Ao rodar o comando ionic build android não dá nenhum erro, mas não gera a pasta build dentro de platforms/android. O resultado do comando rodado é:
MacBook-Pro-de-Thiago:aluraCar thiagooliveira$ ionic build android
ionic-hello-world@ ionic:build /Users/thiagooliveira/Desktop/aluraCar ionic-app-scripts build
[23:49:10] ionic-app-scripts 1.0.0 [23:49:10] build dev started ... [23:49:10] clean started ... [23:49:10] clean finished in 7 ms [23:49:10] copy started ... [23:49:10] transpile started ... [23:49:14] transpile finished in 3.56 s [23:49:14] webpack started ... [23:49:14] copy finished in 3.75 s [23:49:22] webpack finished in 8.08 s [23:49:22] sass started ... [23:49:23] sass finished in 945 ms [23:49:23] build dev finished in 12.62 s MacBook-Pro-de-Thiago:aluraCar thiagooliveira$