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docs/snippets/wasm/plugins/plugin_extractor.md

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+# Custom Plugin Usage Pattern
+
+Demonstrate the pattern for using registered plugins during document extraction.
+
+```typescript title="WASM"
+import init, { extractBytes, registerPostProcessor } from "kreuzberg-wasm";
+
+await init();
+
+// Register a custom post-processor
+const customProcessor = {
+  processingStage: () => "post-extraction",
+  process: (result) => {
+    console.log("Post-processor: enriching extraction result");
+    return {
+      ...result,
+      metadata: {
+        ...result.metadata,
+        enriched: true,
+        processorApplied: "customProcessor",
+      },
+    };
+  },
+};
+
+registerPostProcessor(customProcessor);
+
+// Extract document with registered plugin
+async function extractWithPlugins(fileBytes, mimeType) {
+  const config = {
+    ocr: null,
+    chunking: null,
+    enableQualityProcessing: false,
+  };
+
+  // Extraction automatically applies registered post-processors
+  const result = await extractBytes(fileBytes, mimeType, config);
+
+  console.log("Extraction complete");
+  console.log("Plugins applied:", result.metadata?.enriched);
+
+  return result;
+}
+
+// Usage
+const pdfBytes = new Uint8Array([
+  /* PDF content */
+]);
+const result = await extractWithPlugins(pdfBytes, "application/pdf");
+console.log("Final result:", result);
+```
+
+The extraction pipeline automatically applies all registered plugins in the correct order.