Lykn

Error Handling

When compilation fails, the shim catches the error and reports it to the browser console:

lykn compile error (line 5, col 12):
  expected type keyword or destructuring pattern, got bare symbol 'x'
  in: (func add :args (x y) :body (+ x y))
                       ^
  Hint: all parameters require type annotations, e.g. (:number x :number y)

Compile errors include source location, the failing expression, and a hint when available. For pages with multiple <script type="text/lykn"> tags, the tag index is included.

Runtime errors — from the compiled JavaScript — appear as normal browser errors. Type check assertions from func and fn produce TypeError with the function name and expected type, same as compiled output from lykn compile.

Source maps are a future enhancement. Currently, the shim compensates by including the lykn source expression in compile error messages.