fix(plugin): skip non-function exports instead of throwing

packages/opencode/src/plugin/index.ts

@@ -100,7 +100,9 @@ function getLegacyPlugins(mod: Record<string, unknown>) {
     if (seen.has(entry)) continue
     seen.add(entry)
     const plugin = getServerPlugin(entry)
-    if (!plugin) throw new TypeError("Plugin export is not a function")
+    // Skip non-plugin exports (constants, helpers, etc.) instead of throwing —
+    // a single non-function export must not discard the module's real plugins.
+    if (!plugin) continue
     result.push(plugin)
   }
 

packages/opencode/test/plugin/trigger.test.ts

@@ -105,4 +105,21 @@ describe("plugin.trigger", () => {
       }),
     ),
   )
+
+  it.instance("loads a plugin module that also exports non-function values", () =>
+    withProject(
+      [
+        'export const VERSION = "1.0.0"',
+        "export const plugin = async () => ({",
+        `  ${JSON.stringify(systemHook)}: (_input, output) => {`,
+        '    output.system.unshift("sync")',
+        "  },",
+        "})",
+        "",
+      ].join("\n"),
+      Effect.gen(function* () {
+        expect(yield* triggerSystemTransform()).toEqual(["sync"])
+      }),
+    ),
+  )
 })