Fix wasm build

Cargo.toml

@@ -21,6 +21,7 @@ cfg-if = "1"
 cidr = { version = "0.2", features = ["serde"] }
 criterion = "0.5"
 fnv = "1.0.6"
+getrandom = { version = "0.3" }
 indoc = "2"
 libc = "0.2.42"
 memmem = "0.1.1"

engine/Cargo.toml

@@ -40,3 +40,9 @@ indoc.workspace = true
 [features]
 default = [ "regex" ]
 regex = ["dep:regex-automata"]
+
+[target.'cfg(target_family = "wasm")'.dependencies]
+# By default, getrandom doesn't have any source of randomness on wasm32-unknown.
+# This optional dependency allows us to build with `--features getrandom/wasm_js`.
+# For more information see: https://docs.rs/getrandom/#webassembly-support
+getrandom.workspace = true

engine/src/ast/field_expr.rs

@@ -655,20 +655,24 @@ impl Expr for ComparisonExpr {
                     use rand::{Rng, rng};
                     use sliceslice::wasm32::*;
 
-                    impl Compare<U> for Wasm32Searcher {
+                    struct WasmSearcher(Wasm32Searcher<Box<[u8]>>);
+
+                    impl<U> Compare<U> for WasmSearcher {
                         #[inline]
                         fn compare<'e>(
                             &self,
                             value: &LhsValue<'e>,
                             _: &'e ExecutionContext<'e, U>,
                         ) -> bool {
-                            self.search_in(cast_value!(value, Bytes))
+                            unsafe { self.0.search_in(cast_value!(value, Bytes)) }
                         }
                     }
 
                     let position = rng().random_range(1..bytes.len());
 
-                    return unsafe { search!(Wasm32Searcher::with_position(bytes, position)) };
+                    return unsafe {
+                        search!(WasmSearcher(Wasm32Searcher::with_position(bytes, position)))
+                    };
                 }
 
                 search!(TwoWaySearcher::new(bytes))