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Custom error message not working #2957
Description
Bug description
Using either:
class LocationOccupied extends Error {
constructor(message: string) {
super(`LocationOccupied(${message})`);
}
}OR
class LocationOccupied extends Error {
constructor(message: string) {
this.message = `LocationOccupied(${message})`;
}
}OR
class LocationOccupied extends Error {
toString(): string {
return `LocationOccupied(${this.message})`
}
}and calling this:
throw new LocationOccupied(`${x}-${y}`)I'm not getting a custom message:
› wasmer run build/release.wasm
⠁ Compiling to WebAssembly abort: 0-0 in assembly/world.ts(107:7)
› wasmtime run build/release.wasm
abort: 0-0 in assembly/world.ts(107:7)
Error: failed to run main module `build/release.wasm`
Notice only "0-0" is getting output, which is what is passed into the throw.
The change of the message in the custom error class doesn't apply.
Steps to reproduce
See above
AssemblyScript version
v0.28.9
Activity
CountBleck commentedon Oct 27, 2025
I suspect something like
throw (new LocationOccupied(...))would work, due to a quirk/optimization in howthrowstatements are compiled (most likely to avoid allocating an object just so the program can subsequently abort).