add node express & postgresql starter template

web/other/node-express-ts-postgres-starter/src/db.ts

@@ -0,0 +1,39 @@
+import postgres from "postgres";
+
+const username = process.env.POSTGRES_USER;
+const password = process.env.POSTGRES_PASSWORD;
+const database = process.env.POSTGRES_DB;
+const host = process.env.POSTGRES_HOST;
+const port = process.env.POSTGRES_PORT;
+
+if (!username) {
+  throw new Error("POSTGRES_USER is not set");
+}
+
+if (!password) {
+  throw new Error("POSTGRES_PASSWORD is not set");
+}
+
+if (!database) {
+  throw new Error("POSTGRES_DB is not set");
+}
+
+if (!host) {
+  throw new Error("POSTGRES_HOST is not set");
+}
+
+if (!port) {
+  throw new Error("POSTGRES_PORT is not set");
+}
+
+if (isNaN(parseInt(port))) {
+  throw new Error("POSTGRES_PORT is not a number");
+}
+
+export const sql = postgres({
+  username,
+  password,
+  database,
+  host,
+  port: parseInt(port),
+});