diff --git a/store/cafs/src/index.ts b/store/cafs/src/index.ts
index 1d737119dc..3ddf54b552 100644
--- a/store/cafs/src/index.ts
+++ b/store/cafs/src/index.ts
@@ -1,4 +1,4 @@
-import { type FileWriteResult, type PackageFileInfo, type FilesIndex } from '@pnpm/cafs-types'
+import { type AddToStoreResult, type FileWriteResult, type PackageFileInfo, type FilesIndex } from '@pnpm/cafs-types'
 import ssri from 'ssri'
 import { addFilesFromDir } from './addFilesFromDir'
 import { addFilesFromTarball } from './addFilesFromTarball'
@@ -41,7 +41,14 @@ export interface CreateCafsOpts {
   cafsLocker?: CafsLocker
 }
 
-export function createCafs (cafsDir: string, { ignoreFile, cafsLocker }: CreateCafsOpts = {}) {
+export interface CafsFunctions {
+  addFilesFromDir: (dirname: string, opts?: { files?: string[], readManifest?: boolean }) => AddToStoreResult
+  addFilesFromTarball: (tarballBuffer: Buffer, readManifest?: boolean) => AddToStoreResult
+  getFilePathInCafs: (integrity: string | ssri.IntegrityLike, fileType: FileType) => string
+  getFilePathByModeInCafs: (integrity: string | ssri.IntegrityLike, mode: number) => string
+}
+
+export function createCafs (cafsDir: string, { ignoreFile, cafsLocker }: CreateCafsOpts = {}): CafsFunctions {
   const _writeBufferToCafs = writeBufferToCafs.bind(null, cafsLocker ?? new Map(), cafsDir)
   const addBuffer = addBufferToCafs.bind(null, _writeBufferToCafs)
   return {
diff --git a/worker/src/worker.ts b/worker/src/worker.ts
index 91eb76cecd..298c7adac8 100644
--- a/worker/src/worker.ts
+++ b/worker/src/worker.ts
@@ -2,10 +2,12 @@ import path from 'path'
 import fs from 'fs'
 import gfs from '@pnpm/graceful-fs'
 import * as crypto from 'crypto'
+import { type Cafs } from '@pnpm/cafs-types'
 import { createCafsStore } from '@pnpm/create-cafs-store'
 import { pkgRequiresBuild } from '@pnpm/exec.pkg-requires-build'
 import { hardLinkDir } from '@pnpm/fs.hard-link-dir'
 import {
+  type CafsFunctions,
   checkPkgFilesIntegrity,
   createCafs,
   type PackageFileInfo,
@@ -33,8 +35,8 @@ const INTEGRITY_REGEX: RegExp = /^([^-]+)-([A-Za-z0-9+/=]+)$/
 
 parentPort!.on('message', handleMessage)
 
-const cafsCache = new Map<string, ReturnType<typeof createCafs>>()
-const cafsStoreCache = new Map<string, ReturnType<typeof createCafsStore>>()
+const cafsCache = new Map<string, CafsFunctions>()
+const cafsStoreCache = new Map<string, Cafs>()
 const cafsLocker = new Map<string, number>()
 
 async function handleMessage (