fix(std/io): BufWriter/StringWriter bug (#6247)

1 files changed, 2 insertions, 0 deletions

diff --git a/std/io/bufio.ts b/std/io/bufio.ts
index 4ebec13e1..e4759dcb7 100644
--- a/std/io/bufio.ts
+++ b/std/io/bufio.ts
@@ -486,6 +486,7 @@ export class BufWriter extends AbstractBufBase implements Writer {
 
     this.checkBytesWritten(numBytesWritten);
 
+    this.buf = new Uint8Array(this.buf.length);
     this.usedBufferBytes = 0;
   }
 
@@ -580,6 +581,7 @@ export class BufWriterSync extends AbstractBufBase implements WriterSync {
 
     this.checkBytesWritten(numBytesWritten);
 
+    this.buf = new Uint8Array(this.buf.length);
     this.usedBufferBytes = 0;
   }