AssemblyScript/assemblyscript#2555 is the relevant PR, and it removes __instanceof entirely from the compiler.
A workaround could be renaming asdom's Object to, say, JSObject, and changing __finalize.ts like so:

import {releaseObject} from './imports'
import {JSObject} from './JSObject'

// @ts-ignore
@global
function __finalize(ptr: usize): void {
	if (changetype<Object>(ptr) instanceof JSObject) {
		releaseObject(ptr)
	}
}

This snippet takes advantage of AssemblyScript/assemblyscript#2559, where Object becomes the implicit base class. (This PR was created in response to ASON's breakage from the __instanceof removal.) The new code should have the same behavior as the old code, although the internals are different (switch-case vs. RTTI in memory).

Implementing this change would break users of asdom that use AS versions below v0.24, but not implementing a workaround would keep all AS versions at and above v0.23 broken. (It's not feasible to support v0.23.x, which has neither __instanceof nor Object.)

Cannot find name '__instanceof'. in the "assemblyscript": "^0.27.5", #6

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