fix: Wait for CSV file stream

* Stream behaviour was introduced with forcedotcom#617
* We have been waiting for the csvTransformStream only
* FileStream was not fully flushed so we missed CSV records forcedotcom#618

src/modules/components/common_components/common.ts

@@ -868,18 +868,21 @@ export class Common {
         }
       }
 
+      const fileStream = fs.createWriteStream(filePath);
       const csvTransformStream = new CsvTransformStream();
-      csvTransformStream.pipe(fs.createWriteStream(filePath));
+
+      csvTransformStream.pipe(fileStream);
 
       for(const record of array) {
         csvTransformStream.write(record);
       }
 
       csvTransformStream.end();
 
+      // Wait for file to be fully written #618
       return new Promise((resolve, reject) => {
-        csvTransformStream.on('finish', resolve)
-        csvTransformStream.on('error', reject)
+        fileStream.on('finish', resolve);
+        fileStream.on('error', reject);
       })
     } catch (ex) {
       throw new CommandExecutionError(this.logger.getResourceString(RESOURCES.writingCsvFileError, filePath, ex.message));