Don't crash on unexpected imports

Author: surma

lib/asbind-instance/bind-function.js

@@ -159,7 +159,12 @@ export function bindImportFunction(
     importObjectKeyPathToFunction
   );
   if (!importedFunctionDescriptor) {
-    throw Error(`Unknown function ${importObjectKeyPathToFunction.join(".")}`);
+    console.warn(
+      `Unexpected function ${importObjectKeyPathToFunction.join(
+        "."
+      )} on import object, using pass-through.`
+    );
+    return importedFunction;
   }
 
   // Grab type converter functions according to the type descriptor

test/tests/unexpected-import/asc.ts

@@ -0,0 +1,3 @@
+export function thing(): i8 {
+  return -1;
+}

test/tests/unexpected-import/test.js

@@ -0,0 +1,10 @@
+describe("as-bind", function() {
+  it("should handle unexpected imports gracefully", async function() {
+    const instance = await AsBind.instantiate(this.rawModule, {
+      env: {
+        someFunc() {}
+      }
+    });
+    assert(instance.exports.thing() === -1);
+  });
+});