fix: use dynamic import() for CJS @slack packages

Bun blocks require() for async CJS modules. Dynamic import() forces
runtime resolution which correctly preserves Object.defineProperty
exports like WebClient and SocketModeClient.

Signed-off-by: xuezhaojun <xuezhaokeepgoing@gmail.com>

Author: xuezhaojun

opencode-slack-plugin/package-lock.json

@@ -1,6 +1,6 @@
 {
   "name": "@kubeopencode/opencode-slack-plugin",
-  "version": "0.1.3",
+  "version": "0.1.4",
   "type": "module",
   "license": "MIT",
   "description": "OpenCode plugin that connects to Slack via Socket Mode — zero port exposure, runs inside your OpenCode process",

opencode-slack-plugin/package.json

@@ -1,16 +1,16 @@
 // Copyright Contributors to the KubeOpenCode project
 import type { PluginModule, PluginInput, Hooks } from "@opencode-ai/plugin"
-import { createRequire } from "node:module"
 import * as os from "os"
-// CJS/ESM interop: @slack/web-api and @slack/socket-mode are CommonJS modules
-// that use Object.defineProperty for their exports. Bun's bundler cannot
-// resolve named imports from these (it produces "X is not a constructor" at
-// runtime). Namespace imports (import * as) also fail because Bun's bundled
-// namespace object loses the getter-defined properties. Using createRequire to
-// load them as CJS guarantees the real module.exports with all constructors.
-const require = createRequire(import.meta.url)
-const { WebClient } = require("@slack/web-api") as typeof import("@slack/web-api")
-const { SocketModeClient } = require("@slack/socket-mode") as typeof import("@slack/socket-mode")
+// CJS/ESM interop: @slack/web-api and @slack/socket-mode are CJS modules that
+// use Object.defineProperty for their exports. Bun's bundler cannot resolve
+// named imports (produces "X is not a constructor"), namespace imports lose
+// getter-defined properties in the bundled namespace, and require() is blocked
+// by Bun for async CJS modules. Dynamic import() forces Bun to handle the
+// interop at runtime, preserving all exports including constructors.
+const slackWebApi = await import("@slack/web-api") as typeof import("@slack/web-api")
+const slackSocketMode = await import("@slack/socket-mode") as typeof import("@slack/socket-mode")
+const { WebClient } = slackWebApi
+const { SocketModeClient } = slackSocketMode
 
 // ---------------------------------------------------------------------------
 // Types