Merge pull request 'write script to use env variables' (#100) from andy/start-script into master

Reviewed-on: railbird/railbird-mobile#100

package.json

@@ -7,8 +7,8 @@
 		"start:android": "expo start --android",
 		"start:ios": "expo start --ios",
 		"android": "expo run:android",
-		"android:dev": "NODE_ENV=development expo run:android",
+		"android:dev": "node ./start.js development",
-		"android:prod": "NODE_ENV=production expo run:android",
+		"android:test": "node ./start.js test",
 		"ios": "expo run:ios",
 		"ios:dev": "NODE_ENV=development expo run:ios",
 		"ios:prod": "NODE_ENV=production expo run:ios",

start.js

@@ -0,0 +1,16 @@
+const { spawn } = require("child_process");
+
+const envName = process.argv[2];
+
+const expoStart = spawn("expo", ["start", "-c"]);
+
+expoStart.stdout.on("data", (data) => {
+  if (data.toString().includes("Logs for your project will appear below")) {
+    expoStart.kill("SIGINT");
+  }
+});
+
+expoStart.on("close", () => {
+  const env = { ...process.env, NODE_ENV: envName };
+  spawn("expo", ["run:android"], { env, stdio: "inherit" });
+});