fs: harden validation of start option in createWriteStream

PR-URL: https://github.com/nodejs/node/pull/25579
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Sakthipriyan Vairamani <thechargingvolcano@gmail.com>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>

1 files changed, 1 insertions, 7 deletions

diff --git a/lib/internal/fs/streams.js b/lib/internal/fs/streams.js
index 501c9ee4d2..7174990ebb 100644
--- a/lib/internal/fs/streams.js
+++ b/lib/internal/fs/streams.js
@@ -243,13 +243,7 @@ function WriteStream(path, options) {
   this.closed = false;
 
   if (this.start !== undefined) {
-    if (typeof this.start !== 'number') {
-      throw new ERR_INVALID_ARG_TYPE('start', 'number', this.start);
-    }
-    if (this.start < 0) {
-      const errVal = `{start: ${this.start}}`;
-      throw new ERR_OUT_OF_RANGE('start', '>= 0', errVal);
-    }
+    checkPosition(this.start, 'start');
 
     this.pos = this.start;
   }