Issue with code loaded in a separate iFrame

I have a somewhat strange usage for Preact. I am the owner of a library ( GWTReact) that allows you to use React in Java via the Google GWT compiler. I am interested in also supporting Preact (with the react compat library). From my initial testing it basically works except for one case where arrays of child elements are passed. GWT loads the transpiled Java code in an iFrame which is different than the Preact script is loaded. The following line of code is the problem:

    function h(nodeName, attributes) {
    .
    .
    while (stack.length) if ((child = stack.pop()) instanceof Array)  ....... {

The problem is that instanceof doesn’t work if the array was created by code in the other iFrame. So I changed it to Array.isArray and it works fine

    function h(nodeName, attributes) {
    .
    .
    while (stack.length) if ((child = stack.pop()) && Array.isArray(child)) ....... {

[pstockley]

Great. Thanks a lot.

[developit]

@pstockley I’ve found a way to remove the Array constructor reliance in 8.0 😃