Extract auto-reply helpers into modules

src/twilio/typing.ts

@@ -0,0 +1,43 @@
+import { warn, isVerbose, logVerbose } from "../globals.js";
+import type { RuntimeEnv } from "../runtime.js";
+
+type TwilioRequestOptions = {
+	method: "get" | "post";
+	uri: string;
+	params?: Record<string, string | number>;
+	form?: Record<string, string>;
+	body?: unknown;
+	contentType?: string;
+};
+
+type TwilioRequester = {
+	request: (options: TwilioRequestOptions) => Promise<unknown>;
+};
+
+export async function sendTypingIndicator(
+	client: TwilioRequester,
+	messageSid?: string,
+	runtime: RuntimeEnv,
+) {
+	// Best-effort WhatsApp typing indicator (public beta as of Nov 2025).
+	if (!messageSid) {
+		logVerbose("Skipping typing indicator: missing MessageSid");
+		return;
+	}
+	try {
+		await client.request({
+			method: "post",
+			uri: "https://messaging.twilio.com/v2/Indicators/Typing.json",
+			form: {
+				messageId: messageSid,
+				channel: "whatsapp",
+			},
+		});
+		logVerbose(`Sent typing indicator for inbound ${messageSid}`);
+	} catch (err) {
+		if (isVerbose()) {
+			runtime.error(warn("Typing indicator failed (continuing without it)"));
+			runtime.error(err as Error);
+		}
+	}
+}