Is there a language very close to javascript converticle to asm.js? -

i have high interest javascript performance. , know asm.js can give serious boost matter.

asm.js can (indirectly) generated c/c++ code i'm way more used javascript. of course javascript cannot converted asm.js (imo: if mean conversion tool figured out mechanics browsers couldn't).

so there language close javascript wich can transformed/converted asm.js? (i guess typed one)

my goal here come asm.js code withouth having huge learning requirement.