plugin: Plugin modules now export a single top level identifier

Makes typing much easier. Addresse's Will's last comment.

test/test-plugin/src/index.ts

@@ -2,33 +2,35 @@ import * as express from "express"
 import * as fspath from "path"
 import * as pluginapi from "../../../typings/pluginapi"
 
-export const displayName = "Test Plugin"
-export const routerPath = "/test-plugin"
-export const homepageURL = "https://example.com"
-export const description = "Plugin used in code-server tests."
+export const plugin: pluginapi.Plugin = {
+  displayName: "Test Plugin",
+  routerPath: "/test-plugin",
+  homepageURL: "https://example.com",
+  description: "Plugin used in code-server tests.",
 
-export function init(config: pluginapi.PluginConfig) {
-  config.logger.debug("test-plugin loaded!")
-}
-
-export function router(): express.Router {
-  const r = express.Router()
-  r.get("/goland/icon.svg", (req, res) => {
-    res.sendFile(fspath.resolve(__dirname, "../public/icon.svg"))
-  })
-  return r
-}
-
-export function applications(): pluginapi.Application[] {
-  return [
-    {
-      name: "Test App",
-      version: "4.0.0",
-      iconPath: "/icon.svg",
-      path: "/test-app",
-
-      description: "This app does XYZ.",
-      homepageURL: "https://example.com",
-    },
-  ]
+  init: (config) => {
+    config.logger.debug("test-plugin loaded!")
+  },
+
+  router: () => {
+    const r = express.Router()
+    r.get("/goland/icon.svg", (req, res) => {
+      res.sendFile(fspath.resolve(__dirname, "../public/icon.svg"))
+    })
+    return r
+  },
+
+  applications: () => {
+    return [
+      {
+        name: "Test App",
+        version: "4.0.0",
+        iconPath: "/icon.svg",
+        path: "/test-app",
+
+        description: "This app does XYZ.",
+        homepageURL: "https://example.com",
+      },
+    ]
+  },
 }