add sync node example

bindings/javascript/examples/sync-node/index.mjs

@@ -0,0 +1,40 @@
+import { connect } from "@tursodatabase/sync";
+
+const db = await connect({
+    path: "local.db", // local path to store database
+    authToken: process.env.TURSO_AUTH_TOKEN, // Turso Cloud auth token
+    url: process.env.TURSO_DATABASE_URL, // Turso Cloud database url
+    longPollTimeoutMs: 0, // optional long-polling interval for pull operation; useful in case when pull called in a loop
+});
+
+// execute multiple SQL statements with exec(...)
+await db.exec(`
+    CREATE TABLE IF NOT EXISTS guestbook (comment TEXT, created_at DEFAULT (unixepoch()));
+    CREATE INDEX IF NOT EXISTS guestbook_idx ON guestbook (created_at);
+`);
+
+// use prepared statements and bind args to placeholders later
+const select1 = db.prepare(`SELECT * FROM guestbook ORDER BY created_at DESC LIMIT ?`);
+// use all(...) or get(...) methods to get all or one row from the query
+console.info(await select1.all([5]))
+
+try {
+    // pull new changes from the remote
+    await db.pull();
+} catch (e) {
+    console.error('pull failed', e);
+}
+
+const insert = db.prepare(`INSERT INTO guestbook(comment) VALUES (?)`);
+// use run(...) method if query only need to be executed till completion
+await insert.run([`hello, turso at ${Math.floor(Date.now() / 1000)}`]);
+
+const select2 = db.prepare(`SELECT * FROM guestbook ORDER BY created_at DESC LIMIT ?`);
+console.info(await select2.all([5]))
+
+try {
+    // push local changes to the remote
+    await db.push();
+} catch (e) {
+    console.error('pull failed', e);
+}