fix: always close file handles to stdout/stderr logs (#259)

Author: Junyan

src/chrome-launcher.ts

@@ -415,16 +415,16 @@ class Launcher {
   }
 
   destroyTmp() {
-    // Only clean up the tmp dir if we created it.
-    if (this.userDataDir === undefined || this.opts.userDataDir !== undefined) {
-      return;
-    }
-
     if (this.outFile) {
       this.fs.closeSync(this.outFile);
       delete this.outFile;
     }
 
+    // Only clean up the tmp dir if we created it.
+    if (this.userDataDir === undefined || this.opts.userDataDir !== undefined) {
+      return;
+    }
+
     if (this.errFile) {
       this.fs.closeSync(this.errFile);
       delete this.errFile;