Add a way to purge temp buffer data

package.json

@@ -1,6 +1,6 @@
 {
   "name": "warcio",
-  "version": "2.4.2",
+  "version": "2.4.3",
   "keywords": [
     "WARC",
     "web archiving"

src/lib/warcserializer.ts

@@ -27,6 +27,7 @@ export type WARCSerializerOpts = {
 export abstract class BaseSerializerBuffer {
   abstract write(chunk: Uint8Array): void;
   abstract readAll(): AsyncIterable<Uint8Array>;
+  abstract purge(): void;
 }
 
 // ===========================================================================
@@ -42,6 +43,10 @@ export class SerializerInMemBuffer extends BaseSerializerBuffer {
       yield buff;
     }
   }
+
+  purge() {
+    this.buffers = [];
+  }
 }
 
 // ===========================================================================

src/node/warcserializer.ts

@@ -75,7 +75,14 @@ export class TempFileBuffer extends warcserializer.SerializerInMemBuffer {
       yield buff;
     }
 
-    await unlink(this.filename);
+    await this.purge();
+  }
+
+  override async purge() {
+    if (this.filename) {
+      await unlink(this.filename);
+      this.filename = "";
+    }
   }
 }