Initial commit

types/ServerMessage.ts

@@ -0,0 +1,59 @@
+export enum MessageType {
+  ACK = "0",
+  TEXT = "1",
+}
+
+export type ServerMessage = {
+  type: string;
+  date: number;
+};
+export function isServerMessage(obj: unknown): obj is ServerMessage {
+  if (typeof obj !== "object") return false;
+  if (obj === null) return false;
+  if (
+    !Object.hasOwnProperty.call(obj, "type") ||
+    typeof (obj as { type: unknown }).type !== "string"
+  ) {
+    return false;
+  }
+  if (
+    !Object.hasOwnProperty.call(obj, "date") ||
+    typeof (obj as { date: unknown }).date !== "number"
+  ) {
+    return false;
+  }
+
+  return true;
+}
+
+export type TextMessage = ServerMessage & {
+  type: MessageType.TEXT;
+  author: string;
+  content: string;
+};
+export function isTextMessage(obj: unknown): obj is TextMessage {
+  if (!isServerMessage(obj)) return false;
+  if (obj.type !== MessageType.TEXT) return false;
+  if (
+    !Object.hasOwnProperty.call(obj, "author") ||
+    typeof (obj as ServerMessage & { author: unknown }).author !== "string"
+  ) {
+    return false;
+  }
+  if (
+    !Object.hasOwnProperty.call(obj, "author") ||
+    typeof (obj as ServerMessage & { content: unknown }).content !== "string"
+  ) {
+    return false;
+  }
+  return true;
+}
+
+export type AckMessage = ServerMessage & {
+  type: MessageType.ACK;
+};
+export function isAckMessage(obj: unknown): obj is AckMessage {
+  if (!isServerMessage(obj)) return false;
+  if (obj.type !== MessageType.ACK) return false;
+  return true;
+}