Revert "web: No longer set the `web_sys_unstable_apis` config variable"

This reverts commit 5b7c48e43d.

Co-authored-by: TÖRÖK Attila <torokati44@gmail.com>

.cargo/config.toml

@@ -1,3 +1,11 @@
+[target.'cfg(all())']
+# NOTE that the web build overrides this setting in package.json via the RUSTFLAGS environment variable
+rustflags = [
+    # We need to specify this flag for all targets because Clippy checks all of our code against all targets
+    # and our web code does not compile without this flag
+    "--cfg=web_sys_unstable_apis",
+]
+
 [target.x86_64-pc-windows-msvc]
 # Use the LLD linker, it should be faster than the default.
 # See: https://github.com/rust-lang/rust/issues/71520

web/packages/core/tools/build_wasm.ts

@@ -84,7 +84,7 @@ function buildWasm(
     extensions: boolean,
     wasmSource: string,
 ) {
-    const rustFlags = ["-Aunknown_lints"];
+    const rustFlags = ["--cfg=web_sys_unstable_apis", "-Aunknown_lints"];
     const wasmBindgenFlags = [];
     const wasmOptFlags = [];
     const flavor = extensions ? "extensions" : "vanilla";