Loader __getArray, "unsupported align: -1"

[data-ux]

I'm following along the Loader documentation examples about reading arrays from AssemblyScript. While trying to implement the example exactly as in the documentation, calling __getArray produces the error "unsupported align: -1".

An minimal project reproducing the problem is here:
https://github.com/data-ux/unsupported-align

I have tried importing the loader both from node_modules and from jsdelivr with the same effects. I'm on Assemblyscript version 0.18.25

[MaxGraey]

Make sure you add exportRuntime: true to debug and release configs: https://github.com/data-ux/unsupported-align/blob/master/asconfig.json#L3. It described in NOTE section of Loader's documentation

[data-ux]

Thanks. I saw the note but somehow understood it as "Allocating objects [...] externally requires..." and thought that allocating objects on the AssemblyScript side would not need the exportRuntime: true flag.

It seems the relevant thing exportRuntime does in this case is adding the __rtti_base export to the module. The export is then used in the loader in getInfo(), getBase() and __instanceof(). I'm wondering if there is any valid case where calling these functions when __rtti_base == -1? Or could we just always throw Error(E_NOEXPORTRUNTIME) when the the value is -1 within these functions? It would be alot more helpful to get the error "Operation requires compiling with --exportRuntime" than "unsupported align: -1".