diff --git a/src/glue/binaryen.d.ts b/src/glue/binaryen.d.ts
index 153169a97f..be422e9759 100644
--- a/src/glue/binaryen.d.ts
+++ b/src/glue/binaryen.d.ts
@@ -82,6 +82,16 @@ export declare function _BinaryenHeapTypeNofunc(): HeapTypeRef;
 
 export declare function _BinaryenHeapTypeIsBottom(heapType: HeapTypeRef): bool;
 export declare function _BinaryenHeapTypeGetBottom(heapType: HeapTypeRef): HeapTypeRef;
+export declare function _BinaryenHeapTypeIsSubType(left: HeapTypeRef, right: HeapTypeRef): bool;
+export declare function _BinaryenStructTypeGetNumFields(heapType: HeapTypeRef): Index;
+export declare function _BinaryenStructTypeGetFieldType(heapType: HeapTypeRef, index: Index): TypeRef;
+export declare function _BinaryenStructTypeGetFieldPackedType(heapType: HeapTypeRef, index: Index): PackedType;
+export declare function _BinaryenStructTypeIsFieldMutable(heapType: HeapTypeRef, index: Index): bool;
+export declare function _BinaryenArrayTypeGetElementType(heapType: HeapTypeRef): TypeRef;
+export declare function _BinaryenArrayTypeGetElementPackedType(heapType: HeapTypeRef): PackedType;
+export declare function _BinaryenArrayTypeIsElementMutable(heapType: HeapTypeRef): bool;
+export declare function _BinaryenSignatureTypeGetParams(heapType: HeapTypeRef): TypeRef;
+export declare function _BinaryenSignatureTypeGetResults(heapType: HeapTypeRef): TypeRef;
 
 export declare function _BinaryenModuleCreate(): ModuleRef;
 export declare function _BinaryenModuleDispose(module: ModuleRef): void;
diff --git a/src/glue/binaryen.js b/src/glue/binaryen.js
index 76a98a75b7..cb3e4d3013 100644
--- a/src/glue/binaryen.js
+++ b/src/glue/binaryen.js
@@ -45,6 +45,16 @@ export const {
 
   _BinaryenHeapTypeIsBottom,
   _BinaryenHeapTypeGetBottom,
+  _BinaryenHeapTypeIsSubType,
+  _BinaryenStructTypeGetNumFields,
+  _BinaryenStructTypeGetFieldType,
+  _BinaryenStructTypeGetFieldPackedType,
+  _BinaryenStructTypeIsFieldMutable,
+  _BinaryenArrayTypeGetElementType,
+  _BinaryenArrayTypeGetElementPackedType,
+  _BinaryenArrayTypeIsElementMutable,
+  _BinaryenSignatureTypeGetParams,
+  _BinaryenSignatureTypeGetResults,
 
   _BinaryenModuleCreate,
   _BinaryenModuleDispose,
diff --git a/src/module.ts b/src/module.ts
index a7c88871b6..f74fcf9c59 100644
--- a/src/module.ts
+++ b/src/module.ts
@@ -124,6 +124,10 @@ export namespace HeapTypeRef {
   export function getBottom(ht: HeapTypeRef): HeapTypeRef {
     return binaryen._BinaryenHeapTypeGetBottom(ht);
   }
+
+  export function isSubtype(ht: HeapTypeRef, superHt: HeapTypeRef): bool {
+    return binaryen._BinaryenHeapTypeIsSubType(ht, superHt);
+  }
 }
 
 /** Packed array element respectively struct field types. */