fix(exec): wait for the child process to close

.changeset/good-ideas-yawn.md

@@ -0,0 +1,5 @@
+---
+"@pnpm/plugin-commands-script-runners": patch
+---
+
+Fix waiting for closed child process.

exec/plugin-commands-script-runners/src/exec.ts

@@ -281,11 +281,14 @@ export async function handler (
             }
             child.stdout!.on('data', logFn('stdout'))
             child.stderr!.on('data', logFn('stderr'))
-            void child.once('close', exitCode => {
-              lifecycleLogger.debug({
-                ...lifecycleOpts,
-                exitCode: exitCode ?? 1,
-                optional: false,
+            await new Promise<void>((resolve) => {
+              void child.once('close', exitCode => {
+                lifecycleLogger.debug({
+                  ...lifecycleOpts,
+                  exitCode: exitCode ?? 1,
+                  optional: false,
+                })
+                resolve()
               })
             })
             await child