Use gulp, make a preprocessor, stream results to tsc?
    Alternatively, use decorators to analyze valid javascript and inline it?
    Or maybe even write a typescript AST transformer? 
    
    simplest case: elementwise arithmetic and assignment.
    harder: reading/writing from buffers/arrays.
    harder: cross products, matrix multiplication
    harder: complex expression chains of non-elementwise operations with parens
  
    maybe implement static single assignemnt (SSA)? Eh I dunno, maybe not necessary?
    But I might still need some kind of representation of intermediate expression results that wasn't explicitly assigned to a symbol.
  
    This could be structured as 2 libraries: a struct-inlining algorithm, and a vectormath-specific one that depends on the first one.