Add hello world code

main.ts

@@ -0,0 +1,61 @@
+import * as config from "./config.json";
+
+const sdk = require("matrix-bot-sdk");
+
+const {
+  homeserverUrl,
+  accessToken,
+  storageLocation,
+  cryptoFolderLocation,
+} = config;
+
+const {
+  MatrixClient,
+  SimpleFsStorageProvider,
+  RustSdkCryptoStorageProvider,
+  AutojoinRoomsMixin
+} = sdk;
+
+// In order to make sure the bot doesn't lose its state between restarts, we'll give it a place to cache
+// any information it needs to. You can implement your own storage provider if you like, but a JSON file
+// will work fine for this example.
+const storage = new SimpleFsStorageProvider(storageLocation);
+const cryptoProvider = new RustSdkCryptoStorageProvider(cryptoFolderLocation);
+
+const client = new MatrixClient(homeserverUrl, accessToken, storage, cryptoProvider);
+AutojoinRoomsMixin.setupOnClient(client);
+
+// Before we start the bot, register our command handler
+client.on("room.message", handleCommand);
+
+// Now that everything is set up, start the bot. This will start the sync loop and run until killed.
+client.start().then(() => {
+  console.log("Bot started!")
+});
+
+interface Event {
+  content: {
+    msgtype: string,
+    body: string,
+  };
+  sender: string,
+}
+
+// This is the command handler we registered a few lines up
+async function handleCommand(roomId: string, event: Event) {
+  console.log("event:", event);
+  // Don't handle unhelpful events (ones that aren't text messages, are redacted, or sent by us)
+  if (event.content?.msgtype !== 'm.text') return;
+  if (event.sender === await client.getUserId()) return;
+
+  // Check to ensure that the `!hello` command is being run
+  const body = event.content.body;
+  if (!body?.startsWith("!hello")) return;
+
+  // Now that we've passed all the checks, we can actually act upon the command
+  await client.setTyping(roomId, true);
+  setTimeout(async () => {
+    await client.setTyping(roomId, false);
+    await client.replyNotice(roomId, event, "Hello world!");
+  }, 1500);
+}