Start improving build scripts

packages/core/build.sh

@@ -1,14 +1,28 @@
 #!/bin/bash
 
 set -e
+set -m
 
 ## Delete the dist folder
 rm -rf dist
 
-## Get our basic build in place
-tsc -p tsconfig.esm.json & 
-tsc -p tsconfig.cjs.json & 
-wait
+run_in_parallel() {
+  local commands=("$@")
+  local pids=()
+
+  # Start the processes in the background and store their PIDs
+  for cmd in "${commands[@]}"; do
+    $cmd &
+    pids+=($!)
+  done
+
+  # Wait for all processes and exit if any of them fail
+  for pid in "${pids[@]}"; do
+    wait $pid || exit $?
+  done
+}
+
+run_in_parallel "tsc -p tsconfig.esm.json" "tsc -p tsconfig.cjs.json"
 
 ## Now we need to run linaria on the esm build
 linaria -r dist/esm/ -m es2015 -o dist/esm/ dist/esm/**/*.js