Add log message when killing subprocess

packages/scripts/src/Subprocess.ts

@@ -36,15 +36,14 @@ export class Subprocess {
           reject(new Error(`"${this.command}" exited with code ${code}`))
         }
       })
-      let exited = false
-      subprocess.on('exit', () => exited = true)
       subprocess.on('error', reject)
 
-      process.on('exit', () => {
-        if (!exited) {
-          subprocess.kill()
-        }
-      })
+      const kill = () => {
+        process.stderr.write(`Killing ${this.command} ${this.args.join(' ')}\n`)
+        subprocess.kill()
+      }
+      process.on('exit', kill)
+      subprocess.on('exit', () => process.removeListener('exit', kill))
     })
   }
 }