How to resolve TypeError: Cannot convert "null" to int

Question

Error:

TypeError: Cannot convert "null" to int.

function play(connection, message){
                var server = servers[message.guild.id];

                server.dispatcher = connection.play(ytdl(server.queue[0], {filter: "audioonly"}));

                server.queue.shift();

                server.dispatcher.on("end", function(){
                    if(server.queue[0]){
                        play(connection, message);
                    }else {
                        connection.disconnect();
                    }
                })



            }           

The error message I'm getting from the tester is:

    TypeError: Cannot convert "null" to int
    TypeError: Cannot convert "null" to int
    Error: "abort(TypeError: Cannot convert "null" to int). Build with -s ASSERTIONS=1 for more info."
    at (anonymous) (file:///c:/Users/pc/Documents/Discord%20Bot/node_modules/opusscript/build/opusscript_native_wasm.js:8:1741) 
    at emit (events.js:311:19)

I'm begging you, please help me. Thanks.

Answer 1

I may have a solution for your problem!

UPDATE:

Following this answer and my bug report, prism-media released a fixed version. Thank you for such a quick solution! Keeping the text below just as a reference.

TL;DR

Find Opus.js in node_modules folder and go to line 55. You should see the following:

return this.encoder.encode(buffer, Opus.name === 'opusscript' ? null : this._options.frameSize);

CHANGE IT TO:

return this.encoder.encode(buffer, this._options.frameSize);

Then delete the same part at line 59.

Explanation

1. The exception is thrown in toWireType in opusscript_native_wasm.js which expects its second argument to be an int, but it gets a null. Hence, the exception.

2. Tracing it back, toWireType is called by OpusScriptHandler.encode for all its arguments.

3. Those four arguments come from OpusScript.prototype.encode in opusscript.js:69. The last argument causing the trouble (being null) is `frameSize.

4. The encode function is called from Opus.js:55 in prism-media which is a different module.

return this.encoder.encode(buffer, Opus.name === 'opusscript' ? null : this._options.frameSize);

There it is, the null causing all the trouble. So the exception is in fact not a fault of the opusscript package.

Long-term solutions

I reported the bug to the module owner, hopefully it gets fixed. Update: it has been fixed within a few hours! :)

Alternative solution

Using a custom loader should also work fine. It's still a hack, but more persistent :)