fix: emit bindings for imported resources without methods

crates/spidermonkey-embedding-splicer/src/bindgen.rs

@@ -587,15 +587,17 @@ impl JsBindgen<'_> {
                     ..
                 } => {
                     let iface = &self.resolve.interfaces[*i];
+                    let mut resource_function_groups = BTreeMap::<_, Vec<_>>::new();
                     for id in iface.types.values() {
                         if let TypeDefKind::Resource = &self.resolve.types[*id].kind {
                             self.resource_directions
                                 .insert(*id, AbiVariant::GuestImport);
+                            resource_function_groups.entry(Some(*id)).or_default();
                         }
                     }
 
                     let by_resource = iface.functions.iter().fold(
-                        BTreeMap::<_, Vec<_>>::new(),
+                        resource_function_groups,
                         |mut map, (name, func)| {
                             map.entry(match &func.kind {
                                 FunctionKind::Freestanding | FunctionKind::AsyncFreestanding => {

test/cases/opaque-resource-import/opaque-resource-import.js

@@ -0,0 +1,14 @@
+export let drops = 0;
+
+export class Item {
+  constructor(value) {
+    this.value = value;
+  }
+
+  [Symbol.dispose]() {
+    drops += 1;
+  }
+}
+
+export const make = value => new Item(value);
+export const value = item => item.value;

test/cases/opaque-resource-import/source.js

@@ -0,0 +1,10 @@
+import { make, value } from 'test:test/opaque-resource-import';
+
+export function test() {
+  const item = make(42);
+  try {
+    return value(item);
+  } finally {
+    item[Symbol.dispose]();
+  }
+}

test/cases/opaque-resource-import/test.js

@@ -0,0 +1,7 @@
+import { strictEqual } from 'node:assert';
+import { drops } from './opaque-resource-import.js';
+
+export function test(instance) {
+  strictEqual(instance.test(), 42);
+  strictEqual(drops, 1);
+}

test/cases/opaque-resource-import/world.wit

@@ -0,0 +1,12 @@
+package test:test;
+
+interface opaque-resource-import {
+  resource item;
+  make: func(value: u32) -> item;
+  value: func(item: borrow<item>) -> u32;
+}
+
+world test {
+  import opaque-resource-import;
+  export test: func() -> u32;
+}