feat(tui): discover project plugins

packages/tui/test/plugin-discovery.test.ts

@@ -0,0 +1,27 @@
+import { mkdir, writeFile } from "node:fs/promises"
+import path from "node:path"
+import { expect, test } from "bun:test"
+import { discoverTuiPlugins } from "../src/plugin/discovery"
+import { tmpdir } from "./fixture/fixture"
+
+test("discovers project TUI plugin files in stable order", async () => {
+  await using tmp = await tmpdir()
+  const directory = path.join(tmp.path, ".opencode", "plugins", "tui")
+  await mkdir(path.join(directory, "nested"), { recursive: true })
+  await Promise.all([
+    writeFile(path.join(directory, "second.tsx"), "export default {}"),
+    writeFile(path.join(directory, "first.js"), "export default {}"),
+    writeFile(path.join(directory, "ignored.json"), "{}"),
+    writeFile(path.join(directory, "nested", "ignored.ts"), "export default {}"),
+  ])
+
+  expect(await discoverTuiPlugins(tmp.path)).toEqual([
+    path.join(directory, "first.js"),
+    path.join(directory, "second.tsx"),
+  ])
+})
+
+test("returns no project TUI plugins when the directory is absent", async () => {
+  await using tmp = await tmpdir()
+  expect(await discoverTuiPlugins(tmp.path)).toEqual([])
+})