RUST-1805 Only use js-sys with unknown os (#442)

Author: abr-egn

Cargo.toml

@@ -70,7 +70,7 @@ serde_with-3 = { package = "serde_with", version = "3.1.0", optional = true }
 time = { version = "0.3.9", features = ["formatting", "parsing", "macros", "large-dates"] }
 bitvec = "1.0.1"
 
-[target.'cfg(target_arch = "wasm32")'.dependencies]
+[target.'cfg(all(target_arch = "wasm32", target_os = "unknown"))'.dependencies]
 js-sys = "0.3"
 [dev-dependencies]
 assert_matches = "1.2"

src/oid.rs

@@ -239,9 +239,9 @@ impl ObjectId {
     /// Generates a new timestamp representing the current seconds since epoch.
     /// Represented in Big Endian.
     fn gen_timestamp() -> [u8; 4] {
-        #[cfg(target_arch = "wasm32")]
+        #[cfg(all(target_arch = "wasm32", target_os = "unknown"))]
         let timestamp: u32 = (js_sys::Date::now() / 1000.0) as u32;
-        #[cfg(not(target_arch = "wasm32"))]
+        #[cfg(not(all(target_arch = "wasm32", target_os = "unknown")))]
         let timestamp: u32 = SystemTime::now()
             .duration_since(SystemTime::UNIX_EPOCH)
             .expect("system clock is before 1970")