feat: resize when writting byte by index.

Author: ghosind

src/dynamicBuffer.ts

@@ -1790,11 +1790,14 @@ export class DynamicBuffer {
    * @param offset The position to write data.
    */
   private writeByte(data: any, offset: number) {
-    if (!this.buffer || this.length === 0 || offset >= this.length) {
-      return;
-    }
+    this.ensureSize(offset + 1);
 
+    // @ts-ignore
     this.buffer[offset] = data;
+
+    if (offset >= this.used) {
+      this.used = offset + 1;
+    }
   }
 
   /**

test/write.spec.ts

@@ -14,8 +14,8 @@ describe('Set by index tests', () => {
     buffer[-1] = 33; // !
     assert.equal(buffer.toString(), 'Hello world');
 
-    buffer[buffer.length] = 33; // !
-    assert.equal(buffer.toString(), 'Hello world');
+    buffer[buffer.length] = 33; // auto-resize
+    assert.equal(buffer.toString(), 'Hello world!');
   });
 });