tsc: compat with v3.8.3

.eslintrc.json

@@ -9,6 +9,12 @@
 		"plugin:@typescript-eslint/recommended"
 	],
 	"rules": {
+		"@typescript-eslint/ban-ts-comment": [
+			"error",
+			{
+				"ts-ignore": "allow-with-description"
+			}
+		],
 		"@typescript-eslint/no-explicit-any": [
 			"error",
 			{

package.json

@@ -33,7 +33,15 @@
 		"smtp-server": "3.10.0",
 		"ts-node": "10.7.0",
 		"tslib": "2.3.1",
-		"typescript": "4.6.2"
+		"typescript": "3.8.3"
+	},
+	"peerDependencies": {
+		"typescript": ">=3.8.3"
+	},
+	"peerDependenciesMeta": {
+		"typescript": {
+			"optional": true
+		}
 	},
 	"resolutions": {
 		"nodemailer": "6.7.2"

smtp/client.ts

@@ -47,9 +47,9 @@ export class SMTPClient {
 	 * @param {MessageCallback} callback .
 	 * @returns {void}
 	 */
-	public send<T extends Message | MessageHeaders>(
-		msg: T,
-		callback: MessageCallback<T>
+	public send(
+		msg: Message | MessageHeaders,
+		callback: MessageCallback<Message | MessageHeaders>
 	) {
 		const message =
 			msg instanceof Message

test/client.ts

@@ -87,7 +87,7 @@ test('client invokes callback exactly once for invalid connection', async (t) =>
 					incrementCounter();
 				}
 			});
-			// @ts-expect-error the error event is only accessible from the protected socket property
+			// @ts-ignore the error event is only accessible from the protected socket property
 			invalidClient.smtp.sock.once('error', () => {
 				if (counter === 1) {
 					resolve();
@@ -349,7 +349,7 @@ test('client send can have result awaited when promisified', async (t) => {
 	};
 
 	try {
-		const message = await sendAsync(new Message(msg));
+		const message = (await sendAsync(new Message(msg))) as Message;
 		t.true(message instanceof Message);
 		t.like(message, {
 			alternative: null,

test/message.ts

@@ -10,7 +10,7 @@ import { MessageHeaders } from '../smtp/message';
 
 // eslint-disable-next-line no-var
 var __dirname: string;
-// @ts-expect-error compat hack for node 10
+// @ts-ignore compat hack for node 10
 if (__dirname == null) {
 	__dirname = join(process.cwd(), 'test');
 }

yarn.lock

@@ -2682,10 +2682,10 @@ typedarray-to-buffer@^3.1.5:
   dependencies:
     is-typedarray "^1.0.0"
 
-typescript@4.6.2:
-  version "4.6.2"
-  resolved "https://registry.npmjs.org/typescript/-/typescript-4.6.2.tgz#fe12d2727b708f4eef40f51598b3398baa9611d4"
-  integrity sha512-HM/hFigTBHZhLXshn9sN37H085+hQGeJHJ/X7LpBWLID/fbc2acUMfU+lGD98X81sKP+pFa9f0DZmCwB9GnbAg==
+typescript@3.8.3:
+  version "3.8.3"
+  resolved "https://registry.npmjs.org/typescript/-/typescript-3.8.3.tgz#409eb8544ea0335711205869ec458ab109ee1061"
+  integrity sha512-MYlEfn5VrLNsgudQTVJeNaQFUAI7DkhnOjdpAp4T+ku1TfQClewlbSuTVHiA+8skNBgaf02TL/kLOvig4y3G8w==
 
 uc.micro@^1.0.1:
   version "1.0.6"