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diff --git a/js/src/wasm/WasmIntrinsic.h b/js/src/wasm/WasmIntrinsic.h
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+++ b/js/src/wasm/WasmIntrinsic.h
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+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*-
+ * vim: set ts=8 sts=2 et sw=2 tw=80:
+ *
+ * Copyright 2021 Mozilla Foundation
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef wasm_intrinsic_h
+#define wasm_intrinsic_h
+
+#include "mozilla/Span.h"
+
+#include "wasm/WasmBuiltins.h"
+#include "wasm/WasmCompileArgs.h"
+#include "wasm/WasmConstants.h"
+#include "wasm/WasmTypeDecls.h"
+#include "wasm/WasmTypeDef.h"
+
+namespace js {
+namespace wasm {
+
+// An intrinsic is a natively implemented function that may be compiled into an
+// 'intrinsic module', which may be instantiated with a provided memory
+// yielding an exported WebAssembly function wrapping the intrinsic.
+struct Intrinsic {
+  // The name of the intrinsic as it is exported
+  const char* exportName;
+  // The params taken by the intrinsic. No results are required for intrinsics
+  // at this time, so we omit them
+  mozilla::Span<const ValType> params;
+  // The signature of the builtin that implements the intrinsic
+  const SymbolicAddressSignature& signature;
+
+  // Allocate a FuncType for this intrinsic, returning false for OOM
+  bool funcType(FuncType* type) const;
+
+  // Get the Intrinsic for an IntrinsicId. IntrinsicId must be validated.
+  static const Intrinsic& getFromId(IntrinsicId id);
+};
+
+// Compile and return the intrinsic module for a given set of operations.
+bool CompileIntrinsicModule(JSContext* cx, const mozilla::Span<IntrinsicId> ids,
+                            Shareable sharedMemory,
+                            MutableHandle<WasmModuleObject*> result);
+
+}  // namespace wasm
+}  // namespace js
+
+#endif  // wasm_intrinsic_h