JavaScript's massive success has nothing to do with the language and everything to do with the fact that its embedded in every web browser. There were no alternatives.
Ignoring compiling and polyfilling for older JS versions, Typescript is extremely popular. While it's compiled, all things beside the type system are from Javascript by design including syntax.
Probably of all people a lot of ruby acolytes do since a sizable portion of that community is a DHH personality cult. And plain JS is the 2nd best language ever made in that realm.