Fix wasm-opt bug @see rustwasm/wasm-pack#886 (comment)

packages/sim/Cargo.toml

@@ -11,11 +11,11 @@ crate-type = ["cdylib", "rlib"]
 default = ["console_error_panic_hook"]
 
 [dependencies]
-wasm-bindgen = { version = "0.2.63", features = ["serde-serialize"] }
+wasm-bindgen = { version = "0.2.69", features = ["serde-serialize"] }
 js-sys = "0.3.46"
 serde_derive = "1.0.118"
 serde = { version = "1.0.118", features = ["derive"] }
-serde_json = "1.0.60"
+serde_json = "1.0.61"
 
 # The `console_error_panic_hook` crate provides better debugging of panics by
 # logging them with `console.error`. This is great for development, but requires
@@ -44,8 +44,11 @@ features = [
 ]
 
 [dev-dependencies]
-wasm-bindgen-test = "0.3.13"
+wasm-bindgen-test = "0.3.19"
 
 [profile.release]
 # Tell `rustc` to optimize for small code size.
-opt-level = "s"
+opt-level = "s"
+
+[package.metadata.wasm-pack.profile.release]
+wasm-opt = ["-Oz", "--enable-mutable-globals"]