Hacker News Reader

Comment by xxyyzz3d | Hacker News Reader

  TypeScript now supports using ‘let’ and ‘const’ in addition
  to ‘var’. These currently require the ES6 output mode, but
  we’re are investigating relaxing this restriction in future
  versions.

Would be quite nice to be able to use 'let', and just use variable renaming to generate ES5 code with unique names in the case where scopes overlap. I guess it might be coming?

View on HN

Variable hygiene is not sufficient in loops - you have to make IIFE's for that. Then you have to account that the code inside that IIFE might be referring to the arguments object of the outer function, so you have to forward the outer arguments object to the IIFE as well. It's not impossible but the end result is somewhat gnarly.

You could probably use TS's ES6 output and pipe it into Traceur or 6to5 or something.

Reply on news.ycombinator.com