egui_web: log panics using console.error

Cargo.lock

@@ -436,6 +436,16 @@ dependencies = [
  "memchr",
 ]
 
+[[package]]
+name = "console_error_panic_hook"
+version = "0.1.7"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "a06aeb73f470f66dcdbf7223caeebb85984942f22f1adb2a088cf9668146bbbc"
+dependencies = [
+ "cfg-if 1.0.0",
+ "wasm-bindgen",
+]
+
 [[package]]
 name = "copypasta"
 version = "0.7.1"
@@ -863,6 +873,7 @@ name = "egui_web"
 version = "0.16.0"
 dependencies = [
  "bytemuck",
+ "console_error_panic_hook",
  "egui",
  "egui_glow",
  "epi",
@@ -2597,9 +2608,9 @@ checksum = "fd6fbd9a79829dd1ad0cc20627bf1ed606756a7f77edff7b66b7064f9cb327c6"
 
 [[package]]
 name = "wasm-bindgen"
-version = "0.2.78"
+version = "0.2.79"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "632f73e236b219150ea279196e54e610f5dbafa5d61786303d4da54f84e47fce"
+checksum = "25f1af7423d8588a3d840681122e72e6a24ddbcb3f0ec385cac0d12d24256c06"
 dependencies = [
  "cfg-if 1.0.0",
  "wasm-bindgen-macro",
@@ -2607,9 +2618,9 @@ dependencies = [
 
 [[package]]
 name = "wasm-bindgen-backend"
-version = "0.2.78"
+version = "0.2.79"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "a317bf8f9fba2476b4b2c85ef4c4af8ff39c3c7f0cdfeed4f82c34a880aa837b"
+checksum = "8b21c0df030f5a177f3cba22e9bc4322695ec43e7257d865302900290bcdedca"
 dependencies = [
  "bumpalo",
  "lazy_static",
@@ -2634,9 +2645,9 @@ dependencies = [
 
 [[package]]
 name = "wasm-bindgen-macro"
-version = "0.2.78"
+version = "0.2.79"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "d56146e7c495528bf6587663bea13a8eb588d39b36b679d83972e1a2dbbdacf9"
+checksum = "2f4203d69e40a52ee523b2529a773d5ffc1dc0071801c87b3d270b471b80ed01"
 dependencies = [
  "quote",
  "wasm-bindgen-macro-support",
@@ -2644,9 +2655,9 @@ dependencies = [
 
 [[package]]
 name = "wasm-bindgen-macro-support"
-version = "0.2.78"
+version = "0.2.79"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "7803e0eea25835f8abdc585cd3021b3deb11543c6fe226dcd30b228857c5c5ab"
+checksum = "bfa8a30d46208db204854cadbb5d4baf5fcf8071ba5bf48190c3e59937962ebc"
 dependencies = [
  "proc-macro2",
  "quote",
@@ -2657,9 +2668,9 @@ dependencies = [
 
 [[package]]
 name = "wasm-bindgen-shared"
-version = "0.2.78"
+version = "0.2.79"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "0237232789cf037d5480773fe568aac745bfe2afbc11a863e97901780a6b47cc"
+checksum = "3d958d035c4438e28c70e4321a2911302f10135ce78a9c7834c0cab4123d06a2"
 
 [[package]]
 name = "wayland-client"

egui_web/CHANGELOG.md

@@ -7,8 +7,9 @@ All notable changes to the `egui_web` integration will be noted in this file.
 * The default painter is now glow instead of WebGL ([#1020](https://github.com/emilk/egui/pull/1020)).
 * Made the WebGL painter opt-in ([#1020](https://github.com/emilk/egui/pull/1020)).
 * Fixed glow failure on Chromium ([#1092](https://github.com/emilk/egui/pull/1092)).
-* Shift-scroll will now result in horizontal scrolling on all platforms ([#1136](https://github.com/emilk/egui/pull/1136)).
+* Shift-scroll will now result in horizontal scrolling ([#1136](https://github.com/emilk/egui/pull/1136)).
 * Updated `epi::IntegrationInfo::web_location_hash` on `hashchange` event ([#1140](https://github.com/emilk/egui/pull/1140)).
+* Panics will now be logged using `console.error`.
 
 
 ## 0.16.0 - 2021-12-29

egui_web/Cargo.toml

@@ -34,6 +34,7 @@ egui_glow = { version = "0.16.0",path = "../egui_glow", default-features = false
 epi = { version = "0.16.0", path = "../epi" }
 
 bytemuck = "1.7"
+console_error_panic_hook = "0.1.6"
 js-sys = "0.3"
 ron = { version = "0.7", optional = true }
 serde = { version = "1", optional = true }

egui_web/src/backend.rs

@@ -281,6 +281,9 @@ impl AppRunner {
 /// Install event listeners to register different input events
 /// and start running the given app.
 pub fn start(canvas_id: &str, app: Box<dyn epi::App>) -> Result<AppRunnerRef, JsValue> {
+    // Make sure panics are logged using `console.error`.
+    console_error_panic_hook::set_once();
+
     let mut runner = AppRunner::new(canvas_id, app)?;
     runner.warm_up()?;
     start_runner(runner)