Print a console.error if koboldCallback is missing (#81)

maciejhirsz · Apr 28, 2023 · 1bd25ca · 1bd25ca
1 parent d4dde20
commit 1bd25ca
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diff --git a/crates/kobold/js/util.js b/crates/kobold/js/util.js
@@ -45,3 +45,10 @@ export function replaceClass(n,o,v) { n.classList.replace(o,v); }
 export function toggleClass(n,c,v) { n.classList.toggle(c,v); }
 
 export function makeEventHandler(c,f) { return (e) => koboldCallback(e,c,f); }
+export function checkEventHandler() { if (typeof koboldCallback !== "function") console.error(
+`Missing \`koboldCallback\` in global scope.
+Add the following to your Trunk.toml:
+
+[build]
+pattern_script = "<script type=\\"module\\">import init, { koboldCallback } from '{base}{js}';init('{base}{wasm}');window.koboldCallback = koboldCallback;</script>"
+`) }
diff --git a/crates/kobold/src/internal.rs b/crates/kobold/src/internal.rs
@@ -291,6 +291,9 @@ extern "C" {
 
     #[wasm_bindgen(js_name = "makeEventHandler")]
     pub(crate) fn make_event_handler(closure: *mut (), vcall: usize) -> JsValue;
+
+    #[wasm_bindgen(js_name = "checkEventHandler")]
+    pub(crate) fn check_event_handler();
 }
 
 #[cfg(test)]

diff --git a/crates/kobold/src/lib.rs b/crates/kobold/src/lib.rs
@@ -537,6 +537,9 @@ where
 pub fn start(view: impl View) {
     init_panic_hook();
 
+    #[cfg(debug_assertions)]
+    internal::check_event_handler();
+
     use std::mem::MaybeUninit;
     use std::pin::pin;