Re-add and format Node Luma examples

Author: hollyabrams

official/docs/node/current/luma/buy.js

@@ -0,0 +1,10 @@
+const EasyPost = require("@easypost/api");
+
+const api = new EasyPost("EASYPOST_API_KEY");
+
+(async () => {
+  const shipment = await api.Shipment.retrieve("shp_...");
+  await shipment.buy(shipment.lowestRate());
+
+  console.log(shipment);
+})();

official/docs/node/current/luma/one-call-buy.js

@@ -0,0 +1,40 @@
+const EasyPost = require("@easypost/api");
+
+const api = new EasyPost("EASYPOST_API_KEY");
+
+(async () => {
+  const shipment = await api.Shipment.create({
+    to_address: {
+      name: "Dr. Steve Brule",
+      street1: "5744 Silverton Ave",
+      city: "McKinney",
+      state: "TX",
+      zip: "75070",
+      country: "US",
+      phone: "8573875756",
+      email: "dr_steve_brule@gmail.com",
+    },
+    from_address: {
+      name: "EasyPost",
+      street1: "417 Montgomery Street",
+      street2: "5th Floor",
+      city: "San Francisco",
+      state: "CA",
+      zip: "94104",
+      country: "US",
+      phone: "4153334445",
+      email: "support@easypost.com",
+    },
+    parcel: {
+      length: 20.2,
+      width: 10.9,
+      height: 5,
+      weight: 65.9,
+    },
+    carrier_accounts: ["ca_1", "ca_2"],
+    service: "Priority",
+    carrier: "USPS",
+  });
+
+  console.log(shipment);
+})();

official/docs/node/current/luma/promise.js

@@ -0,0 +1,40 @@
+const EasyPostClient = require("@easypost/api");
+
+const client = new EasyPostClient("EASYPOST_API_KEY");
+
+(async () => {
+  const promise = await client.Shipment.lumaPromise({
+    to_address: {
+      name: "Dr. Steve Brule",
+      street1: "5744 Silverton Ave",
+      city: "McKinney",
+      state: "TX",
+      zip: "75070",
+      country: "US",
+      phone: "8573875756",
+      email: "dr_steve_brule@gmail.com",
+    },
+    from_address: {
+      name: "EasyPost",
+      street1: "417 Montgomery Street",
+      street2: "5th Floor",
+      city: "San Francisco",
+      state: "CA",
+      zip: "94104",
+      country: "US",
+      phone: "4153334445",
+      email: "support@easypost.com",
+    },
+    parcel: {
+      length: 20.2,
+      width: 10.9,
+      height: 5,
+      weight: 65.9,
+    },
+    ruleset_name: "test_ruleset_deliver_by_2",
+    planned_ship_date: "2025-07-03",
+    deliver_by_date: "2025-07-06",
+  });
+
+  console.log(promise);
+})();