update

package/node_modules/@npmcli/run-script/lib/signal-manager.js

@@ -0,0 +1,50 @@
+const runningProcs = new Set()
+let handlersInstalled = false
+
+const forwardedSignals = [
+  'SIGINT',
+  'SIGTERM',
+]
+
+// no-op, this is so receiving the signal doesn't cause us to exit immediately
+// instead, we exit after all children have exited when we re-send the signal
+// to ourselves. see the catch handler at the bottom of run-script-pkg.js
+const handleSignal = signal => {
+  for (const proc of runningProcs) {
+    proc.kill(signal)
+  }
+}
+
+const setupListeners = () => {
+  for (const signal of forwardedSignals) {
+    process.on(signal, handleSignal)
+  }
+  handlersInstalled = true
+}
+
+const cleanupListeners = () => {
+  if (runningProcs.size === 0) {
+    for (const signal of forwardedSignals) {
+      process.removeListener(signal, handleSignal)
+    }
+    handlersInstalled = false
+  }
+}
+
+const add = proc => {
+  runningProcs.add(proc)
+  if (!handlersInstalled) {
+    setupListeners()
+  }
+
+  proc.once('exit', () => {
+    runningProcs.delete(proc)
+    cleanupListeners()
+  })
+}
+
+module.exports = {
+  add,
+  handleSignal,
+  forwardedSignals,
+}