diff --git a/.editorconfig b/.editorconfig
new file mode 100644
index 0000000..ce26749
--- /dev/null
+++ b/.editorconfig
@@ -0,0 +1,11 @@
+# http://editorconfig.org/
+root = true
+
+[*]
+indent_style = space
+indent_size = 2
+tab_width = 2
+end_of_line = lf
+charset = utf-8
+trim_trailing_whitespace = true
+insert_final_newline = true
diff --git a/.gitignore b/.gitignore
index 9d6714b..f804523 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,4 +1,6 @@
 .DS_Store
+.nyc_output
+.cache
 .idea
 
 # Logs
@@ -29,4 +31,4 @@ build/Release
 node_modules
 
 # Cache files generated by tests
-build/cache
+fixture-cache
diff --git a/README.md b/README.md
index 272ab56..a4d05d3 100755
--- a/README.md
+++ b/README.md
@@ -1,6 +1,6 @@
 # memoize-fs
 
-memoize/cache in file system solution for Node.js
+Node.js solution for memoizing/caching a function and its return state into the file system
 
 [![Build Status](https://travis-ci.org/borisdiakur/memoize-fs.svg?branch=master)](https://travis-ci.org/borisdiakur/memoize-fs)
 [![Coverage Status](https://coveralls.io/repos/borisdiakur/memoize-fs/badge.svg?branch=master)](https://coveralls.io/r/borisdiakur/memoize-fs?branch=master)
@@ -32,30 +32,70 @@ npm install memoize-fs --save
 
 ## Usage
 
-```javascript
-var cachePath = require('path').join(__dirname, '..', 'cache'),
-    memoize = require('memoize-fs')({ cachePath: cachePath }),
-    fun = function (a, b) { return a + b; };
+```js
+const assert = require('assert')
+const memoizeFs = require('memoize-fs')
 
-memoize.fn(fun).then(function (memFn) {
-    memFn(1, 2).then(function (result) {
-        assert.strictEqual(result, 3);
-        return memFn(1, 2); // cache hit
-    }).then(function (result) {
-        assert.strictEqual(result, 3);
-    }).catch( /* handle error */ );
-}).catch( /* handle error */ );
+const memoizer = memoizeFs({ cachePath: './some-cache' })
+
+console.log(memoizer)
+// => {
+//   fn: [Function: fn],
+//   getCacheFilePath: [Function: getCacheFilePathBound],
+//   invalidate: [Function: invalidateCache]
+// }
+
+async function main () {
+  let idx = 0
+  const func = function foo (a, b) {
+    idx += a + b
+    return idx
+  }
+
+  const memoizedFn = await memoizer.fn(func)
+  const resultOne = await memoizedFn(1, 2)
+
+  assert.strictEqual(resultOne, 3)
+  assert.strictEqual(idx, 3)
+
+  const resultTwo = await memoizedFn(1, 2) // cache hit
+  assert.strictEqual(resultTwo, 3)
+  assert.strictEqual(idx, 3)
+}
+
+main().catch(console.error)
 ```
 
-__Note that a result of a memoized function is always a [Promise](http://www.html5rocks.com/en/tutorials/es6/promises/) instance!__
+_**NOTE:** that memoized function is always an async function and
+the result of it is a Promise (if not `await`-ed as seen in above example)!_
+
+- [Learn more about Promises](https://javascript.info/promise-basics)
+- [Learn more about async/await](https://javascript.info/async-await)
 
-### Memoizing asynchronous functions
+### Signature
+
+See [Types](#types) and [Options](#options) sections for more info.
+
+```js
+const memoizer = memoizeFs(MemoizeOptions)
+
+console.log(memoizer)
+// => {
+//   fn: [Function: fn],
+//   getCacheFilePath: [Function: getCacheFilePathBound],
+//   invalidate: [Function: invalidateCache]
+// }
+
+const memoizedFn = memoizer.fn(FunctionToMemoize, Options?)
+```
+
+## Memoizing asynchronous functions
 
 memoize-fs assumes a function asynchronous if the last argument it accepts is of type `function` and that function itself accepts at least one argument.
 So basically you don't have to do anything differently than when memoizing synchronous functions. Just make sure the above condition is fulfilled.
 Here is an example of memoizing a function with a callback:
 
-```javascript
+```js
 var funAsync = function (a, b, cb) {
     setTimeout(function () {
         cb(null, a + b);
@@ -71,7 +111,7 @@ memoize.fn(funAsync).then(function (memFn) {
 }).catch( /* handle error */ );
 ```
 
-### Memoizing promisified functions
+## Memoizing promisified functions
 
 You can also memoize a promisified function. memoize-fs assumes a function promisified if its result is _thenable_
 which means that the result is an object with a property `then` of type `function`
@@ -79,7 +119,7 @@ which means that the result is an object with a property `then` of type `functio
 So again it's the same as with memoizing synchronous functions.
 Here is an example of memoizing a promisified function:
 
-```javascript
+```js
 var funPromisified = function (a, b) {
     return new Promise(function (resolve, reject) {
         setTimeout(function () { resolve(a + b); }, 100);
@@ -96,84 +136,151 @@ memoize.fn(funPromisified).then(function (memFn) {
 }).catch( /* handle error */ );
 ```
 
-### Options
+## Types
+
+```ts
+export interface Options {
+  cacheId?: string;
+  salt?: string;
+  maxAge?: number;
+  force?: boolean;
+  astBody?: boolean;
+  noBody?: boolean;
+  serialize?: (val?: any) => string;
+  deserialize?: (val?: string) => any;
+}
+
+export type MemoizeOptions = Options & { cachePath: string };
+export type FnToMemoize = (...args: any[]) => any;
+
+export interface Memoizer {
+  fn: (fnToMemoize: FunctionToMemoize, options?: Options) => Promise<FunctionToMemoize>;
+  invalidate: (id?: string) => Promise<any>;
+  getCacheFilePath: (fnToMemoize: FunctionToMemoize, options: Options) => string;
+}
+
+declare function memoizeFs(options: MemoizeOptions): Memoizer;
+
+export = memoizeFs;
+```
+
+## Options
 
 When memoizing a function all below options can be applied in any combination.
+The only required option is `cachePath`.
+
+
+### cachePath
 
-#### cacheId
+Path to the location of the cache on the disk. This option is always **required**.
+
+### cacheId
 
 By default all cache files are saved into the __root cache__ which is the folder specified by the cachePath option:
 
-```javascript
-var memoize = require('memoize-fs')({ cachePath: require('path').join(__dirname, '../../cache' });
+```js
+var path = require('path')
+var memoizer = require('memoize-fs')({ cachePath: path.join(__dirname, '../../cache') })
 ```
 
 The `cacheId` option which you can specify during memoization of a function resolves to the name of a subfolder created inside the root cache folder.
 Cached function calls will be cached inside that folder:
 
-```javascript
-memoize.fn(fun, { cacheId: 'foobar' }).then(...
+```js
+memoizer.fn(fnToMemoize, { cacheId: 'foobar' })
 ```
 
-#### salt
+### salt
 
 Functions may have references to variables outside their own scope. As a consequence two functions which look exactly the same
 (they have the same function signature and function body) can return different results even when executed with identical arguments.
 In order to avoid the same cache being used for two different functions you can use the `salt` option
 which mutates the hash key created for the memoized function which in turn defines the name of the cache file:
 
-```javascript
-memoize.fn(fun, { salt: 'foobar' }).then(...
+```js
+memoizer.fn(fnToMemoize, { salt: 'foobar' })
 ```
 
-#### maxAge
+### maxAge
 
 With `maxAge` option you can ensure that cache for given call is cleared after a predefined period of time (in milliseconds).
 
-```javascript
-memoize.fn(fun, { maxAge: 10000 }).then(...
+```js
+memoizer.fn(fnToMemoize, { maxAge: 10000 })
 ```
 
-#### force
+### force
 
 The `force` option forces the re-execution of an already memoized function and the re-caching of its outcome:
 
-```javascript
-memoize.fn(fun, { force: true }).then(...
+```js
+memoizer.fn(fnToMemoize, { force: true })
 ```
 
-#### astBody
+### astBody
 
 If you want to use the function AST instead the function body when generating the hash ([see serialization](#serialization)), set the option `astBody` to `true`. This allows the function source code to be reformatted without busting the cache. See https://github.com/borisdiakur/memoize-fs/issues/6 for details.
 
-```javascript
-memoize.fn(fun, { astBody: true }).then(...
+```js
+memoizer.fn(fnToMemoize, { astBody: true })
 ```
 
-#### noBody
+### noBody
 
 If for some reason you want to omit the function body when generating the hash ([see serialization](#serialization)), set the option `noBody` to `true`.
 
-```javascript
-memoize.fn(fun, { noBody: true }).then(...
+```js
+memoizer.fn(fnToMemoize, { noBody: true })
 ```
 
-### Manual cache invalidation
+### serialize and deserialize
+
+These two options allows you to control how the serialization and deserialization process works.
+By default we use basic `JSON.stringify` and `JSON.parse`, but you may need more advanced stuff.
+
+In the following example we are using [Yahoo's `serialize-javascript`](https://ghub.now.sh/serialize-javascript)
+to be able to cache properly the return result of memoized function containing a `function`.
+
+```js
+const memoizeFs = require('memoize-fs')
+const serialize = require('serialize-javascript')
+
+const deserialize = (serializedJsString) => eval(`(${serializedJsString})`)
+
+const memoizer = memoizeFs({ cachePath: './cache', serialize, deserialize })
+
+function someFn (a) {
+  const bar = 123
+
+  setTimeout(() => {}, a * 10)
+
+  return {
+    bar,
+    getBar() { return a + bar }
+  }
+}
+
+memoizer.fn(someFn)
+```
+
+## Manual cache invalidation
 
 You can delete the root cache (all cache files inside the folder specified by the cachePath option):
 
-```javascript
-memoize.invalidate().then(...
+```js
+memoizer.invalidate().then(() => { console.log('cache cleared') })
 ```
 
 You can also pass the cacheId argument to the invalidate method. This way you only delete the cache inside the subfolder with given id.
 
-```javascript
-memoize.invalidate('foobar').then(...
+```js
+memoizer.invalidate('foobar').then(() => { console.log('cache for "foobar" cleared') })
 ```
 
 ## Serialization
 
+See also the [`options.seriliaze` and `options.deserialize`](#serialize-and-deserialize).
+
 memoize-fs uses JSON to serialize the results of a memoized function.
 It also uses JSON, when it tries to serialize the arguments of the memoized function in order to create a hash
 which is used as the name of the cache file to be stored or retrieved.
@@ -182,9 +289,9 @@ The hash is created from the serialized arguments, the function body and the [sa
 You can generate this hash using `memoize.getCacheFilePath`:
 
 ```js
-var memoize = require('memoize-fs')({cachePath: '/'})
-memoize.getCacheFilePath(function () {}, ['arg', 'arg'], {cacheId: 'foobar'})
-// -> '/foobar/06f254...'
+var memoizer = require('memoize-fs')({ cachePath: './' })
+memoizer.getCacheFilePath(function () {}, ['arg', 'arg'], { cacheId: 'foobar' })
+// -> './foobar/06f254...'
 ```
 
 Since memoize-fs is using JSON for serialization, __you should know__ how it works around some of its "limitations":
@@ -222,11 +329,13 @@ Issues and Pull-requests are absolutely welcome. If you want to submit a patch,
 many people contributed. — [idiomatic.js](https://github.com/rwldrn/idiomatic.js/)
 
 Lint with:
+
 ```shell
-npm run jshint
+npm run lint
 ```
 
 Test with:
+
 ```shell
 npm run mocha
 ```
@@ -234,7 +343,7 @@ npm run mocha
 Check code coverage with:
 
 ```shell
-npm run istanbul
+npm run coverage
 ```
 
-Then please commit with a __detailed__ commit message.
+Then please commit with a **detailed** commit message.
diff --git a/example.js b/example.js
new file mode 100644
index 0000000..af1a385
--- /dev/null
+++ b/example.js
@@ -0,0 +1,31 @@
+const assert = require('assert')
+const memoizeFs = require('./index')
+
+const memoizer = memoizeFs({ cachePath: './some-cache' })
+
+console.log(memoizer)
+// => {
+//   fn: [Function: fn],
+//   getCacheFilePath: [Function: getCacheFilePathBound],
+//   invalidate: [Function: invalidateCache]
+// }
+
+async function main () {
+  let idx = 0
+  const func = function foo (a, b) {
+    idx += a + b
+    return idx
+  }
+
+  const memoizedFn = await memoizer.fn(func)
+  const resultOne = await memoizedFn(1, 2)
+
+  assert.strictEqual(resultOne, 3)
+  assert.strictEqual(idx, 3)
+
+  const resultTwo = await memoizedFn(1, 2) // cache hit
+  assert.strictEqual(resultTwo, 3)
+  assert.strictEqual(idx, 3)
+}
+
+main().catch(console.error)
diff --git a/index.d.ts b/index.d.ts
new file mode 100644
index 0000000..bfd926b
--- /dev/null
+++ b/index.d.ts
@@ -0,0 +1,23 @@
+export interface Options {
+  cacheId?: string;
+  salt?: string;
+  maxAge?: number;
+  force?: boolean;
+  astBody?: boolean;
+  noBody?: boolean;
+  serialize?: (val?: any) => string;
+  deserialize?: (val?: string) => any;
+}
+
+export type MemoizeOptions = Options & { cachePath: string };
+export type FnToMemoize = (...args: any[]) => any;
+
+export interface Memoizer {
+  fn: (fnToMemoize: FunctionToMemoize, options?: Options) => Promise<FunctionToMemoize>;
+  invalidate: (id?: string) => Promise<any>;
+  getCacheFilePath: (fnToMemoize: FunctionToMemoize, options: Options) => string;
+}
+
+declare function memoizeFs(options: MemoizeOptions): Memoizer;
+
+export = memoizeFs;
diff --git a/index.js b/index.js
index a33494e..d78812f 100644
--- a/index.js
+++ b/index.js
@@ -1,13 +1,18 @@
-const mkdirp = require('mkdirp')
-const fs = require('fs')
+'use strict'
+
 const path = require('path')
-const rmdir = require('rimraf')
 const crypto = require('crypto')
 const meriyah = require('meriyah')
+const fs = require('fs-extra')
 
 module.exports = buildMemoizer
 module.exports.getCacheFilePath = getCacheFilePath
 
+const serializer = {
+  serialize,
+  deserialize
+}
+
 function serialize (val) {
   const circRefColl = []
   return JSON.stringify(val, function (name, value) {
@@ -26,66 +31,87 @@ function serialize (val) {
   })
 }
 
+function deserialize (str) {
+  return JSON.parse(str).data
+}
+
 function getCacheFilePath (fn, args, opt) {
-  const salt = opt.salt || ''
+  const options = { ...serializer, ...opt }
+  const salt = options.salt || ''
   let fnStr = ''
-  if (!opt.noBody) {
+  if (!options.noBody) {
     fnStr = String(fn)
-    if (opt.astBody) {
+    if (options.astBody) {
       fnStr = meriyah.parse(fnStr, { jsx: true, next: true })
     }
-    fnStr = opt.astBody ? JSON.stringify(fnStr) : fnStr
+    fnStr = options.astBody ? JSON.stringify(fnStr) : fnStr
   }
-  const argsStr = serialize(args)
+
+  const argsStr = options.serialize(args)
   const hash = crypto.createHash('md5').update(fnStr + argsStr + salt).digest('hex')
-  return path.join(opt.cachePath, opt.cacheId, hash)
+
+  return path.join(options.cachePath, options.cacheId, hash)
 }
 
 function buildMemoizer (options) {
   const promiseCache = {}
 
   // check args
-  if (typeof options !== 'object') {
+  if (!options || (options && typeof options !== 'object')) {
     throw new Error('options of type object expected')
   }
   if (typeof options.cachePath !== 'string') {
     throw new Error('option cachePath of type string expected')
   }
+  options = { ...serializer, ...options }
+  checkOptions(options)
+
+  function checkOptions (opts) {
+    if (opts.salt && typeof opts.salt !== 'string') {
+      throw new TypeError('salt option of type string expected, got: ' + typeof opts.salt)
+    }
+    if (opts.cacheId && typeof opts.cacheId !== 'string') {
+      throw new TypeError('cacheId option of type string expected, got: ' + typeof opts.cacheId)
+    }
+    if (opts.maxAge && typeof opts.maxAge !== 'number') {
+      throw new TypeError('maxAge option of type number bigger zero expected')
+    }
+    if (opts.serialize && typeof opts.serialize !== 'function') {
+      throw new TypeError('serialize option of type function expected')
+    }
+    if (opts.deserialize && typeof opts.deserialize !== 'function') {
+      throw new TypeError('deserialize option of type function expected')
+    }
+  }
 
   // check for existing cache folder, if not found, create folder, then resolve
-  function initCache (cachePath) {
+  function initCache (cachePath, opts) {
     return new Promise(function (resolve, reject) {
-      return mkdirp(cachePath).then(() => {
-        resolve()
-      }).catch(reject)
+      return fs.ensureDir(cachePath, { recursive: true })
+        .then(() => {
+          resolve()
+        })
+        .catch((err) => {
+          if (err && err.code === 'EEXIST' && opts.throwError === false) {
+            resolve()
+            return
+          }
+          reject(err)
+        })
     })
   }
 
   function memoizeFn (fn, opt) {
-    function checkOptions (optExt) {
-      if (optExt.salt && typeof optExt.salt !== 'string') {
-        throw new Error('salt option of type string expected, got \'' + typeof optExt.salt + '\'')
-      }
-      if (optExt.cacheId && typeof optExt.cacheId !== 'string') {
-        throw new Error('cacheId option of type string expected, got \'' + typeof optExt.cacheId + '\'')
-      }
-      if (optExt.maxAge && typeof optExt.maxAge !== 'number') {
-        throw new Error('maxAge option of type number bigger zero expected')
-      }
-    }
-
     if (opt && typeof opt !== 'object') {
       throw new Error('opt of type object expected, got \'' + typeof opt + '\'')
     }
 
-    const optExt = opt || {}
-
     if (typeof fn !== 'function') {
       throw new Error('fn of type function expected')
     }
-    checkOptions(optExt)
 
-    optExt.cacheId = optExt.cacheId || './'
+    const optExt = { cacheId: './', ...options, ...opt }
+    checkOptions(optExt)
 
     function resolveWithMemFn () {
       return new Promise(function (resolve) {
@@ -112,7 +138,7 @@ function buildMemoizer (options) {
                 let resultString
                 if ((r && typeof r === 'object') || typeof r === 'string') {
                   resultObj = { data: r }
-                  resultString = serialize(resultObj)
+                  resultString = optExt.serialize(resultObj)
                 } else {
                   resultString = '{"data":' + r + '}'
                 }
@@ -153,7 +179,7 @@ function buildMemoizer (options) {
                 } catch (e) {
                   return reject(e)
                 }
-                if (result && result.then && typeof result.then === 'function') {
+                if (result && typeof result.then === 'function') {
                   // result is a promise instance
                   return result.then(function (retObj) {
                     writeResult(retObj, function () {
@@ -188,7 +214,9 @@ function buildMemoizer (options) {
 
               function parseResult (resultString) {
                 try {
-                  return JSON.parse(resultString).data // will fail on NaN
+                  const deserializedValue = optExt.deserialize(resultString)
+
+                  return deserializedValue
                 } catch (e) {
                   return undefined
                 }
@@ -228,7 +256,7 @@ function buildMemoizer (options) {
       })
     }
 
-    return initCache(path.join(options.cachePath, optExt.cacheId)).then(resolveWithMemFn)
+    return initCache(path.join(options.cachePath, optExt.cacheId), optExt).then(resolveWithMemFn)
   }
 
   function invalidateCache (cacheId) {
@@ -237,19 +265,15 @@ function buildMemoizer (options) {
         reject(Error('cacheId option of type string expected, got \'' + typeof cacheId + '\''))
       } else {
         const cachPath = cacheId ? path.join(options.cachePath, cacheId) : options.cachePath
-        rmdir(cachPath, function (err) {
-          if (err) {
-            reject(err)
-          } else {
-            resolve()
-          }
-        })
+        fs.remove(cachPath)
+          .then(resolve)
+          .catch(reject)
       }
     })
   }
 
   function getCacheFilePathBound (fn, args, opt) {
-    return getCacheFilePath(fn, args, Object.assign({}, opt, { cachePath: options.cachePath }))
+    return getCacheFilePath(fn, args, { ...options, ...opt, cachePath: options.cachePath })
   }
 
   const cache = initCache(options.cachePath)
diff --git a/package-lock.json b/package-lock.json
index 5faaac6..cbab5f1 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -13,6 +13,103 @@
         "@babel/highlight": "^7.8.3"
       }
     },
+    "@babel/core": {
+      "version": "7.8.6",
+      "resolved": "https://registry.npmjs.org/@babel/core/-/core-7.8.6.tgz",
+      "integrity": "sha512-Sheg7yEJD51YHAvLEV/7Uvw95AeWqYPL3Vk3zGujJKIhJ+8oLw2ALaf3hbucILhKsgSoADOvtKRJuNVdcJkOrg==",
+      "dev": true,
+      "requires": {
+        "@babel/code-frame": "^7.8.3",
+        "@babel/generator": "^7.8.6",
+        "@babel/helpers": "^7.8.4",
+        "@babel/parser": "^7.8.6",
+        "@babel/template": "^7.8.6",
+        "@babel/traverse": "^7.8.6",
+        "@babel/types": "^7.8.6",
+        "convert-source-map": "^1.7.0",
+        "debug": "^4.1.0",
+        "gensync": "^1.0.0-beta.1",
+        "json5": "^2.1.0",
+        "lodash": "^4.17.13",
+        "resolve": "^1.3.2",
+        "semver": "^5.4.1",
+        "source-map": "^0.5.0"
+      },
+      "dependencies": {
+        "semver": {
+          "version": "5.7.1",
+          "resolved": "https://registry.npmjs.org/semver/-/semver-5.7.1.tgz",
+          "integrity": "sha512-sauaDf/PZdVgrLTNYHRtpXa1iRiKcaebiKQ1BJdpQlWH2lCvexQdX55snPFyK7QzpudqbCI0qXFfOasHdyNDGQ==",
+          "dev": true
+        },
+        "source-map": {
+          "version": "0.5.7",
+          "resolved": "https://registry.npmjs.org/source-map/-/source-map-0.5.7.tgz",
+          "integrity": "sha1-igOdLRAh0i0eoUyA2OpGi6LvP8w=",
+          "dev": true
+        }
+      }
+    },
+    "@babel/generator": {
+      "version": "7.8.6",
+      "resolved": "https://registry.npmjs.org/@babel/generator/-/generator-7.8.6.tgz",
+      "integrity": "sha512-4bpOR5ZBz+wWcMeVtcf7FbjcFzCp+817z2/gHNncIRcM9MmKzUhtWCYAq27RAfUrAFwb+OCG1s9WEaVxfi6cjg==",
+      "dev": true,
+      "requires": {
+        "@babel/types": "^7.8.6",
+        "jsesc": "^2.5.1",
+        "lodash": "^4.17.13",
+        "source-map": "^0.5.0"
+      },
+      "dependencies": {
+        "source-map": {
+          "version": "0.5.7",
+          "resolved": "https://registry.npmjs.org/source-map/-/source-map-0.5.7.tgz",
+          "integrity": "sha1-igOdLRAh0i0eoUyA2OpGi6LvP8w=",
+          "dev": true
+        }
+      }
+    },
+    "@babel/helper-function-name": {
+      "version": "7.8.3",
+      "resolved": "https://registry.npmjs.org/@babel/helper-function-name/-/helper-function-name-7.8.3.tgz",
+      "integrity": "sha512-BCxgX1BC2hD/oBlIFUgOCQDOPV8nSINxCwM3o93xP4P9Fq6aV5sgv2cOOITDMtCfQ+3PvHp3l689XZvAM9QyOA==",
+      "dev": true,
+      "requires": {
+        "@babel/helper-get-function-arity": "^7.8.3",
+        "@babel/template": "^7.8.3",
+        "@babel/types": "^7.8.3"
+      }
+    },
+    "@babel/helper-get-function-arity": {
+      "version": "7.8.3",
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       "requires": {
-        "psl": "^1.1.24",
-        "punycode": "^1.4.1"
-      },
-      "dependencies": {
-        "punycode": {
-          "version": "1.4.1",
-          "resolved": "https://registry.npmjs.org/punycode/-/punycode-1.4.1.tgz",
-          "integrity": "sha1-wNWmOycYgArY4esPpSachN1BhF4=",
-          "dev": true
-        }
+        "psl": "^1.1.28",
+        "punycode": "^2.1.1"
       }
     },
+    "trim-newlines": {
+      "version": "2.0.0",
+      "resolved": "https://registry.npmjs.org/trim-newlines/-/trim-newlines-2.0.0.tgz",
+      "integrity": "sha1-tAPQuRvlDDMd/EuC7s6yLD3hbSA=",
+      "dev": true
+    },
     "tslib": {
-      "version": "1.10.0",
-      "resolved": "https://registry.npmjs.org/tslib/-/tslib-1.10.0.tgz",
-      "integrity": "sha512-qOebF53frne81cf0S9B41ByenJ3/IuH8yJKngAX35CmiZySA0khhkovshKK+jGCaMnVomla7gVlIcc3EvKPbTQ==",
+      "version": "1.11.1",
+      "resolved": "https://registry.npmjs.org/tslib/-/tslib-1.11.1.tgz",
+      "integrity": "sha512-aZW88SY8kQbU7gpV19lN24LtXh/yD4ZZg6qieAJDDg+YBsJcSmLGK9QpnUjAKVG/xefmvJGd1WUmfpT/g6AJGA==",
       "dev": true
     },
     "tunnel-agent": {
@@ -2523,6 +3534,20 @@
       "integrity": "sha512-4dbzIzqvjtgiM5rw1k5rEHtBANKmdudhGyBEajN01fEyhaAIhsoKNy6y7+IN93IfpFtwY9iqi7kD+xwKhQsNJA==",
       "dev": true
     },
+    "typedarray-to-buffer": {
+      "version": "3.1.5",
+      "resolved": "https://registry.npmjs.org/typedarray-to-buffer/-/typedarray-to-buffer-3.1.5.tgz",
+      "integrity": "sha512-zdu8XMNEDepKKR+XYOXAVPtWui0ly0NtohUscw+UmaHiAWT8hrV1rr//H6V+0DvJ3OQ19S979M0laLfX8rm82Q==",
+      "dev": true,
+      "requires": {
+        "is-typedarray": "^1.0.0"
+      }
+    },
+    "universalify": {
+      "version": "0.1.2",
+      "resolved": "https://registry.npmjs.org/universalify/-/universalify-0.1.2.tgz",
+      "integrity": "sha512-rBJeI5CXAlmy1pV+617WB9J63U6XcazHHF2f2dbJix4XzpUF0RS3Zbj0FGIOCAva5P/d/GBOYaACQ1w+0azUkg=="
+    },
     "uri-js": {
       "version": "4.2.2",
       "resolved": "https://registry.npmjs.org/uri-js/-/uri-js-4.2.2.tgz",
@@ -2566,9 +3591,9 @@
       }
     },
     "which": {
-      "version": "1.3.0",
-      "resolved": "https://registry.npmjs.org/which/-/which-1.3.0.tgz",
-      "integrity": "sha512-xcJpopdamTuY5duC/KnTTNBraPK54YwpenP4lzxU8H91GudWpFv38u0CKjclE1Wi2EH2EDz5LRcHcKbCIzqGyg==",
+      "version": "1.3.1",
+      "resolved": "https://registry.npmjs.org/which/-/which-1.3.1.tgz",
+      "integrity": "sha512-HxJdYWq1MTIQbJ3nw0cqssHoTNU267KlrDuGZ1WYlxDStUtKUhOaJmh112/TZmHxxUfuJqPXSOm7tDyas0OSIQ==",
       "dev": true,
       "requires": {
         "isexe": "^2.0.0"
@@ -2628,12 +3653,6 @@
       "integrity": "sha512-Hz/mrNwitNRh/HUAtM/VT/5VH+ygD6DV7mYKZAtHOrbs8U7lvPS6xf7EJKMF0uW1KJCl0H701g3ZGus+muE5vQ==",
       "dev": true
     },
-    "wordwrap": {
-      "version": "1.0.0",
-      "resolved": "https://registry.npmjs.org/wordwrap/-/wordwrap-1.0.0.tgz",
-      "integrity": "sha1-J1hIEIkUVqQXHI0CJkQa3pDLyus=",
-      "dev": true
-    },
     "wrap-ansi": {
       "version": "5.1.0",
       "resolved": "https://registry.npmjs.org/wrap-ansi/-/wrap-ansi-5.1.0.tgz",
@@ -2673,7 +3692,8 @@
     "wrappy": {
       "version": "1.0.2",
       "resolved": "https://registry.npmjs.org/wrappy/-/wrappy-1.0.2.tgz",
-      "integrity": "sha1-tSQ9jz7BqjXxNkYFvA0QNuMKtp8="
+      "integrity": "sha1-tSQ9jz7BqjXxNkYFvA0QNuMKtp8=",
+      "dev": true
     },
     "write": {
       "version": "1.0.3",
@@ -2682,17 +3702,18 @@
       "dev": true,
       "requires": {
         "mkdirp": "^0.5.1"
-      },
-      "dependencies": {
-        "mkdirp": {
-          "version": "0.5.1",
-          "resolved": "https://registry.npmjs.org/mkdirp/-/mkdirp-0.5.1.tgz",
-          "integrity": "sha1-MAV0OOrGz3+MR2fzhkjWaX11yQM=",
-          "dev": true,
-          "requires": {
-            "minimist": "0.0.8"
-          }
-        }
+      }
+    },
+    "write-file-atomic": {
+      "version": "3.0.3",
+      "resolved": "https://registry.npmjs.org/write-file-atomic/-/write-file-atomic-3.0.3.tgz",
+      "integrity": "sha512-AvHcyZ5JnSfq3ioSyjrBkH9yW4m7Ayk8/9My/DD9onKeu/94fwrMocemO2QAJFAlnnDN+ZDS+ZjAR5ua1/PV/Q==",
+      "dev": true,
+      "requires": {
+        "imurmurhash": "^0.1.4",
+        "is-typedarray": "^1.0.0",
+        "signal-exit": "^3.0.2",
+        "typedarray-to-buffer": "^3.1.5"
       }
     },
     "y18n": {
diff --git a/package.json b/package.json
index ae30d69..60e8645 100644
--- a/package.json
+++ b/package.json
@@ -1,14 +1,15 @@
 {
   "name": "memoize-fs",
   "version": "2.0.0",
-  "description": "memoize/cache in file system solution for Node.js",
+  "description": "Node.js solution for memoizing/caching a function and its return state into the file system",
   "author": "Boris Diakur <contact@borisdiakur.com> (https://github.com/borisdiakur)",
   "scripts": {
-    "test": "npm run eslint && mocha test",
-    "eslint": "eslint .",
-    "mocha": "mocha --reporter nyan test",
-    "istanbul": "rm -rf coverage && ./node_modules/.bin/istanbul cover ./node_modules/mocha/bin/_mocha --report html && open coverage/memoize-fs/index.js.html",
-    "coveralls": "rm -rf coverage && ./node_modules/.bin/istanbul cover ./node_modules/mocha/bin/_mocha --report lcovonly -- -R spec && cat ./coverage/lcov.info | ./node_modules/coveralls/bin/coveralls.js && rm -rf ./coverage"
+    "lint": "eslint .",
+    "pretest": "npm run lint",
+    "test": "nyc mocha",
+    "mocha": "mocha -R nyan",
+    "coverage": "nyc report --reporter text-lcov | coveralls",
+    "cov": "open-cli coverage/lcov-report/index.html"
   },
   "homepage": "https://github.com/borisdiakur/memoize-fs",
   "bugs": {
@@ -19,13 +20,12 @@
     "url": "https://github.com/borisdiakur/memoize-fs"
   },
   "engines": {
-    "node": ">= 10.0.0",
+    "node": ">= 10.13.0",
     "npm": ">= 6.0.0"
   },
   "dependencies": {
-    "meriyah": "^1.9.7",
-    "mkdirp": "^1.0.3",
-    "rimraf": "^3.0.1"
+    "fs-extra": "^8.1.0",
+    "meriyah": "^1.9.7"
   },
   "devDependencies": {
     "coveralls": "^3.0.9",
@@ -35,12 +35,18 @@
     "eslint-plugin-node": "^11.0.0",
     "eslint-plugin-promise": "^4.2.1",
     "eslint-plugin-standard": "^4.0.1",
-    "istanbul": "^0.4.5",
-    "mocha": "^7.0.1",
-    "mocha-lcov-reporter": "1.3.0"
+    "mocha": "^7.1.0",
+    "nyc": "^15.0.0",
+    "open-cli": "^5.0.0",
+    "serialize-javascript": "^3.0.0"
   },
   "private": false,
   "main": "index.js",
+  "typings": "index.d.ts",
+  "files": [
+    "index.js",
+    "index.d.ts"
+  ],
   "keywords": [
     "memoize",
     "memoizer",
@@ -57,5 +63,18 @@
     "fs"
   ],
   "license": "MIT",
-  "readmeFilename": "README.md"
+  "nyc": {
+    "exclude": [
+      "test"
+    ],
+    "reporter": [
+      "text",
+      "lcov"
+    ],
+    "check-coverage": true,
+    "branches": 80,
+    "lines": 80,
+    "functions": 80,
+    "statements": 80
+  }
 }
diff --git a/test/test.js b/test/test.js
index 213a0dd..b0f04c7 100644
--- a/test/test.js
+++ b/test/test.js
@@ -2,18 +2,38 @@
 /* global describe, beforeEach, it */
 /* eslint no-useless-escape: 0, object-curly-spacing: 0 */
 
-const assert = require('assert')
-const fs = require('fs')
 const path = require('path')
-const rmdir = require('rimraf')
-const memoizeFs = require('../index.js')
+const assert = require('assert')
+const fs = require('fs-extra')
+const serialize = require('serialize-javascript')
+const memoizeFs = require('../index')
+
+const FIXTURE_CACHE = path.join(__dirname, '..', 'fixture-cache')
 
 describe('memoize-fs', function () {
   beforeEach(function (done) {
-    rmdir(path.join(__dirname, '../build/cache'), done)
+    fs.remove(FIXTURE_CACHE).then(() => done()).catch(done)
   })
 
   describe('check args', function () {
+    it('should throw an error when opts.serialize is not a function when passed', (done) => {
+      const fixture = () => {
+        memoizeFs({cachePath: FIXTURE_CACHE, serialize: 123}).fn(() => {})
+      }
+
+      assert.throws(fixture, Error)
+      assert.throws(fixture, /serialize option of type function expected/)
+      done()
+    })
+    it('should throw an error when opts.deserialize is not a function when passed', (done) => {
+      const fixture = () => {
+        memoizeFs({cachePath: FIXTURE_CACHE}).fn(() => {}, {deserialize: 123})
+      }
+
+      assert.throws(fixture, Error)
+      assert.throws(fixture, /deserialize option of type function expected/)
+      done()
+    })
     it('should throw an error when options param is not provided', function (done) {
       assert.throws(function () {
         memoizeFs()
@@ -52,7 +72,7 @@ describe('memoize-fs', function () {
 
   describe('init cache', function () {
     it('should create a cache folder before caching', function (done) {
-      const cachePath = path.join(__dirname, '../build/cache')
+      const cachePath = FIXTURE_CACHE
       const memoize = memoizeFs({cachePath: cachePath})
       memoize.fn(function () {
       }).then(function (memoized) {
@@ -65,7 +85,7 @@ describe('memoize-fs', function () {
     })
 
     it('should create a cache sub-folder before caching', function (done) {
-      const cachePath = path.join(__dirname, '../build/cache')
+      const cachePath = FIXTURE_CACHE
       const memoize = memoizeFs({cachePath: cachePath})
       memoize.fn(function () {
       }, {cacheId: 'foobar'}).then(function (memoized) {
@@ -79,6 +99,56 @@ describe('memoize-fs', function () {
       })
     })
 
+    it('should be able to pass custom serialize and deserialize through memoizeFS options', (done) => {
+      const cachePath = FIXTURE_CACHE
+      fs.removeSync(cachePath)
+
+      function deserialize (serializedJavascript) {
+        // eslint-disable-next-line no-eval
+        return eval('(' + serializedJavascript + ')')
+      }
+
+      const options = {cachePath, cacheId: 'tmp', serialize, deserialize}
+
+      const memoize = memoizeFs(options)
+
+      function toBeMemoized (abc) {
+        return { abc, foo () { return 100 + abc } }
+      }
+
+      memoize.fn(toBeMemoized)
+        .then((memFn) => {
+          return memFn(200)
+            .then((res) => {
+              assert.strictEqual(res.abc, 200)
+              assert.strictEqual(typeof res.foo, 'function')
+
+              return memFn(400)
+            })
+            .then((res) => {
+              assert.strictEqual(res.abc, 400)
+              assert.strictEqual(typeof res.foo, 'function')
+            })
+        })
+        .then(() => {
+          const fileWith200 = memoizeFs.getCacheFilePath(toBeMemoized, [200], options)
+
+          const fileString200 = fs.readFileSync(fileWith200, 'utf8')
+          assert.ok(fileString200.includes('"abc":200,"foo":function() {'))
+
+          const fileWith400 = memoizeFs.getCacheFilePath(toBeMemoized, [400], options)
+          const fileString400 = fs.readFileSync(fileWith400, 'utf8')
+          assert.ok(fileString400.includes('"abc":400,"foo":function() {'))
+
+          fs.removeSync(cachePath)
+          done()
+        })
+        .catch((err) => {
+          fs.removeSync(cachePath)
+          done(err)
+        })
+    })
+
     it('should reject with invalid cache path', function (done) {
       const cachePath = '/öäüß'
       const memoize = memoizeFs({cachePath: cachePath})
@@ -94,7 +164,7 @@ describe('memoize-fs', function () {
 
   describe('memoize fn', function () {
     it('should return a rejecting promise instance if fn param is not provided', function (done) {
-      const cachePath = path.join(__dirname, '../build/cache')
+      const cachePath = FIXTURE_CACHE
       const memoize = memoizeFs({cachePath: cachePath})
       memoize.fn().then(function () {
         done(Error('entered resolve handler instead of error handler'))
@@ -105,7 +175,7 @@ describe('memoize-fs', function () {
     })
 
     it('should return a rejecting promise instance if fn param is not of type function', function (done) {
-      const cachePath = path.join(__dirname, '../build/cache')
+      const cachePath = FIXTURE_CACHE
       const memoize = memoizeFs({cachePath: cachePath})
       memoize.fn('foobar').then(function () {
         done(Error('entered resolve handler instead of error handler'))
@@ -116,7 +186,7 @@ describe('memoize-fs', function () {
     })
 
     it('should return a rejecting promise instance if salt param is not of type string', function (done) {
-      const cachePath = path.join(__dirname, '../build/cache')
+      const cachePath = FIXTURE_CACHE
       const memoize = memoizeFs({cachePath: cachePath})
       memoize.fn(function () {
       }, {salt: true}).then(function () {
@@ -128,7 +198,7 @@ describe('memoize-fs', function () {
     })
 
     it('should return a rejecting promise instance if cacheId param is not of type string', function (done) {
-      const cachePath = path.join(__dirname, '../build/cache')
+      const cachePath = FIXTURE_CACHE
       const memoize = memoizeFs({cachePath: cachePath})
       memoize.fn(function () {
       }, {cacheId: true}).then(function () {
@@ -140,7 +210,7 @@ describe('memoize-fs', function () {
     })
 
     it('should return a rejecting promise instance if maxAge param is not of type number', function (done) {
-      const cachePath = path.join(__dirname, '../build/cache')
+      const cachePath = FIXTURE_CACHE
       const memoize = memoizeFs({cachePath: cachePath})
       memoize.fn(function () {
       }, {maxAge: true}).then(function () {
@@ -154,7 +224,7 @@ describe('memoize-fs', function () {
 
   describe('process fn', function () {
     it('should not cache the result of a memoized function if an exception is raised during execution', function (done) {
-      const cachePath = path.join(__dirname, '../build/cache')
+      const cachePath = FIXTURE_CACHE
       const memoize = memoizeFs({cachePath: cachePath})
       memoize.fn(function () {
         throw new Error('qux')
@@ -176,7 +246,7 @@ describe('memoize-fs', function () {
     })
 
     it('should not cache the result of a memoized promisified function if an exception is raised during execution', function (done) {
-      const cachePath = path.join(__dirname, '../build/cache')
+      const cachePath = FIXTURE_CACHE
       const memoize = memoizeFs({cachePath: cachePath})
       memoize.fn(function () {
         return new Promise(function (resolve, reject) {
@@ -202,7 +272,7 @@ describe('memoize-fs', function () {
     })
 
     it('should cache the result of a memoized function on first execution to its cache folder', function (done) {
-      const cachePath = path.join(__dirname, '../build/cache')
+      const cachePath = FIXTURE_CACHE
       const memoize = memoizeFs({cachePath: cachePath})
       let c = 3
       memoize.fn(function (a, b) {
@@ -227,7 +297,7 @@ describe('memoize-fs', function () {
     })
 
     it('should cache the result of a memoized function on first execution to its cache folder with salt', function (done) {
-      const cachePath = path.join(__dirname, '../build/cache')
+      const cachePath = FIXTURE_CACHE
       const memoize = memoizeFs({cachePath: cachePath})
       let c = 3
       memoize.fn(function (a, b) {
@@ -255,7 +325,7 @@ describe('memoize-fs', function () {
     })
 
     it('should cache the result of a memoized function on first execution to the root cache folder if no cache id is provided', function (done) {
-      const cachePath = path.join(__dirname, '../build/cache')
+      const cachePath = FIXTURE_CACHE
       const memoize = memoizeFs({cachePath: cachePath})
       const c = 3
       memoize.fn(function (a, b) {
@@ -276,7 +346,7 @@ describe('memoize-fs', function () {
     })
 
     it('should return the cached result with the value undefined of a previously memoized function with return type void', function (done) {
-      const cachePath = path.join(__dirname, '../build/cache')
+      const cachePath = FIXTURE_CACHE
       const memoize = memoizeFs({cachePath: cachePath})
       let c = 0
       memoize.fn(function () {
@@ -302,7 +372,7 @@ describe('memoize-fs', function () {
     })
 
     it('should return the cached result of type number of a previously memoized function', function (done) {
-      const cachePath = path.join(__dirname, '../build/cache')
+      const cachePath = FIXTURE_CACHE
       const memoize = memoizeFs({cachePath: cachePath})
       let c = 3
       memoize.fn(function (a, b) {
@@ -327,7 +397,7 @@ describe('memoize-fs', function () {
     })
 
     it('should return the cached result of type number of a previously memoized function cached in the root cache folder if no cache id is provided', function (done) {
-      const cachePath = path.join(__dirname, '../build/cache')
+      const cachePath = FIXTURE_CACHE
       const memoize = memoizeFs({cachePath: cachePath})
       let c = 3
       memoize.fn(function (a, b) {
@@ -352,7 +422,7 @@ describe('memoize-fs', function () {
     })
 
     it('should return the cached result of type string of a previously memoized function', function (done) {
-      const cachePath = path.join(__dirname, '../build/cache')
+      const cachePath = FIXTURE_CACHE
       const memoize = memoizeFs({cachePath: cachePath})
       let c = 3
       memoize.fn(function (a, b) {
@@ -377,7 +447,7 @@ describe('memoize-fs', function () {
     })
 
     it('should return the cached result of type string with lots of quotation marks in it of a previously memoized function', function (done) {
-      const cachePath = path.join(__dirname, '../build/cache')
+      const cachePath = FIXTURE_CACHE
       const memoize = memoizeFs({cachePath: cachePath})
       memoize.fn(function (a, b) {
         return '"{"foo": "bar", "qux": "\'sas\'\"quatch\""}"' + (a + b)
@@ -400,7 +470,7 @@ describe('memoize-fs', function () {
     })
 
     it('should return the cached result with the value undefined of a previously memoized function', function (done) {
-      const cachePath = path.join(__dirname, '../build/cache')
+      const cachePath = FIXTURE_CACHE
       const memoize = memoizeFs({cachePath: cachePath})
       let c
       memoize.fn(function (a, b) {
@@ -425,7 +495,7 @@ describe('memoize-fs', function () {
     })
 
     it('should return the cached result with the value null of a previously memoized function', function (done) {
-      const cachePath = path.join(__dirname, '../build/cache')
+      const cachePath = FIXTURE_CACHE
       const memoize = memoizeFs({cachePath: cachePath})
       let c = null
       memoize.fn(function (a, b) {
@@ -450,7 +520,7 @@ describe('memoize-fs', function () {
     })
 
     it('should return the cached result with the value NaN of a previously memoized function converting NaN to undefined', function (done) {
-      const cachePath = path.join(__dirname, '../build/cache')
+      const cachePath = FIXTURE_CACHE
       const memoize = memoizeFs({cachePath: cachePath})
       let c
       memoize.fn(function (a, b) {
@@ -475,7 +545,7 @@ describe('memoize-fs', function () {
     })
 
     it('should return the cached result of type object of a previously memoized function', function (done) {
-      const cachePath = path.join(__dirname, '../build/cache')
+      const cachePath = FIXTURE_CACHE
       const memoize = memoizeFs({cachePath: cachePath})
       let c = 3
       const Circ = function () {
@@ -550,7 +620,7 @@ describe('memoize-fs', function () {
     })
 
     it('should return the cached result of a previously memoized promisified async function', function (done) {
-      const cachePath = path.join(__dirname, '../build/cache')
+      const cachePath = FIXTURE_CACHE
       const memoize = memoizeFs({cachePath: cachePath})
       let c = 3
       memoize.fn(function (a, b) {
@@ -579,7 +649,7 @@ describe('memoize-fs', function () {
     })
 
     it('should ignore arguments of type function silently during serialization', function (done) {
-      const cachePath = path.join(__dirname, '../build/cache')
+      const cachePath = FIXTURE_CACHE
       const memoize = memoizeFs({cachePath: cachePath})
       let d = 3
       memoize.fn(function (a, b, c) {
@@ -608,7 +678,7 @@ describe('memoize-fs', function () {
     })
 
     it('should ignore argument attributes of type function silently during serialization', function (done) {
-      const cachePath = path.join(__dirname, '../build/cache')
+      const cachePath = FIXTURE_CACHE
       const memoize = memoizeFs({cachePath: cachePath})
       let d = 3
       memoize.fn(function (a, b, c) {
@@ -643,7 +713,7 @@ describe('memoize-fs', function () {
 
   describe('async', function () {
     it('should return a rejecting promise instance if option async is provided but function has no callback', function (done) {
-      const cachePath = path.join(__dirname, '../build/cache')
+      const cachePath = FIXTURE_CACHE
       const memoize = memoizeFs({cachePath: cachePath})
       memoize.fn(function (a, cb) {
         cb(a)
@@ -658,11 +728,11 @@ describe('memoize-fs', function () {
     })
 
     it('should not cache the result of a memoized async function if its callback receives an error', function (done) {
-      const cachePath = path.join(__dirname, '../build/cache')
+      const cachePath = FIXTURE_CACHE
       const memoize = memoizeFs({cachePath: cachePath})
       memoize.fn(function (cb) {
         setTimeout(function () {
-          cb(new Error('qux'))
+          cb(new Error('fake error'))
         }, 100)
       }, {cacheId: 'foobar'}).then(function (memFn) {
         memFn(function (err) { // eslint-disable-line handle-callback-err
@@ -683,7 +753,7 @@ describe('memoize-fs', function () {
     })
 
     it('should return the cached result of a previously memoized async function', function (done) {
-      const cachePath = path.join(__dirname, '../build/cache')
+      const cachePath = FIXTURE_CACHE
       const memoize = memoizeFs({cachePath: cachePath})
       let c = 3
       let d
@@ -722,7 +792,7 @@ describe('memoize-fs', function () {
     })
 
     it('should return the cached result of a previously memoized async function with a callback which only excepts an error argument', function (done) {
-      const cachePath = path.join(__dirname, '../build/cache')
+      const cachePath = FIXTURE_CACHE
       const memoize = memoizeFs({cachePath: cachePath})
       let c = true
       let d
@@ -759,7 +829,7 @@ describe('memoize-fs', function () {
     })
 
     it('should return the cached result of a previously memoized async function which only excepts a callback argument', function (done) {
-      const cachePath = path.join(__dirname, '../build/cache')
+      const cachePath = FIXTURE_CACHE
       const memoize = memoizeFs({cachePath: cachePath})
       let c = true
       let d
@@ -796,7 +866,7 @@ describe('memoize-fs', function () {
     })
 
     it('should only run the memoized function once even when called with the same arguments on the same tick', function (done) {
-      const cachePath = path.join(__dirname, '../build/cache')
+      const cachePath = FIXTURE_CACHE
       const memoize = memoizeFs({cachePath: cachePath})
       let n = 0
       memoize.fn(function (cb) {
@@ -812,7 +882,7 @@ describe('memoize-fs', function () {
 
   describe('force recaching', function () {
     it('should not recache the result of a memoized function on second execution if force option is not set', function (done) {
-      const cachePath = path.join(__dirname, '../build/cache')
+      const cachePath = FIXTURE_CACHE
       const memoize = memoizeFs({ cachePath: cachePath })
       let c = 3
       memoize.fn(function (a, b) { return a + b + c }, { cacheId: 'foobar' }).then(function (memFn) {
@@ -837,7 +907,7 @@ describe('memoize-fs', function () {
     })
 
     it('should recache the result of a memoized function on second execution if force option is set', function (done) {
-      const cachePath = path.join(__dirname, '../build/cache')
+      const cachePath = FIXTURE_CACHE
       const memoize = memoizeFs({cachePath: cachePath})
       let c = 3
       memoize.fn(function (a, b) { return a + b + c }, {cacheId: 'foobar'}).then(function (memFn) {
@@ -867,14 +937,14 @@ describe('memoize-fs', function () {
 
   describe('noBody', function () {
     it('should cache the result of a memoized function on second execution with option noBody set to true with different function names', function (done) {
-      const cachePath = path.join(__dirname, '../build/cache')
+      const cachePath = FIXTURE_CACHE
       const memoize = memoizeFs({cachePath: cachePath})
       let c = 3
       memoize.fn(function foo (a, b) {
         return a + b + c
       }, {
         cacheId: 'foobar',
-        serialize: 'qux',
+        salt: 'qux',
         noBody: true
       }).then(function (memFn) {
         return memFn(1, 2)
@@ -884,7 +954,7 @@ describe('memoize-fs', function () {
           return a + b + c
         }, {
           cacheId: 'foobar',
-          serialize: 'qux',
+          salt: 'qux',
           noBody: true
         })
       }).then(function (memFn) {
@@ -904,14 +974,14 @@ describe('memoize-fs', function () {
     })
 
     it('should not cache the result of a memoized function on second execution with option noBody not set with different function names', function (done) {
-      const cachePath = path.join(__dirname, '../build/cache')
+      const cachePath = FIXTURE_CACHE
       const memoize = memoizeFs({cachePath: cachePath})
       let c = 3
       memoize.fn(function foo (a, b) {
         return a + b + c
       }, {
         cacheId: 'foobar',
-        serialize: 'qux'
+        salt: 'qux'
       }).then(function (memFn) {
         return memFn(1, 2)
       }).then(function (result) {
@@ -920,7 +990,7 @@ describe('memoize-fs', function () {
           return a + b + c
         }, {
           cacheId: 'foobar',
-          serialize: 'qux'
+          salt: 'qux'
         })
       }).then(function (memFn) {
         c = 999
@@ -941,14 +1011,14 @@ describe('memoize-fs', function () {
 
   describe('astBody', function () {
     it('should cache the result of a memoized function on second execution with option astBody set to true with equivalent function ASTs', function (done) {
-      const cachePath = path.join(__dirname, '../build/cache')
+      const cachePath = FIXTURE_CACHE
       const memoize = memoizeFs({cachePath: cachePath})
       memoize.fn(function foo () {
         // double quoted
         return "string" // eslint-disable-line quotes
       }, {
         cacheId: 'foobar',
-        serialize: 'qux',
+        salt: 'qux',
         astBody: true
       }).then(function (memFn) {
         return memFn()
@@ -959,7 +1029,7 @@ describe('memoize-fs', function () {
           return 'string'
         }, {
           cacheId: 'foobar',
-          serialize: 'qux',
+          salt: 'qux',
           astBody: true
         })
       }).then(function (memFn) {
@@ -977,7 +1047,7 @@ describe('memoize-fs', function () {
       }).catch(done)
     })
     it('should work with ES2020', async () => {
-      const cachePath = path.join(__dirname, '../build/cache')
+      const cachePath = FIXTURE_CACHE
       const memoize = memoizeFs({cachePath: cachePath})
       let idx = 0
 
@@ -1016,7 +1086,7 @@ describe('memoize-fs', function () {
 
   describe('invalidate cache', function () {
     it('should recache the result of a memoized function after invalidating the cache before the second execution', function (done) {
-      const cachePath = path.join(__dirname, '../build/cache')
+      const cachePath = FIXTURE_CACHE
       const memoize = memoizeFs({cachePath: cachePath})
       let c = 3
       memoize.fn(function (a, b) {
@@ -1047,7 +1117,7 @@ describe('memoize-fs', function () {
     })
 
     it('should recache the result of a memoized function after invalidating the root cache by not providing a cache id before the second execution', function (done) {
-      const cachePath = path.join(__dirname, '../build/cache')
+      const cachePath = FIXTURE_CACHE
       const memoize = memoizeFs({cachePath: cachePath})
       let c = 3
       memoize.fn(function (a, b) {
@@ -1085,7 +1155,7 @@ describe('memoize-fs', function () {
     })
 
     it('should invalidate cache after timeout with maxAge option set', function (done) {
-      const cachePath = path.join(__dirname, '../build/cache')
+      const cachePath = FIXTURE_CACHE
       const memoize = memoizeFs({cachePath: cachePath})
       let c = 3
       memoize.fn(function (a, b) {
@@ -1119,7 +1189,7 @@ describe('memoize-fs', function () {
     })
 
     it('should not throw if it fails to invalidate cache after timeout with maxAge option set, because already invalidated manually', function (done) {
-      const cachePath = path.join(__dirname, '../build/cache')
+      const cachePath = FIXTURE_CACHE
       const memoize = memoizeFs({cachePath: cachePath})
       let c = 3
       memoize.fn(function (a, b) {
@@ -1178,8 +1248,19 @@ describe('memoize-fs', function () {
       })
     })
 
+    it('should NOT throw error if cache dir exists and opts.throwError is `false`', (done) => {
+      const cachePath = path.join(__dirname, '..')
+      const memoize = memoizeFs({cachePath: cachePath, throwError: false})
+      memoize.fn(function () {
+      }, {cacheId: 'README.md'}).then(function () {
+        done()
+      }).catch(function () {
+        done(new Error('throws unexpected error'))
+      })
+    })
+
     it('should throw an error when trying to write cache on a file without having the necessary permission', function (done) {
-      const cachePath = path.join(__dirname, '../build/cache')
+      const cachePath = FIXTURE_CACHE
       const memoize = memoizeFs({cachePath: cachePath})
       memoize.fn(function () { return 1 }, {cacheId: 'foobar'}).then(function (memFn) {
         return memFn()
@@ -1202,7 +1283,7 @@ describe('memoize-fs', function () {
     })
 
     it('should throw an error trying to invalidate cache without having the necessary permission', function (done) {
-      const cachePath = path.join(__dirname, '../build/cache')
+      const cachePath = FIXTURE_CACHE
       const memoize = memoizeFs({cachePath: cachePath})
       memoize.fn(function () {
         return 1
@@ -1231,7 +1312,7 @@ describe('memoize-fs', function () {
     })
 
     it('should throw an error when trying to memoize a function with options of invalid type', function (done) {
-      const cachePath = path.join(__dirname, '../build/cache')
+      const cachePath = FIXTURE_CACHE
       const memoize = memoizeFs({cachePath: cachePath})
       memoize.fn(function () {
       }, true).then(function () {
@@ -1243,7 +1324,7 @@ describe('memoize-fs', function () {
     })
 
     it('should throw if it fails to invalidate cache after timeout with maxAge option set, because of EPERM error', function (done) {
-      const cachePath = path.join(__dirname, '../build/cache')
+      const cachePath = FIXTURE_CACHE
       const memoize = memoizeFs({cachePath: cachePath})
       const c = 3