diff --git a/src/apiutils.ts b/src/apiutils.ts
index 1b9ac7ad..59102cbb 100644
--- a/src/apiutils.ts
+++ b/src/apiutils.ts
@@ -1,6 +1,5 @@
 import fuzzy from 'fuzzy';
 import {script_v1 as scriptV1} from 'googleapis';
-import {ReadonlyDeep} from 'type-fest';
 
 import {loadAPICredentials, serviceUsage} from './auth';
 import {ClaspError} from './clasp-error';
@@ -9,6 +8,8 @@ import {enableOrDisableAdvanceServiceInManifest} from './manifest';
 import {ERROR} from './messages';
 import {getProjectId, spinner, stopSpinner} from './utils';
 
+import type {ReadonlyDeep} from 'type-fest';
+
 type TypeFunction = Readonly<scriptV1.Schema$GoogleAppsScriptTypeFunction>;
 
 /**
diff --git a/src/auth.ts b/src/auth.ts
index b2b8d34a..00961ce7 100644
--- a/src/auth.ts
+++ b/src/auth.ts
@@ -1,18 +1,21 @@
 import {Credentials, GenerateAuthUrlOpts, OAuth2Client, OAuth2ClientOptions} from 'google-auth-library';
 import {google, script_v1 as scriptV1} from 'googleapis';
-import {createServer, IncomingMessage, Server, ServerResponse} from 'http';
-import {AddressInfo} from 'net';
+import {createServer} from 'http';
 import open from 'open';
 import readline from 'readline';
-import {ReadonlyDeep} from 'type-fest';
 import {URL} from 'url';
 
 import {ClaspError} from './clasp-error';
 import {ClaspToken, DOTFILE, Dotfile} from './dotfile';
+import {ERROR, LOG} from './messages';
+import {checkIfOnlineOrDie, getOAuthSettings} from './utils';
 // import {oauthScopesPrompt} from './inquirer';
 // import {readManifest} from './manifest';
-import {ERROR, LOG} from './messages';
-import {checkIfOnlineOrDie, ClaspCredentials, getOAuthSettings} from './utils';
+
+import type {IncomingMessage, Server, ServerResponse} from 'http';
+import type {AddressInfo} from 'net';
+import type {ReadonlyDeep} from 'type-fest';
+import type {ClaspCredentials} from './utils';
 
 /**
  * Authentication with Google's APIs.
diff --git a/src/commands/apis.ts b/src/commands/apis.ts
index 67ee9784..37e4fd83 100644
--- a/src/commands/apis.ts
+++ b/src/commands/apis.ts
@@ -1,7 +1,5 @@
-import {GaxiosResponse} from 'gaxios';
 import {discovery_v1 as discoveryV1, serviceusage_v1 as serviceUsageV1} from 'googleapis';
 import open from 'open';
-import {ReadonlyDeep} from 'type-fest';
 
 import {PUBLIC_ADVANCED_SERVICES} from '../apis';
 import {enableOrDisableAPI} from '../apiutils';
@@ -11,6 +9,9 @@ import {ERROR} from '../messages';
 import {URL} from '../urls';
 import {checkIfOnlineOrDie, getProjectId} from '../utils';
 
+import type {GaxiosResponse} from 'gaxios';
+import type {ReadonlyDeep} from 'type-fest';
+
 type DirectoryItem = Unpacked<discoveryV1.Schema$DirectoryList['items']>;
 type PublicAdvancedService = ReadonlyDeep<Required<NonNullable<DirectoryItem>>>;
 
@@ -31,10 +32,10 @@ export default async (options: CommandOption): Promise<void> => {
     return await openApiUrl();
   }
 
-  // @ts-expect-error
-  const [bin, sourcePath, ...args] = process.argv;
-  // @ts-expect-error
-  const [command, subCommand, serviceName] = args;
+  // @ts-expect-error 'xxx' is declared but its value is never read.
+  const [_bin, _sourcePath, ...args] = process.argv;
+  // @ts-expect-error 'xxx' is declared but its value is never read.
+  const [_command, subCommand, serviceName] = args;
 
   // The apis subcommands.
   const apiSubCommands: {[key: string]: () => Promise<void>} = {
diff --git a/src/commands/default.ts b/src/commands/default.ts
index fd019553..025ade30 100644
--- a/src/commands/default.ts
+++ b/src/commands/default.ts
@@ -1,9 +1,9 @@
-import {Command} from 'commander';
-import {ReadonlyDeep} from 'type-fest';
-
 import {ClaspError} from '../clasp-error';
 import {ERROR} from '../messages';
 
+import type {Command} from 'commander';
+import type {ReadonlyDeep} from 'type-fest';
+
 /**
  * Displays a default message when an unknown command is typed.
  * @param command {string} The command that was typed.
diff --git a/src/files.ts b/src/files.ts
index f1dd73a4..5015c1ca 100644
--- a/src/files.ts
+++ b/src/files.ts
@@ -35,7 +35,7 @@ const projectFileWithContent = (file: ProjectFile, transpileOptions: ts.Transpil
   return type === 'TS'
     ? // Transpile TypeScript to Google Apps Script
       // @see github.com/grant/ts2gas
-      {...file, source: ts2gas(source, transpileOptions), type: 'SERVER_JS'}
+      {...file, source: ts2gas(source, transpileOptions as any), type: 'SERVER_JS'}
     : {...file, source, type};
 };
 
@@ -247,7 +247,7 @@ export const isValidFileName = (
   name: string,
   type: string,
   rootDir: string,
-  // @ts-expect-error
+  // @ts-expect-error 'xxx' is declared but its value is never read.
   normalizedName: string,
   ignoreMatches: readonly string[]
 ): boolean => {
diff --git a/src/index.ts b/src/index.ts
index ed94985f..31de8e2b 100755
--- a/src/index.ts
+++ b/src/index.ts
@@ -342,8 +342,8 @@ commander
  */
 commander.command('*', {isDefault: true}).description('Any other command is not supported').action(defaultCmd);
 
-// @ts-expect-error
-const [bin, sourcePath, ...args] = process.argv;
+// @ts-expect-error 'xxx' is declared but its value is never read.
+const [_bin, _sourcePath, ...args] = process.argv;
 // Defaults to help if commands are not provided
 if (args.length === 0) {
   commander.outputHelp();
diff --git a/src/inquirer.ts b/src/inquirer.ts
index eb8ab73b..c7aebeb8 100644
--- a/src/inquirer.ts
+++ b/src/inquirer.ts
@@ -1,11 +1,12 @@
 import {script_v1 as scriptV1} from 'googleapis';
 import {prompt, registerPrompt} from 'inquirer';
 import autocomplete from 'inquirer-autocomplete-prompt-ipt';
-import {ReadonlyDeep} from 'type-fest';
 
 import {SCRIPT_TYPES} from './apis';
 import {LOG} from './messages';
 
+import type {ReadonlyDeep} from 'type-fest';
+
 registerPrompt('autocomplete', autocomplete);
 
 export type functionNameSource = (