diff --git a/packages/ipfs-unixfs-importer/package.json b/packages/ipfs-unixfs-importer/package.json
index cb8af317..0c08d9ef 100644
--- a/packages/ipfs-unixfs-importer/package.json
+++ b/packages/ipfs-unixfs-importer/package.json
@@ -80,7 +80,7 @@
     "hamt-sharding": "^3.0.6",
     "interface-blockstore": "^5.2.10",
     "interface-store": "^5.1.8",
-    "ipfs-unixfs": "^11.0.0",
+    "ipfs-unixfs": "^11.1.4",
     "it-all": "^3.0.4",
     "it-batch": "^3.0.4",
     "it-first": "^3.0.4",
diff --git a/packages/ipfs-unixfs-importer/src/dag-builder/dir.ts b/packages/ipfs-unixfs-importer/src/dag-builder/dir.ts
index a29675f6..eda5c9dd 100644
--- a/packages/ipfs-unixfs-importer/src/dag-builder/dir.ts
+++ b/packages/ipfs-unixfs-importer/src/dag-builder/dir.ts
@@ -1,7 +1,11 @@
 import { encode, prepare } from '@ipld/dag-pb'
 import { UnixFS } from 'ipfs-unixfs'
 import { persist } from '../utils/persist.js'
-import type { Directory, InProgressImportResult, WritableStorage } from '../index.js'
+import type {
+  Directory,
+  InProgressImportResult,
+  WritableStorage
+} from '../index.js'
 import type { Version } from 'multiformats/cid'
 
 export interface DirBuilderOptions {
@@ -9,7 +13,11 @@ export interface DirBuilderOptions {
   signal?: AbortSignal
 }
 
-export const dirBuilder = async (dir: Directory, blockstore: WritableStorage, options: DirBuilderOptions): Promise<InProgressImportResult> => {
+export const defaultDirBuilder = async (
+  dir: Directory,
+  blockstore: WritableStorage,
+  options: DirBuilderOptions
+): Promise<InProgressImportResult> => {
   const unixfs = new UnixFS({
     type: 'directory',
     mtime: dir.mtime,
diff --git a/packages/ipfs-unixfs-importer/src/dag-builder/file.ts b/packages/ipfs-unixfs-importer/src/dag-builder/file.ts
index 41d94ca0..e100229e 100644
--- a/packages/ipfs-unixfs-importer/src/dag-builder/file.ts
+++ b/packages/ipfs-unixfs-importer/src/dag-builder/file.ts
@@ -4,7 +4,14 @@ import parallelBatch from 'it-parallel-batch'
 import * as rawCodec from 'multiformats/codecs/raw'
 import { CustomProgressEvent } from 'progress-events'
 import { persist } from '../utils/persist.js'
-import type { BufferImporter, File, InProgressImportResult, WritableStorage, SingleBlockImportResult, ImporterProgressEvents } from '../index.js'
+import type {
+  BufferImporter,
+  File,
+  InProgressImportResult,
+  WritableStorage,
+  SingleBlockImportResult,
+  ImporterProgressEvents
+} from '../index.js'
 import type { FileLayout, Reducer } from '../layout/index.js'
 import type { CID, Version } from 'multiformats/cid'
 import type { ProgressOptions, ProgressEvent } from 'progress-events'
@@ -14,11 +21,18 @@ interface BuildFileBatchOptions {
   blockWriteConcurrency: number
 }
 
-async function * buildFileBatch (file: File, blockstore: WritableStorage, options: BuildFileBatchOptions): AsyncGenerator<InProgressImportResult> {
+async function * buildFileBatch (
+  file: File,
+  blockstore: WritableStorage,
+  options: BuildFileBatchOptions
+): AsyncGenerator<InProgressImportResult> {
   let count = -1
   let previous: SingleBlockImportResult | undefined
 
-  for await (const entry of parallelBatch(options.bufferImporter(file, blockstore), options.blockWriteConcurrency)) {
+  for await (const entry of parallelBatch(
+    options.bufferImporter(file, blockstore),
+    options.blockWriteConcurrency
+  )) {
     count++
 
     if (count === 0) {
@@ -29,7 +43,7 @@ async function * buildFileBatch (file: File, blockstore: WritableStorage, option
       }
 
       continue
-    } else if (count === 1 && (previous != null)) {
+    } else if (count === 1 && previous != null) {
       // we have the second block of a multiple block import so yield the first
       yield {
         ...previous,
@@ -63,8 +77,10 @@ export interface LayoutLeafProgress {
   path?: string
 }
 
-export type ReducerProgressEvents =
-  ProgressEvent<'unixfs:importer:progress:file:layout', LayoutLeafProgress>
+export type ReducerProgressEvents = ProgressEvent<
+'unixfs:importer:progress:file:layout',
+LayoutLeafProgress
+>
 
 interface ReduceOptions extends ProgressOptions<ImporterProgressEvents> {
   reduceSingleLeafToSelf: boolean
@@ -76,13 +92,24 @@ function isSingleBlockImport (result: any): result is SingleBlockImportResult {
   return result.single === true
 }
 
-const reduce = (file: File, blockstore: WritableStorage, options: ReduceOptions): Reducer => {
+const reduce = (
+  file: File,
+  blockstore: WritableStorage,
+  options: ReduceOptions
+): Reducer => {
   const reducer: Reducer = async function (leaves) {
-    if (leaves.length === 1 && isSingleBlockImport(leaves[0]) && options.reduceSingleLeafToSelf) {
+    if (
+      leaves.length === 1 &&
+      isSingleBlockImport(leaves[0]) &&
+      options.reduceSingleLeafToSelf
+    ) {
       const leaf = leaves[0]
       let node: Uint8Array | PBNode = leaf.block
 
-      if (isSingleBlockImport(leaf) && (file.mtime !== undefined || file.mode !== undefined)) {
+      if (
+        isSingleBlockImport(leaf) &&
+        (file.mtime !== undefined || file.mode !== undefined)
+      ) {
         // only one leaf node which is a raw leaf - we have metadata so convert it into a
         // UnixFS entry otherwise we'll have nowhere to store the metadata
         leaf.unixfs = new UnixFS({
@@ -103,10 +130,15 @@ const reduce = (file: File, blockstore: WritableStorage, options: ReduceOptions)
         leaf.size = BigInt(leaf.block.length)
       }
 
-      options.onProgress?.(new CustomProgressEvent<LayoutLeafProgress>('unixfs:importer:progress:file:layout', {
-        cid: leaf.cid,
-        path: leaf.originalPath
-      }))
+      options.onProgress?.(
+        new CustomProgressEvent<LayoutLeafProgress>(
+          'unixfs:importer:progress:file:layout',
+          {
+            cid: leaf.cid,
+            path: leaf.originalPath
+          }
+        )
+      )
 
       return {
         cid: leaf.cid,
@@ -125,12 +157,16 @@ const reduce = (file: File, blockstore: WritableStorage, options: ReduceOptions)
     })
 
     const links: PBLink[] = leaves
-      .filter(leaf => {
+      .filter((leaf) => {
         if (leaf.cid.code === rawCodec.code && leaf.size > 0) {
           return true
         }
 
-        if ((leaf.unixfs != null) && (leaf.unixfs.data == null) && leaf.unixfs.fileSize() > 0n) {
+        if (
+          leaf.unixfs != null &&
+          leaf.unixfs.data == null &&
+          leaf.unixfs.fileSize() > 0n
+        ) {
           return true
         }
 
@@ -148,7 +184,7 @@ const reduce = (file: File, blockstore: WritableStorage, options: ReduceOptions)
           }
         }
 
-        if ((leaf.unixfs == null) || (leaf.unixfs.data == null)) {
+        if (leaf.unixfs == null || leaf.unixfs.data == null) {
           // node is an intermediate node
           f.addBlockSize(leaf.unixfs?.fileSize() ?? 0n)
         } else {
@@ -170,16 +206,24 @@ const reduce = (file: File, blockstore: WritableStorage, options: ReduceOptions)
     const block = encode(prepare(node))
     const cid = await persist(block, blockstore, options)
 
-    options.onProgress?.(new CustomProgressEvent<LayoutLeafProgress>('unixfs:importer:progress:file:layout', {
-      cid,
-      path: file.originalPath
-    }))
+    options.onProgress?.(
+      new CustomProgressEvent<LayoutLeafProgress>(
+        'unixfs:importer:progress:file:layout',
+        {
+          cid,
+          path: file.originalPath
+        }
+      )
+    )
 
     return {
       cid,
       path: file.path,
       unixfs: f,
-      size: BigInt(block.length + node.Links.reduce((acc, curr) => acc + (curr.Tsize ?? 0), 0)),
+      size: BigInt(
+        block.length +
+          node.Links.reduce((acc, curr) => acc + (curr.Tsize ?? 0), 0)
+      ),
       originalPath: file.originalPath,
       block
     }
@@ -188,10 +232,19 @@ const reduce = (file: File, blockstore: WritableStorage, options: ReduceOptions)
   return reducer
 }
 
-export interface FileBuilderOptions extends BuildFileBatchOptions, ReduceOptions {
+export interface FileBuilderOptions
+  extends BuildFileBatchOptions,
+  ReduceOptions {
   layout: FileLayout
 }
 
-export const fileBuilder = async (file: File, block: WritableStorage, options: FileBuilderOptions): Promise<InProgressImportResult> => {
-  return options.layout(buildFileBatch(file, block, options), reduce(file, block, options))
-}
+export const defaultFileBuilder = async (
+  file: File,
+  block: WritableStorage,
+  options: FileBuilderOptions
+): Promise<InProgressImportResult> => {
+  return options.layout(
+    buildFileBatch(file, block, options),
+    reduce(file, block, options)
+  );
+};
diff --git a/packages/ipfs-unixfs-importer/src/dag-builder/index.ts b/packages/ipfs-unixfs-importer/src/dag-builder/index.ts
index 1559b86a..94f722e2 100644
--- a/packages/ipfs-unixfs-importer/src/dag-builder/index.ts
+++ b/packages/ipfs-unixfs-importer/src/dag-builder/index.ts
@@ -1,10 +1,18 @@
 import errCode from 'err-code'
 import { CustomProgressEvent } from 'progress-events'
-import { dirBuilder, type DirBuilderOptions } from './dir.js'
-import { fileBuilder, type FileBuilderOptions } from './file.js'
+import { defaultDirBuilder, type DirBuilderOptions } from './dir.js'
+import { defaultFileBuilder, type FileBuilderOptions } from './file.js'
 import type { ChunkValidator } from './validate-chunks.js'
 import type { Chunker } from '../chunker/index.js'
-import type { Directory, File, FileCandidate, ImportCandidate, ImporterProgressEvents, InProgressImportResult, WritableStorage } from '../index.js'
+import type {
+  Directory,
+  File,
+  FileCandidate,
+  ImportCandidate,
+  ImporterProgressEvents,
+  InProgressImportResult,
+  WritableStorage
+} from '../index.js'
 import type { ProgressEvent, ProgressOptions } from 'progress-events'
 
 /**
@@ -27,8 +35,10 @@ export interface ImportReadProgress {
   path?: string
 }
 
-export type DagBuilderProgressEvents =
-  ProgressEvent<'unixfs:importer:progress:file:read', ImportReadProgress>
+export type DagBuilderProgressEvents = ProgressEvent<
+'unixfs:importer:progress:file:read',
+ImportReadProgress
+>
 
 function isIterable (thing: any): thing is Iterable<any> {
   return Symbol.iterator in thing
@@ -38,16 +48,18 @@ function isAsyncIterable (thing: any): thing is AsyncIterable<any> {
   return Symbol.asyncIterator in thing
 }
 
-function contentAsAsyncIterable (content: Uint8Array | AsyncIterable<Uint8Array> | Iterable<Uint8Array>): AsyncIterable<Uint8Array> {
+function contentAsAsyncIterable (
+  content: Uint8Array | AsyncIterable<Uint8Array> | Iterable<Uint8Array>
+): AsyncIterable<Uint8Array> {
   try {
     if (content instanceof Uint8Array) {
       return (async function * () {
         yield content
-      }())
+      })()
     } else if (isIterable(content)) {
       return (async function * () {
         yield * content
-      }())
+      })()
     } else if (isAsyncIterable(content)) {
       return content
     }
@@ -58,16 +70,33 @@ function contentAsAsyncIterable (content: Uint8Array | AsyncIterable<Uint8Array>
   throw errCode(new Error('Content was invalid'), 'ERR_INVALID_CONTENT')
 }
 
-export interface DagBuilderOptions extends FileBuilderOptions, DirBuilderOptions, ProgressOptions<ImporterProgressEvents> {
+export interface DagBuilderOptions
+  extends FileBuilderOptions,
+  DirBuilderOptions,
+  ProgressOptions<ImporterProgressEvents> {
   chunker: Chunker
   chunkValidator: ChunkValidator
   wrapWithDirectory: boolean
+  dirBuilder?(
+    dir: Directory,
+    blockstore: WritableStorage,
+    options: DirBuilderOptions
+  ): Promise<InProgressImportResult>
+  fileBuilder?(
+    file: File,
+    blockstore: WritableStorage,
+    options: FileBuilderOptions
+  ): Promise<InProgressImportResult>
 }
 
-export type ImporterSourceStream = AsyncIterable<ImportCandidate> | Iterable<ImportCandidate>
+export type ImporterSourceStream =
+  | AsyncIterable<ImportCandidate>
+  | Iterable<ImportCandidate>
 
 export interface DAGBuilder {
-  (source: ImporterSourceStream, blockstore: WritableStorage): AsyncIterable<() => Promise<InProgressImportResult>>
+  (source: ImporterSourceStream, blockstore: WritableStorage): AsyncIterable<
+  () => Promise<InProgressImportResult>
+  >
 }
 
 export function defaultDagBuilder (options: DagBuilderOptions): DAGBuilder {
@@ -79,7 +108,7 @@ export function defaultDagBuilder (options: DagBuilderOptions): DAGBuilder {
         originalPath = entry.path
         entry.path = entry.path
           .split('/')
-          .filter(path => path != null && path !== '.')
+          .filter((path) => path != null && path !== '.')
           .join('/')
       }
 
@@ -91,15 +120,22 @@ export function defaultDagBuilder (options: DagBuilderOptions): DAGBuilder {
           content: (async function * () {
             let bytesRead = 0n
 
-            for await (const chunk of options.chunker(options.chunkValidator(contentAsAsyncIterable(entry.content)))) {
+            for await (const chunk of options.chunker(
+              options.chunkValidator(contentAsAsyncIterable(entry.content))
+            )) {
               const currentChunkSize = BigInt(chunk.byteLength)
               bytesRead += currentChunkSize
 
-              options.onProgress?.(new CustomProgressEvent<ImportReadProgress>('unixfs:importer:progress:file:read', {
-                bytesRead,
-                chunkSize: currentChunkSize,
-                path: entry.path
-              }))
+              options.onProgress?.(
+                new CustomProgressEvent<ImportReadProgress>(
+                  'unixfs:importer:progress:file:read',
+                  {
+                    bytesRead,
+                    chunkSize: currentChunkSize,
+                    path: entry.path
+                  }
+                )
+              )
 
               yield chunk
             }
@@ -107,6 +143,8 @@ export function defaultDagBuilder (options: DagBuilderOptions): DAGBuilder {
           originalPath
         }
 
+        const fileBuilder = options.fileBuilder ?? defaultFileBuilder
+
         yield async () => fileBuilder(file, blockstore, options)
       } else if (entry.path != null) {
         const dir: Directory = {
@@ -116,6 +154,10 @@ export function defaultDagBuilder (options: DagBuilderOptions): DAGBuilder {
           originalPath
         }
 
+        const dirBuilder =
+          options.dirBuilder ??
+          defaultDirBuilder
+
         yield async () => dirBuilder(dir, blockstore, options)
       } else {
         throw new Error('Import candidate must have content or path or both')
diff --git a/packages/ipfs-unixfs-importer/src/index.ts b/packages/ipfs-unixfs-importer/src/index.ts
index aa4c3243..39dcd5bb 100644
--- a/packages/ipfs-unixfs-importer/src/index.ts
+++ b/packages/ipfs-unixfs-importer/src/index.ts
@@ -319,6 +319,7 @@ export async function * importer (source: ImportCandidateStream, blockstore: Wri
   const fileImportConcurrency = options.fileImportConcurrency ?? 50
   const blockWriteConcurrency = options.blockWriteConcurrency ?? 10
   const reduceSingleLeafToSelf = options.reduceSingleLeafToSelf ?? true
+  
 
   const chunker = options.chunker ?? fixedSize()
   const chunkValidator = options.chunkValidator ?? defaultChunkValidator()
diff --git a/packages/ipfs-unixfs-importer/tsconfig.json b/packages/ipfs-unixfs-importer/tsconfig.json
index 3ec310c6..17bb38cf 100644
--- a/packages/ipfs-unixfs-importer/tsconfig.json
+++ b/packages/ipfs-unixfs-importer/tsconfig.json
@@ -1,7 +1,8 @@
 {
   "extends": "aegir/src/config/tsconfig.aegir.json",
   "compilerOptions": {
-    "outDir": "dist"
+    "outDir": "dist",
+    "esModuleInterop": true
   },
   "include": [
     "src",