deno_emit fails depending on whether or not a breakpoint is set.

[jespertheend]

Not sure if this is a Deno issue, or a deno_emit issue, but it seems like debugging shouldn't affect the code like this so I'm assuming this is an issue with Deno.

To reproduce:

• create emit.js

import {emit} from "https://deno.land/x/[email protected]/mod.ts";

const result = await emit(new URL("https://deno.land/[email protected]/path/mod.ts"));
console.log(result);

• Run deno run -A --unstable --inspect-brk emit.js
• Connect a debugger (I'm using vscode since Chrome DevTools can't place breakpoints on files that haven't been run yet)
• place a breakpoint at the console.log line.
• Resume the debugger.

Actual result
Uncaught (in promise) TypeError: WebAssembly.compile(): Argument 0 must be a buffer source

Expected result
The code runs without any errors.

Some things to note:

• removing the breakpoint seems to make the code run, but when the process is done it keeps hanging rather than exiting automatically.
• removing --inspect-brk make the code run like normal.
• Enabling 'break on caught/uncaught exceptions' doesn't actually pause the debugger when the promise rejects, though I think I've seen this happen before with promises so this might be intended.

[Benjamin-Dobell]

Same issue is reported over at denoland/vscode_deno#708 and I'm seeing the same when attempting to debug in IntelliJ. All good until the code transitions into some WASM, then we get the error above and execution terminates.

[frdel]

Having the same issue. deno_emit import fails with error Uncaught (in promise) TypeError: WebAssembly.compile(): Argument 0 must be a buffer source when launching in vs code. Is there still no cure for this?

[santidhammo]

The same thing appears to happen with the bundle function, and indeed using IntelliJ only occurs when debugging, if running without debugging the output appears to be alright, so it does appear to have to do with the --inspect-brk option.

[CalvinWilkinson]

I am also having the same issue when using emit() and bundle.

If I use the current default launch config shown below which uses --inspect-wait, I get the error

    "version": "0.2.0",
    "configurations": [
        {
            "request": "launch",
            "name": "Launch Program",
            "type": "node",
            "program": "${workspaceFolder}/main.ts",
            "cwd": "${workspaceFolder}",
            "runtimeExecutable": "C:\\Users\\kinso\\.deno\\bin\\deno.EXE",
            "runtimeArgs": [
                "run",
                "--inspect-wait",
                "--allow-all"
            ],
            "attachSimplePort": 9229
        }
    ]

But if I just execute the script using the deno CLI, everything works fine.