Switch from ts-node to tsc-watch for faster watch restarts; move format npm script to project root

backend/start-dev.js

@@ -0,0 +1,18 @@
+/**
+ * This file starts the bot and api processes in tandem.
+ * Used with tsc-watch for restarting on watch.
+ */
+
+const childProcess = require("child_process");
+
+const cmd = process.platform === "win32"
+  ? "npm.cmd"
+  : "npm";
+
+childProcess.spawn(cmd, ["run", "start-bot-dev"], {
+  stdio: [process.stdin, process.stdout, process.stderr],
+});
+
+childProcess.spawn(cmd, ["run", "start-api-dev"], {
+  stdio: [process.stdin, process.stdout, process.stderr],
+});