Having something more akin to typescript's strict compilation might be more reasonable. You'd mark out older syntaxes/APIs as restricted or deprecated and comp

Having something more akin to typescript's strict compilation might be more reasonable. You'd mark out older syntaxes/APIs as restricted or deprecated and compilations would yield warnings or errors (when those features were used) depending on the compiler level. This would allow new projects to be developed using only the newer (standard) syntax, while allowing a transitional vector for older projects.