<@U33H6SB2B> when I use a property marked with Seskar's `JsValue`, I get a strange compiled result. ...

# javascript

[Edoardo Luppi]

@turansky when I use a property marked with Seskar's JsValue, I get a strange compiled result. E.g.;

val remainingBytes = bytes.slice(index + delimiterBytes.size)
socket.unshift(remainingBytes, BufferEncoding.binary)

Becomes:

var remainingBytes = bytes.slice(index + this_1.length | 0);
0;
this._this__u8e3s4__1.socket_1.unshift(remainingBytes, 'binary');

Note the 0;

When I use:

val remainingBytes = bytes.slice(index + delimiterBytes.size)
socket.unshift(remainingBytes, "binary".unsafeCast<BufferEncoding>())

It correctly compiles to:

var remainingBytes = bytes.slice(index + this_1.length | 0);
this._this__u8e3s4__1.socket_1.unshift(remainingBytes, 'binary');

Do you recognize if it is indeed a Seskar bug?

Other example:

0;
this.this$0__1.socket_1.once('close', closeHandler);
0;
this.this$0__1.socket_1.once('end', endHandler);
0;
this.this$0__1.socket_1.once('error', errorHandler);
0;
this.this$0__1.socket_1.on('readable', readableHandler);

[turansky]

> Do you recognize if it is indeed a Seskar bug?
It's feature 😉

[turansky]

0; is replacement for companion initialization

[turansky]

We have external interfaces with runtime and without.
For now we have no instruments to mark interfaces without runtime and we use @JsName("0") to avoid call errors.

cc @Artem Kobzar

[Edoardo Luppi]

Ahhhh! Thanks for the explanation, makes sense.
Yeah it's a nice trick, but would be cool to get it to work without it.

[Edoardo Luppi]

So basically in this case

sealed external interface ReadableEvent : node.events.EventType {
    sealed interface CLOSE : ReadableEvent
    ...

    companion object {
        @seskar.js.JsValue("close")
        val CLOSE: CLOSE

The 0 represents the companion object?