Adjust platform init on Wasm to avoid tokio environment

The multi-threaded tokio environment does not work in Wasm.
console_error_panic_hook turns rust panics into JS console statements

Cargo.lock

@@ -877,6 +877,16 @@ dependencies = [
  "windows-sys 0.52.0",
 ]
 
+[[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",
+ "wasm-bindgen",
+]
+
 [[package]]
 name = "const-oid"
 version = "0.9.6"
@@ -3094,6 +3104,7 @@ dependencies = [
  "anyhow",
  "as_variant",
  "async-compat",
+ "console_error_panic_hook",
  "extension-trait",
  "eyeball-im",
  "futures-util",

bindings/matrix-sdk-ffi/Cargo.toml

@@ -80,6 +80,7 @@ uuid = { version = "1.4.1", features = ["v4"] }
 zeroize.workspace = true
 
 [target.'cfg(target_family = "wasm")'.dependencies]
+console_error_panic_hook = "0.1.7"
 tokio = { workspace = true, features = ["sync", "macros"] }
 uniffi.workspace = true
 

bindings/matrix-sdk-ffi/src/platform.rs

@@ -526,15 +526,22 @@ pub fn init_platform(
     config: TracingConfiguration,
     use_lightweight_tokio_runtime: bool,
 ) -> Result<(), ClientError> {
-    LOGGING.set(config.build()).map_err(|_| ClientError::Generic {
-        msg: "logger already initialized".to_owned(),
-        details: None,
-    })?;
+    #[cfg(all(feature = "js", target_family = "wasm"))]
+    {
+        console_error_panic_hook::set_once();
+    }
+    #[cfg(not(target_family = "wasm"))]
+    {
+        LOGGING.set(config.build()).map_err(|_| ClientError::Generic {
+            msg: "logger already initialized".to_owned(),
+            details: None,
+        })?;
 
-    if use_lightweight_tokio_runtime {
-        setup_lightweight_tokio_runtime();
-    } else {
-        setup_multithreaded_tokio_runtime();
+        if use_lightweight_tokio_runtime {
+            setup_lightweight_tokio_runtime();
+        } else {
+            setup_multithreaded_tokio_runtime();
+        }
     }
 
     Ok(())
@@ -557,6 +564,7 @@ pub fn enable_sentry_logging(enabled: bool) {
     };
 }
 
+#[cfg(not(target_family = "wasm"))]
 fn setup_multithreaded_tokio_runtime() {
     async_compat::set_runtime_builder(Box::new(|| {
         eprintln!("spawning a multithreaded tokio runtime");
@@ -567,6 +575,7 @@ fn setup_multithreaded_tokio_runtime() {
     }));
 }
 
+#[cfg(not(target_family = "wasm"))]
 fn setup_lightweight_tokio_runtime() {
     async_compat::set_runtime_builder(Box::new(|| {
         eprintln!("spawning a lightweight tokio runtime");