The original Dart language designers gave Dart Smalltalk semantics with JavaScript syntax. But Dart’s users rebelled and forced Dart to adopt a more compile-time-type-checked type system.
Some of the original Dart designers have developed a new language Toit that is Smalltalk-like: https://toit.io/company/about
Some of the original Dart designers have developed a new language Toit that is Smalltalk-like: https://toit.io/company/about