wasm2js: import { getTempRet0 } from 'env';

Hi!

I am using the wasm2js tool on a WebAssembly module written in Rust using wasm-bindgen(no emscripten involved) to generate code that works on Internet Explorer. However, since I added a new library which internally makes use of i64, this import has been added to the wasm2js output:

import { getTempRet0 } from 'env';

From what I understand, this method is used by emscriptem to handle i64 variables. However, my project is not using emscriptem, and I haven't found a way to remove or pollyfill this import, so I get the error saying that env is not found.

Is there something I can do to fix this?

EDIT: This seems like a bug, since setTempRet0 is never imported or used anywhere and no 64 bits variable is taken as a parameter or returned by any exported method. Also, in my case, manually defining function getTempRet0() {return 0} instead of the import makes the module works correctly.

Start at the wasm2js entry point and reproduce the Rust wasm-bindgen case that emits import { getTempRet0 } from 'env';. Trace how i64 handling adds this import, then verify the generated output no longer contains an unused env dependency and add a regression test for the reported case.