

see what the second snippet compiles to
if that's bad js should the compiler catch that too?
@GeoffreyBooth

[GeoffreyBooth]

Second snippet runs for me in Chrome, as long as cache is defined.

[Inve1951]

then i was right with the environment just being outdated, thanks