WasmI16 constructor Null safety

1. Flutter
2. dart:wasm
3. WasmI16
4. WasmI16 constructor

WasmI16 class

1. Constructors
2. WasmI16
3. Properties
4. hashCode
5. runtimeType
6. Methods
7. noSuchMethod
8. toString
9. Operators
10. operator ==