fix(config): avoid dedup collisions for file:// plugins in node_modules

packages/opencode/src/config/config.ts

@@ -1,6 +1,6 @@
 import { Log } from "../util/log"
 import path from "path"
-import { pathToFileURL, fileURLToPath } from "url"
+import { pathToFileURL } from "url"
 import { createRequire } from "module"
 import os from "os"
 import z from "zod"
@@ -473,7 +473,18 @@ export namespace Config {
    */
   export function getPluginName(plugin: string): string {
     if (plugin.startsWith("file://")) {
-      return path.parse(new URL(plugin).pathname).name
+      const pathname = decodeURIComponent(new URL(plugin).pathname)
+      const parts = pathname.split("/")
+      const nodeModules = parts.lastIndexOf("node_modules")
+      if (nodeModules > -1) {
+        const name = parts[nodeModules + 1]
+        if (name?.startsWith("@")) {
+          const scoped = parts[nodeModules + 2]
+          if (scoped) return `${name}/${scoped}`
+        }
+        if (name) return name
+      }
+      return path.posix.parse(pathname).name
     }
     const lastAt = plugin.lastIndexOf("@")
     if (lastAt > 0) {

packages/opencode/test/config/config.test.ts

@@ -1542,6 +1542,14 @@ describe("getPluginName", () => {
     expect(Config.getPluginName("file:///some/path/my-plugin.js")).toBe("my-plugin")
   })
 
+  test("extracts package name from node_modules file:// URL", () => {
+    const basic = pathToFileURL(path.join("/tmp", "project", "node_modules", "foo", "index.js")).href
+    const scoped = pathToFileURL(path.join("/tmp", "project", "node_modules", "@scope", "pkg", "dist", "index.js")).href
+
+    expect(Config.getPluginName(basic)).toBe("foo")
+    expect(Config.getPluginName(scoped)).toBe("@scope/pkg")
+  })
+
   test("extracts name from npm package with version", () => {
     expect(Config.getPluginName("oh-my-opencode@2.4.3")).toBe("oh-my-opencode")
     expect(Config.getPluginName("some-plugin@1.0.0")).toBe("some-plugin")
@@ -1589,6 +1597,17 @@ describe("deduplicatePlugins", () => {
     expect(result).toEqual(["a-plugin@1.0.0", "b-plugin@1.0.0", "c-plugin@1.0.0"])
   })
 
+  test("keeps multiple npm plugins resolved as file:// URLs", () => {
+    const plugins = [
+      pathToFileURL(path.join("/tmp", "project", "node_modules", "foo", "index.js")).href,
+      pathToFileURL(path.join("/tmp", "project", "node_modules", "bar", "index.js")).href,
+    ]
+
+    const result = Config.deduplicatePlugins(plugins)
+
+    expect(result).toEqual(plugins)
+  })
+
   test("local plugin directory overrides global opencode.json plugin", async () => {
     await using tmp = await tmpdir({
       init: async (dir) => {