diff --git a/app/renderer/js/spellchecker.ts b/app/renderer/js/spellchecker.ts
index b9dbe3a0..fdcb1471 100644
--- a/app/renderer/js/spellchecker.ts
+++ b/app/renderer/js/spellchecker.ts
@@ -1,18 +1,26 @@
 'use strict';
 
+import type { Subject } from 'rxjs';
 import { SpellCheckHandler, ContextMenuListener, ContextMenuBuilder } from 'electron-spellchecker';
 
 import ConfigUtil = require('./utils/config-util');
 import Logger = require('./utils/logger-util');
 
+declare module 'electron-spellchecker' {
+	interface SpellCheckHandler {
+		currentSpellcheckerChanged: Subject<true>;
+		currentSpellcheckerLanguage: string;
+	}
+}
+
 const logger = new Logger({
 	file: 'errors.log',
 	timestamp: true
 });
 
 class SetupSpellChecker {
-	SpellCheckHandler: typeof SpellCheckHandler;
-	contextMenuListener: typeof ContextMenuListener;
+	SpellCheckHandler: SpellCheckHandler;
+	contextMenuListener: ContextMenuListener;
 	init(serverLanguage: string): void {
 		if (ConfigUtil.getConfigItem('enableSpellchecker')) {
 			this.enableSpellChecker();
@@ -38,7 +46,7 @@ class SetupSpellChecker {
 		}
 
 		const contextMenuBuilder = new ContextMenuBuilder(this.SpellCheckHandler);
-		this.contextMenuListener = new ContextMenuListener((info: object) => {
+		this.contextMenuListener = new ContextMenuListener(info => {
 			contextMenuBuilder.showPopupMenu(info);
 		});
 	}
diff --git a/package-lock.json b/package-lock.json
index 2af15754..4e6ec43f 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -537,6 +537,27 @@
         "@types/node": "*"
       }
     },
+    "@types/auto-launch": {
+      "version": "5.0.1",
+      "resolved": "https://registry.npmjs.org/@types/auto-launch/-/auto-launch-5.0.1.tgz",
+      "integrity": "sha512-+KQ+/koZ7sJXnf5cnCANofY6yXAdYJNEoVZEuWcwJfuWbUp9u6l09I7KhwD+ivU+cdz7JId4V5ukxscWtHdSuw==",
+      "dev": true
+    },
+    "@types/backoff": {
+      "version": "2.5.1",
+      "resolved": "https://registry.npmjs.org/@types/backoff/-/backoff-2.5.1.tgz",
+      "integrity": "sha512-eUNAT0dGCma0K35XcScxCP5usgCyxFypkVUN1TiHLhqGzbLnb/fVhz5yoXzj/SYLuXxE9SK6k4m+FQZQqQ4QaQ==",
+      "dev": true,
+      "requires": {
+        "@types/node": "*"
+      }
+    },
+    "@types/caseless": {
+      "version": "0.12.2",
+      "resolved": "https://registry.npmjs.org/@types/caseless/-/caseless-0.12.2.tgz",
+      "integrity": "sha512-6ckxMjBBD8URvjB6J3NcnuAn5Pkl7t3TizAg+xdlzzQGSPSmBcXf8KoIH0ua/i+tio+ZRUHEXp0HEmvaR4kt0w==",
+      "dev": true
+    },
     "@types/color-name": {
       "version": "1.1.1",
       "resolved": "https://registry.npmjs.org/@types/color-name/-/color-name-1.1.1.tgz",
@@ -549,6 +570,21 @@
       "integrity": "sha512-Q1y515GcOdTHgagaVFhHnIFQ38ygs/kmxdNpvpou+raI9UO3YZcHDngBSYKQklcKlvA7iuQlmIKbzvmxcOE9CQ==",
       "dev": true
     },
+    "@types/electron-spellchecker": {
+      "version": "1.1.2",
+      "resolved": "https://registry.npmjs.org/@types/electron-spellchecker/-/electron-spellchecker-1.1.2.tgz",
+      "integrity": "sha512-rVPuBtBf6C5Sh8ixkx3MfpvNiI+/sBtrin79+dGhG1kCUxvajX+5L9gWePGhqO6AuHLyRQ06et6WVWtgtWoY4g==",
+      "dev": true,
+      "requires": {
+        "electron": ">=1.6.10"
+      }
+    },
+    "@types/escape-html": {
+      "version": "0.0.20",
+      "resolved": "https://registry.npmjs.org/@types/escape-html/-/escape-html-0.0.20.tgz",
+      "integrity": "sha512-6dhZJLbA7aOwkYB2GDGdIqJ20wmHnkDzaxV9PJXe7O02I2dSFTERzRB6JrX6cWKaS+VqhhY7cQUMCbO5kloFUw==",
+      "dev": true
+    },
     "@types/eslint-visitor-keys": {
       "version": "1.0.0",
       "resolved": "https://registry.npmjs.org/@types/eslint-visitor-keys/-/eslint-visitor-keys-1.0.0.tgz",
@@ -561,6 +597,15 @@
       "integrity": "sha512-EaObqwIvayI5a8dCzhFrjKzVwKLxjoG9T6Ppd5CEo07LRKfQ8Yokw54r5+Wq7FaBQ+yXRvQAYPrHwya1/UFt9g==",
       "dev": true
     },
+    "@types/fs-extra": {
+      "version": "8.1.0",
+      "resolved": "https://registry.npmjs.org/@types/fs-extra/-/fs-extra-8.1.0.tgz",
+      "integrity": "sha512-UoOfVEzAUpeSPmjm7h1uk5MH6KZma2z2O7a75onTGjnNvAvMVrPzPL/vBbT65iIGHWj6rokwfmYcmxmlSf2uwg==",
+      "dev": true,
+      "requires": {
+        "@types/node": "*"
+      }
+    },
     "@types/glob": {
       "version": "7.1.1",
       "resolved": "https://registry.npmjs.org/@types/glob/-/glob-7.1.1.tgz",
@@ -572,6 +617,12 @@
         "@types/node": "*"
       }
     },
+    "@types/i18n": {
+      "version": "0.8.6",
+      "resolved": "https://registry.npmjs.org/@types/i18n/-/i18n-0.8.6.tgz",
+      "integrity": "sha512-LUJ+htzQKV6HnUIfLpDVtoEq14xEqD+WjgU4yx9Wzo3rhgvCQcDFafhsYcjTb6XyYd9xDEYKNZjR0LPe+fNMyw==",
+      "dev": true
+    },
     "@types/json-schema": {
       "version": "7.0.4",
       "resolved": "https://registry.npmjs.org/@types/json-schema/-/json-schema-7.0.4.tgz",
@@ -607,6 +658,18 @@
       "integrity": "sha512-//oorEZjL6sbPcKUaCdIGlIUeH26mgzimjBB77G6XRgnDl/L5wOnpyBGRe/Mmf5CVW3PwEBE1NjiMZ/ssFh4wA==",
       "dev": true
     },
+    "@types/request": {
+      "version": "2.48.4",
+      "resolved": "https://registry.npmjs.org/@types/request/-/request-2.48.4.tgz",
+      "integrity": "sha512-W1t1MTKYR8PxICH+A4HgEIPuAC3sbljoEVfyZbeFJJDbr30guDspJri2XOaM2E+Un7ZjrihaDi7cf6fPa2tbgw==",
+      "dev": true,
+      "requires": {
+        "@types/caseless": "*",
+        "@types/node": "*",
+        "@types/tough-cookie": "*",
+        "form-data": "^2.5.0"
+      }
+    },
     "@types/semver": {
       "version": "7.1.0",
       "resolved": "https://registry.npmjs.org/@types/semver/-/semver-7.1.0.tgz",
@@ -615,6 +678,12 @@
         "@types/node": "*"
       }
     },
+    "@types/tough-cookie": {
+      "version": "2.3.6",
+      "resolved": "https://registry.npmjs.org/@types/tough-cookie/-/tough-cookie-2.3.6.tgz",
+      "integrity": "sha512-wHNBMnkoEBiRAd3s8KTKwIuO9biFtTf0LehITzBhSco+HQI0xkXZbLOD55SW3Aqw3oUkHstkm5SPv58yaAdFPQ==",
+      "dev": true
+    },
     "@types/unist": {
       "version": "2.0.3",
       "resolved": "https://registry.npmjs.org/@types/unist/-/unist-2.0.3.tgz",
diff --git a/package.json b/package.json
index cc855186..3791a1fd 100644
--- a/package.json
+++ b/package.json
@@ -176,6 +176,13 @@
   },
   "devDependencies": {
     "@types/adm-zip": "^0.4.32",
+    "@types/auto-launch": "^5.0.1",
+    "@types/backoff": "^2.5.1",
+    "@types/electron-spellchecker": "^1.1.2",
+    "@types/escape-html": "0.0.20",
+    "@types/fs-extra": "^8.1.0",
+    "@types/i18n": "^0.8.6",
+    "@types/request": "^2.48.4",
     "@typescript-eslint/eslint-plugin": "^2.22.0",
     "@typescript-eslint/parser": "^2.22.0",
     "@vitalets/google-translate-api": "^3.0.0",
diff --git a/typings.d.ts b/typings.d.ts
index f3a3df3f..61953957 100644
--- a/typings.d.ts
+++ b/typings.d.ts
@@ -1,19 +1,6 @@
-declare module 'adm-zip';
-declare module 'auto-launch';
-declare module 'is-online';
-declare module 'request';
-declare module 'semver';
 declare module '@electron-elements/send-feedback';
 declare module 'node-mac-notifier';
-declare module 'electron-connect';
-declare module 'electron-is-dev';
-declare module 'electron-spellchecker';
-declare module 'escape-html';
-declare module 'fs-extra';
 declare module 'wurl';
-declare module 'i18n';
-declare module 'backoff';
-declare module 'crypto-random-string';
 
 interface PageParamsObject {
   realm_uri: string;