diff --git a/libraries/adb-backend-direct-sockets/src/index.ts b/libraries/adb-backend-direct-sockets/src/index.ts
index 758a7497..eedbc7ab 100644
--- a/libraries/adb-backend-direct-sockets/src/index.ts
+++ b/libraries/adb-backend-direct-sockets/src/index.ts
@@ -1,4 +1,4 @@
-import { AdbBackend, ReadableStream, WritableStream } from '@yume-chan/adb';
+import type { AdbBackend, ReadableStream, WritableStream } from '@yume-chan/adb';
 
 declare global {
     interface TCPSocket {
diff --git a/libraries/adb/src/auth.ts b/libraries/adb/src/auth.ts
index f0f3d8c3..9450e52b 100644
--- a/libraries/adb/src/auth.ts
+++ b/libraries/adb/src/auth.ts
@@ -1,6 +1,6 @@
 import { PromiseResolver } from '@yume-chan/async';
-import { Disposable } from '@yume-chan/event';
-import { ValueOrPromise } from '@yume-chan/struct';
+import type { Disposable } from '@yume-chan/event';
+import type { ValueOrPromise } from '@yume-chan/struct';
 import { calculatePublicKey, calculatePublicKeyLength, sign } from './crypto';
 import { AdbCommand, AdbPacket, AdbPacketCore } from './packet';
 import { calculateBase64EncodedLength, encodeBase64 } from './utils';
diff --git a/libraries/adb/src/commands/base.ts b/libraries/adb/src/commands/base.ts
index 27c6e1d9..8ba5e758 100644
--- a/libraries/adb/src/commands/base.ts
+++ b/libraries/adb/src/commands/base.ts
@@ -1,5 +1,5 @@
 import { AutoDisposable } from '@yume-chan/event';
-import { Adb } from '../adb';
+import type { Adb } from '../adb';
 
 export class AdbCommandBase extends AutoDisposable {
     protected adb: Adb;
diff --git a/libraries/adb/src/commands/framebuffer.ts b/libraries/adb/src/commands/framebuffer.ts
index cca34b74..16e311d8 100644
--- a/libraries/adb/src/commands/framebuffer.ts
+++ b/libraries/adb/src/commands/framebuffer.ts
@@ -1,5 +1,5 @@
 import Struct from "@yume-chan/struct";
-import { Adb } from '../adb';
+import type { Adb } from '../adb';
 import { AdbBufferedStream } from '../stream';
 
 const Version =
diff --git a/libraries/adb/src/commands/install.ts b/libraries/adb/src/commands/install.ts
index d843b133..148500b3 100644
--- a/libraries/adb/src/commands/install.ts
+++ b/libraries/adb/src/commands/install.ts
@@ -1,7 +1,7 @@
-import { Adb } from "../adb";
+import type { Adb } from "../adb";
 import { WrapWritableStream, WritableStream } from "../stream";
 import { escapeArg } from "./subprocess";
-import { AdbSync } from "./sync";
+import type { AdbSync } from "./sync";
 
 export function install(
     adb: Adb,
diff --git a/libraries/adb/src/commands/sync/list.ts b/libraries/adb/src/commands/sync/list.ts
index 9f48dd48..59d28e8c 100644
--- a/libraries/adb/src/commands/sync/list.ts
+++ b/libraries/adb/src/commands/sync/list.ts
@@ -1,5 +1,5 @@
 import Struct from '@yume-chan/struct';
-import { AdbBufferedStream, WritableStreamDefaultWriter } from '../../stream';
+import type { AdbBufferedStream, WritableStreamDefaultWriter } from '../../stream';
 import { AdbSyncRequestId, adbSyncWriteRequest } from './request';
 import { AdbSyncDoneResponse, adbSyncReadResponse, AdbSyncResponseId } from './response';
 import { AdbSyncLstatResponse } from './stat';
diff --git a/libraries/adb/src/commands/sync/request.ts b/libraries/adb/src/commands/sync/request.ts
index 53f27aa5..4a37d89b 100644
--- a/libraries/adb/src/commands/sync/request.ts
+++ b/libraries/adb/src/commands/sync/request.ts
@@ -1,5 +1,5 @@
 import Struct from '@yume-chan/struct';
-import { WritableStreamDefaultWriter } from "../../stream";
+import type { WritableStreamDefaultWriter } from "../../stream";
 import { encodeUtf8 } from "../../utils";
 
 export enum AdbSyncRequestId {
diff --git a/libraries/adb/src/commands/sync/response.ts b/libraries/adb/src/commands/sync/response.ts
index a57a4803..c36d1a1c 100644
--- a/libraries/adb/src/commands/sync/response.ts
+++ b/libraries/adb/src/commands/sync/response.ts
@@ -1,5 +1,5 @@
 import Struct, { StructAsyncDeserializeStream, StructLike, StructValueType } from '@yume-chan/struct';
-import { AdbBufferedStream } from '../../stream';
+import type { AdbBufferedStream } from '../../stream';
 import { decodeUtf8 } from "../../utils";
 
 export enum AdbSyncResponseId {
diff --git a/libraries/adb/src/commands/sync/stat.ts b/libraries/adb/src/commands/sync/stat.ts
index b9dd8138..b377211c 100644
--- a/libraries/adb/src/commands/sync/stat.ts
+++ b/libraries/adb/src/commands/sync/stat.ts
@@ -1,5 +1,5 @@
 import Struct, { placeholder } from '@yume-chan/struct';
-import { AdbBufferedStream, WritableStreamDefaultWriter } from '../../stream';
+import type { AdbBufferedStream, WritableStreamDefaultWriter } from '../../stream';
 import { AdbSyncRequestId, adbSyncWriteRequest } from './request';
 import { adbSyncReadResponse, AdbSyncResponseId } from './response';
 
diff --git a/libraries/adb/src/commands/sync/sync.ts b/libraries/adb/src/commands/sync/sync.ts
index a194d589..667e4660 100644
--- a/libraries/adb/src/commands/sync/sync.ts
+++ b/libraries/adb/src/commands/sync/sync.ts
@@ -1,7 +1,7 @@
 import { AutoDisposable } from '@yume-chan/event';
-import { Adb } from '../../adb';
+import type { Adb } from '../../adb';
 import { AdbFeatures } from '../../features';
-import { AdbSocket } from '../../socket';
+import type { AdbSocket } from '../../socket';
 import { AdbBufferedStream, ReadableStream, WrapReadableStream, WrapWritableStream, WritableStream, WritableStreamDefaultWriter } from '../../stream';
 import { AutoResetEvent } from '../../utils';
 import { AdbSyncEntryResponse, adbSyncOpenDir } from './list';
diff --git a/libraries/adb/src/socket/controller.ts b/libraries/adb/src/socket/controller.ts
index d3b0e261..730a4d43 100644
--- a/libraries/adb/src/socket/controller.ts
+++ b/libraries/adb/src/socket/controller.ts
@@ -1,7 +1,7 @@
 import { PromiseResolver } from "@yume-chan/async";
 import { AdbCommand } from '../packet';
 import { ChunkStream, DuplexStreamFactory, pipeFrom, PushReadableStreamController, ReadableStream, WritableStream } from '../stream';
-import { AdbPacketDispatcher } from './dispatcher';
+import type { AdbPacketDispatcher } from './dispatcher';
 
 export interface AdbSocketInfo {
     localId: number;
diff --git a/libraries/adb/src/socket/socket.ts b/libraries/adb/src/socket/socket.ts
index 3bf2bd86..88740e67 100644
--- a/libraries/adb/src/socket/socket.ts
+++ b/libraries/adb/src/socket/socket.ts
@@ -1,5 +1,5 @@
-import { ReadableStream, WritableStream } from "../stream";
-import { AdbSocketController, AdbSocketInfo } from './controller';
+import type { ReadableStream, WritableStream } from "../stream";
+import type { AdbSocketController, AdbSocketInfo } from './controller';
 
 export class AdbSocket implements AdbSocketInfo {
     private readonly controller: AdbSocketController;
diff --git a/libraries/adb/src/stream/buffered.ts b/libraries/adb/src/stream/buffered.ts
index 832a6ae2..c974d283 100644
--- a/libraries/adb/src/stream/buffered.ts
+++ b/libraries/adb/src/stream/buffered.ts
@@ -1,6 +1,6 @@
-import { StructAsyncDeserializeStream } from '@yume-chan/struct';
-import { AdbSocket, AdbSocketInfo } from '../socket';
-import { ReadableStream, ReadableStreamDefaultReader } from './detect';
+import type { StructAsyncDeserializeStream } from '@yume-chan/struct';
+import type { AdbSocket, AdbSocketInfo } from '../socket';
+import type { ReadableStream, ReadableStreamDefaultReader } from './detect';
 import { PushReadableStream } from "./transform";
 
 export class BufferedStreamEndedError extends Error {
diff --git a/libraries/adb/src/stream/transform.ts b/libraries/adb/src/stream/transform.ts
index 640b071f..c3ffd02e 100644
--- a/libraries/adb/src/stream/transform.ts
+++ b/libraries/adb/src/stream/transform.ts
@@ -1,5 +1,6 @@
 import { PromiseResolver } from "@yume-chan/async";
-import Struct, { StructValueType } from "@yume-chan/struct";
+import type Struct from "@yume-chan/struct";
+import type { StructValueType } from "@yume-chan/struct";
 import { decodeUtf8 } from "../utils";
 import { BufferedStream, BufferedStreamEndedError } from "./buffered";
 import { AbortController, AbortSignal, QueuingStrategy, ReadableStream, ReadableStreamController, ReadableStreamDefaultReader, ReadableWritablePair, TransformStream, UnderlyingSink, UnderlyingSource, WritableStream, WritableStreamDefaultWriter } from "./detect";
diff --git a/libraries/adb/src/utils/auto-reset-event.ts b/libraries/adb/src/utils/auto-reset-event.ts
index 82003699..672fafe9 100644
--- a/libraries/adb/src/utils/auto-reset-event.ts
+++ b/libraries/adb/src/utils/auto-reset-event.ts
@@ -1,5 +1,5 @@
 import { PromiseResolver } from '@yume-chan/async';
-import { Disposable } from '@yume-chan/event';
+import type { Disposable } from '@yume-chan/event';
 
 export class AutoResetEvent implements Disposable {
     private readonly list: PromiseResolver<void>[] = [];
diff --git a/libraries/scrcpy/src/connection.ts b/libraries/scrcpy/src/connection.ts
index 4593dbfb..ceea7bba 100644
--- a/libraries/scrcpy/src/connection.ts
+++ b/libraries/scrcpy/src/connection.ts
@@ -1,6 +1,6 @@
 import { Adb, AdbBufferedStream, AdbSocket } from "@yume-chan/adb";
-import { Disposable } from "@yume-chan/event";
-import { ValueOrPromise } from "@yume-chan/struct";
+import type { Disposable } from "@yume-chan/event";
+import type { ValueOrPromise } from "@yume-chan/struct";
 import { delay } from "./utils";
 
 export interface ScrcpyClientConnectionOptions {
diff --git a/toolchain/ts-package-builder/tsconfig.base.json b/toolchain/ts-package-builder/tsconfig.base.json
index 26eea596..36f757c5 100644
--- a/toolchain/ts-package-builder/tsconfig.base.json
+++ b/toolchain/ts-package-builder/tsconfig.base.json
@@ -34,6 +34,7 @@
         "noImplicitThis": true,
         "noUncheckedIndexedAccess": true,
         "resolveJsonModule": true,
+        "importsNotUsedAsValues": "error",
         /* Module Resolution Options */
         "moduleResolution": "Node", //            /* Specify module resolution strategy: 'node' (Node.js) or 'classic' (TypeScript pre-1.6). */
         // "baseUrl": "./",                       /* Base directory to resolve non-absolute module names. */