diff --git a/src/config/types.channels.ts b/src/config/types.channels.ts
index b73fcf3737e..9094e8b660f 100644
--- a/src/config/types.channels.ts
+++ b/src/config/types.channels.ts
@@ -1,4 +1,13 @@
 import type { ContextVisibilityMode, GroupPolicy } from "./types.base.js";
+import type { DiscordConfig } from "./types.discord.js";
+import type { GoogleChatConfig } from "./types.googlechat.js";
+import type { IMessageConfig } from "./types.imessage.js";
+import type { IrcConfig } from "./types.irc.js";
+import type { MSTeamsConfig } from "./types.msteams.js";
+import type { SignalConfig } from "./types.signal.js";
+import type { SlackConfig } from "./types.slack.js";
+import type { TelegramConfig } from "./types.telegram.js";
+import type { WhatsAppConfig } from "./types.whatsapp.js";
 
 export type ChannelHeartbeatVisibilityConfig = {
   /** Show HEARTBEAT_OK acknowledgments in chat (default: false). */
@@ -74,6 +83,15 @@ export interface ChannelsConfig {
   defaults?: ChannelDefaultsConfig;
   /** Map provider -> channel id -> model override. */
   modelByChannel?: ChannelModelByChannelConfig;
+  discord?: DiscordConfig;
+  googlechat?: GoogleChatConfig;
+  imessage?: IMessageConfig;
+  irc?: IrcConfig;
+  msteams?: MSTeamsConfig;
+  signal?: SignalConfig;
+  slack?: SlackConfig;
+  telegram?: TelegramConfig;
+  whatsapp?: WhatsAppConfig;
   /**
    * Channel sections are plugin-owned and keyed by arbitrary channel ids.
    * Keep the lookup permissive so augmented channel configs remain ergonomic at call sites.
diff --git a/src/config/types.discord.ts b/src/config/types.discord.ts
index 59d589bfdef..4f0bb693d51 100644
--- a/src/config/types.discord.ts
+++ b/src/config/types.discord.ts
@@ -440,9 +440,3 @@ export type DiscordConfig = {
   /** Optional default account id when multiple accounts are configured. */
   defaultAccount?: string;
 } & DiscordAccountConfig;
-
-declare module "./types.channels.js" {
-  interface ChannelsConfig {
-    discord?: DiscordConfig;
-  }
-}
diff --git a/src/config/types.googlechat.ts b/src/config/types.googlechat.ts
index 495ab5dd04e..15a5db99105 100644
--- a/src/config/types.googlechat.ts
+++ b/src/config/types.googlechat.ts
@@ -121,9 +121,3 @@ export type GoogleChatConfig = {
   /** Optional default account id when multiple accounts are configured. */
   defaultAccount?: string;
 } & GoogleChatAccountConfig;
-
-declare module "./types.channels.js" {
-  interface ChannelsConfig {
-    googlechat?: GoogleChatConfig;
-  }
-}
diff --git a/src/config/types.imessage.ts b/src/config/types.imessage.ts
index 089fd1273c6..1fe00bbab43 100644
--- a/src/config/types.imessage.ts
+++ b/src/config/types.imessage.ts
@@ -163,9 +163,3 @@ export type IMessageConfig = {
   /** Optional default account id when multiple accounts are configured. */
   defaultAccount?: string;
 } & IMessageAccountConfig;
-
-declare module "./types.channels.js" {
-  interface ChannelsConfig {
-    imessage?: IMessageConfig;
-  }
-}
diff --git a/src/config/types.irc.ts b/src/config/types.irc.ts
index f093fde26af..bccb71ba68e 100644
--- a/src/config/types.irc.ts
+++ b/src/config/types.irc.ts
@@ -59,9 +59,3 @@ export type IrcConfig = {
   /** Optional default account id when multiple accounts are configured. */
   defaultAccount?: string;
 } & IrcAccountConfig;
-
-declare module "./types.channels.js" {
-  interface ChannelsConfig {
-    irc?: IrcConfig;
-  }
-}
diff --git a/src/config/types.msteams.ts b/src/config/types.msteams.ts
index c4dc8f4cc5d..a91c9c39015 100644
--- a/src/config/types.msteams.ts
+++ b/src/config/types.msteams.ts
@@ -194,9 +194,3 @@ export type MSTeamsConfig = {
   /** Bot Framework OAuth SSO (signin/tokenExchange + signin/verifyState) settings. */
   sso?: MSTeamsSsoConfig;
 };
-
-declare module "./types.channels.js" {
-  interface ChannelsConfig {
-    msteams?: MSTeamsConfig;
-  }
-}
diff --git a/src/config/types.signal.ts b/src/config/types.signal.ts
index 3ae784d228b..11e434fb7cf 100644
--- a/src/config/types.signal.ts
+++ b/src/config/types.signal.ts
@@ -62,9 +62,3 @@ export type SignalConfig = {
   /** Optional default account id when multiple accounts are configured. */
   defaultAccount?: string;
 } & SignalAccountConfig;
-
-declare module "./types.channels.js" {
-  interface ChannelsConfig {
-    signal?: SignalConfig;
-  }
-}
diff --git a/src/config/types.slack.ts b/src/config/types.slack.ts
index 927b8d1b8bf..ca11205f5b3 100644
--- a/src/config/types.slack.ts
+++ b/src/config/types.slack.ts
@@ -221,9 +221,3 @@ export type SlackConfig = {
   /** Optional default account id when multiple accounts are configured. */
   defaultAccount?: string;
 } & SlackAccountConfig;
-
-declare module "./types.channels.js" {
-  interface ChannelsConfig {
-    slack?: SlackConfig;
-  }
-}
diff --git a/src/config/types.telegram.ts b/src/config/types.telegram.ts
index e96d0c82f02..f2b0aab13bf 100644
--- a/src/config/types.telegram.ts
+++ b/src/config/types.telegram.ts
@@ -323,9 +323,3 @@ export type TelegramConfig = {
   /** Optional default account id when multiple accounts are configured. */
   defaultAccount?: string;
 } & TelegramAccountConfig;
-
-declare module "./types.channels.js" {
-  interface ChannelsConfig {
-    telegram?: TelegramConfig;
-  }
-}
diff --git a/src/config/types.whatsapp.ts b/src/config/types.whatsapp.ts
index 0d52fee9dea..218096f1aa7 100644
--- a/src/config/types.whatsapp.ts
+++ b/src/config/types.whatsapp.ts
@@ -145,9 +145,3 @@ export type WhatsAppAccountConfig = WhatsAppConfigCore &
     /** Override auth directory (Baileys multi-file auth state). */
     authDir?: string;
   };
-
-declare module "./types.channels.js" {
-  interface ChannelsConfig {
-    whatsapp?: WhatsAppConfig;
-  }
-}
diff --git a/src/infra/tsdown-config.test.ts b/src/infra/tsdown-config.test.ts
index 440b9ce9300..f172e21a961 100644
--- a/src/infra/tsdown-config.test.ts
+++ b/src/infra/tsdown-config.test.ts
@@ -163,19 +163,27 @@ describe("tsdown config", () => {
     const external = unifiedGraph?.inputOptions?.({})?.external;
 
     if (typeof neverBundle === "function") {
+      expect(neverBundle("@discordjs/voice")).toBe(true);
       expect(neverBundle("@lancedb/lancedb")).toBe(true);
       expect(neverBundle("@larksuiteoapi/node-sdk")).toBe(true);
       expect(neverBundle("@matrix-org/matrix-sdk-crypto-nodejs")).toBe(true);
+      expect(neverBundle("@vitest/expect")).toBe(true);
       expect(neverBundle("matrix-js-sdk/lib/client.js")).toBe(true);
+      expect(neverBundle("prism-media")).toBe(true);
       expect(neverBundle("qrcode-terminal/lib/main.js")).toBe(true);
+      expect(neverBundle("vitest")).toBe(true);
       expect(neverBundle("not-a-runtime-dependency")).toBe(false);
     } else {
       expect(neverBundle).toEqual(
         expect.arrayContaining([
+          "@discordjs/voice",
           "@lancedb/lancedb",
           "@larksuiteoapi/node-sdk",
+          "@vitest/expect",
           "matrix-js-sdk",
+          "prism-media",
           "qrcode-terminal",
+          "vitest",
         ]),
       );
     }
diff --git a/tsdown.config.ts b/tsdown.config.ts
index fc8406f1608..f22aa6d6114 100644
--- a/tsdown.config.ts
+++ b/tsdown.config.ts
@@ -161,11 +161,15 @@ const bundledPluginRoot = (pluginId: string) => ["extensions", pluginId].join("/
 const bundledPluginFile = (pluginId: string, relativePath: string) =>
   `${bundledPluginRoot(pluginId)}/${relativePath}`;
 const explicitNeverBundleDependencies = [
+  "@discordjs/voice",
   "@lancedb/lancedb",
   "@larksuiteoapi/node-sdk",
   "@matrix-org/matrix-sdk-crypto-nodejs",
+  "@vitest/expect",
   "matrix-js-sdk",
+  "prism-media",
   "qrcode-terminal",
+  "vitest",
 ].toSorted((left, right) => left.localeCompare(right));
 
 function shouldNeverBundleDependency(id: string): boolean {