refactor(misskey-js): enable exactOptionalPropertyTypes (#14203)

* refactor(misskey-js): enable exactOptionalPropertyTypes

* refactor(misskey-js): fix error where is appeared by enabling

packages/misskey-js/src/streaming.ts

@@ -291,8 +291,10 @@ export abstract class Connection<Channel extends AnyOf<Channels> = any> extends
 
 		this.stream = stream;
 		this.channel = channel;
+		if (name !== undefined) {
 			this.name = name;
 		}
+	}
 
 	public send<T extends keyof Channel['receives']>(type: T, body: Channel['receives'][T]): void {
 		this.stream.send('ch', {

packages/misskey-js/tsconfig.json

@@ -15,6 +15,7 @@
 		"experimentalDecorators": true,
 		"noImplicitReturns": true,
 		"esModuleInterop": true,
+		"exactOptionalPropertyTypes": true,
 		"typeRoots": [
 			"./node_modules/@types"
 		],