Javascript compilation broken

[scottkunkel]

Godot version:

85a3382

OS/device including version:

win 10

Issue description:

scons platform=javascript target=release_debug tools=no optimize=size use_lto=yes -j8

JS optimizer error:
Unexpected token: operator (>) (line: 1637, col: 160, pos: 61425)

================================

 function() { return Module.resizeCanvasOnStart },
 function($0) { stringToUTF8(Module.locale, $0, 16); },
 function($0, $1, $2, $3) { const send_notification = cwrap('send_notification', null, ['number']); const notifications = arguments; (['mouseover', 'mouseleave', 'focus', 'blur']).forEach(function(event, index) { Module.canvas.addEventListener(event, send_notification.bind(null, notifications[index])); }); const update_clipboard = cwrap('update_clipboard', null, ['string']); window.addEventListener('paste', function(evt) { update_clipboard(evt.clipboardData.getData('text')); }, true); },
 function($0) { window.alert(UTF8ToString($0)); },
 function($0) { document.title = UTF8ToString($0); },
 function($0) { var text = UTF8ToString($0); if (!navigator.clipboard || !navigator.clipboard.writeText) return 1; navigator.clipboard.writeText(text).catch(e => { console.error("Setting OS clipboard is only possible from an input callback for the HTML5 plafrom. Exception:", e); }); return 0; },
                                                                                                                                                                ^
================================

Steps to reproduce:
build with emscripten in win10

Minimal reproduction project:

[akien-mga]

Looks like a regression from #29298 @Faless.

[scottkunkel]

Looks like arrow functions are not supported here:
function(e){ instead of e => {
works

[Calinou]

@scottkunkel Which Emscripten version are you using?

According to emscripten-core/emscripten#7973, ES2015+ JavaScript should be supported in the Emscripten optimizer pass if the version you're using is recent enough (1.38.27 or later, according to the tag dates).

[scottkunkel]

1.38.25...
sigh will update and recompile

I think though if a new version is REQUIRED to compile, it needs to be reflected properly in the docs

[scottkunkel]

works with emscripten 1.38.31

[akien-mga]

Fixed by godotengine/godot-docs#2500.