diff --git a/src/passport-saml/algorithms.ts b/src/passport-saml/algorithms.ts
index fc0e4029..3405dacf 100644
--- a/src/passport-saml/algorithms.ts
+++ b/src/passport-saml/algorithms.ts
@@ -1,4 +1,4 @@
-import crypto from 'crypto';
+import * as crypto from 'crypto';
 
 export function getSigningAlgorithm (shortName: string): string {
   switch(shortName) {
diff --git a/src/passport-saml/index.ts b/src/passport-saml/index.ts
index c01e65b1..2dbfd75e 100644
--- a/src/passport-saml/index.ts
+++ b/src/passport-saml/index.ts
@@ -1,6 +1,6 @@
 import type { CacheItem, CacheProvider} from './inmemory-cache-provider';
 import { SAML } from './saml';
-import Strategy from './strategy';
+import Strategy = require('./strategy');
 import type { Profile, VerifiedCallback, VerifyWithRequest, VerifyWithoutRequest } from './types';
 
 export { SAML, Strategy, CacheItem, CacheProvider, Profile, VerifiedCallback, VerifyWithRequest, VerifyWithoutRequest };
diff --git a/src/passport-saml/multiSamlStrategy.ts b/src/passport-saml/multiSamlStrategy.ts
index 0d6b9d36..d66aaa85 100644
--- a/src/passport-saml/multiSamlStrategy.ts
+++ b/src/passport-saml/multiSamlStrategy.ts
@@ -1,7 +1,7 @@
-import util from 'util';
+import * as util from 'util';
 import * as saml from './saml';
 import {CacheProvider as InMemoryCacheProvider} from './inmemory-cache-provider';
-import SamlStrategy from './strategy';
+import SamlStrategy = require('./strategy');
 
 function MultiSamlStrategy (options, verify) {
   if (!options || typeof options.getSamlOptions != 'function') {
diff --git a/src/passport-saml/saml.ts b/src/passport-saml/saml.ts
index 54a381a5..e0ed1138 100644
--- a/src/passport-saml/saml.ts
+++ b/src/passport-saml/saml.ts
@@ -1,15 +1,15 @@
 import Debug from 'debug';
 const debug = Debug('passport-saml');
-import zlib from 'zlib';
-import xml2js from 'xml2js';
-import xmlCrypto, { xpath } from 'xml-crypto';
-import crypto, { KeyLike } from 'crypto';
-import xmldom from 'xmldom';
-import url from 'url';
-import querystring from 'querystring';
-import xmlbuilder from 'xmlbuilder';
-import xmlenc from 'xml-encryption';
-import util, { promisify } from 'util';
+import * as zlib from 'zlib';
+import * as xml2js from 'xml2js';
+import * as xmlCrypto from 'xml-crypto';
+import * as crypto from 'crypto';
+import * as xmldom from 'xmldom';
+import * as url from 'url';
+import * as querystring from 'querystring';
+import * as xmlbuilder from 'xmlbuilder';
+import * as xmlenc from 'xml-encryption';
+import * as util from 'util';
 import {CacheProvider as InMemoryCacheProvider} from './inmemory-cache-provider';
 import * as algorithms from './algorithms';
 import { signAuthnRequestPost } from './saml-post-signing';
@@ -69,7 +69,7 @@ function processValidlySignedSamlLogout(self: SAML, doc, dom, callback) {
 }
 
 function callBackWithNameID(nameid, callback) {
-  const format = xpath(nameid, "@Format") as Node[];
+  const format = xmlCrypto.xpath(nameid, "@Format") as Node[];
   return callback(null, {
     value: nameid.textContent,
     format: format && format[0] && format[0].nodeValue
@@ -241,7 +241,7 @@ class SAML {
 
     (async () => {
       if(this.options.validateInResponseTo) {
-        return promisify(this.cacheProvider.save).bind(this.cacheProvider)(id, instant);
+        return util.promisify(this.cacheProvider.save).bind(this.cacheProvider)(id, instant);
       } else {
         return;
       }
@@ -619,7 +619,7 @@ class SAML {
                         "namespace-uri(.)='http://www.w3.org/2000/09/xmldsig#' and " +
                         "descendant::*[local-name(.)='Reference' and @URI='#"+currentNode.getAttribute('ID')+"']" +
                         "]";
-    const signatures = xpath(currentNode, xpathSigQuery);
+    const signatures = xmlCrypto.xpath(currentNode, xpathSigQuery);
     // This function is expecting to validate exactly one signature, so if we find more or fewer
     //   than that, reject.
     if (signatures.length != 1) {
@@ -653,7 +653,7 @@ class SAML {
       return false;
     // If we find any extra referenced nodes, reject.  (xml-crypto only verifies one digest, so
     //   multiple candidate references is bad news)
-    const totalReferencedNodes = xpath(currentNode.ownerDocument,
+    const totalReferencedNodes = xmlCrypto.xpath(currentNode.ownerDocument,
                                     "//*[@" + idAttribute + "='" + refId + "']");
 
     if (totalReferencedNodes.length > 1) {
@@ -673,7 +673,7 @@ class SAML {
       if (!Object.prototype.hasOwnProperty.call(doc, 'documentElement'))
         throw new Error('SAMLResponse is not valid base64-encoded XML');
 
-      inResponseTo = xpath(doc, "/*[local-name()='Response']/@InResponseTo");
+      inResponseTo = xmlCrypto.xpath(doc, "/*[local-name()='Response']/@InResponseTo");
 
       if (inResponseTo) {
         inResponseTo = inResponseTo.length ? inResponseTo[0].nodeValue : null;
@@ -689,8 +689,8 @@ class SAML {
         validSignature = true;
       }
 
-      const assertions = xpath(doc, "/*[local-name()='Response']/*[local-name()='Assertion']");
-      const encryptedAssertions = xpath(doc,
+      const assertions = xmlCrypto.xpath(doc, "/*[local-name()='Response']/*[local-name()='Assertion']");
+      const encryptedAssertions = xmlCrypto.xpath(doc,
                                       "/*[local-name()='Response']/*[local-name()='EncryptedAssertion']");
 
       if (assertions.length + encryptedAssertions.length > 1) {
@@ -718,7 +718,7 @@ class SAML {
         return util.promisify(xmlenc.decrypt).bind(xmlenc)(encryptedAssertionXml, xmlencOptions)
         .then(decryptedXml => {
           const decryptedDoc = new xmldom.DOMParser().parseFromString(decryptedXml);
-          const decryptedAssertions = xpath(decryptedDoc, "/*[local-name()='Assertion']");
+          const decryptedAssertions = xmlCrypto.xpath(decryptedDoc, "/*[local-name()='Assertion']");
           if (decryptedAssertions.length != 1)
             throw new Error('Invalid EncryptedAssertion content');
 
@@ -1194,8 +1194,8 @@ class SAML {
   }
 
   getNameID(self, doc, callback) {
-    const nameIds = xpath(doc, "/*[local-name()='LogoutRequest']/*[local-name()='NameID']");
-    const encryptedIds = xpath(doc,
+    const nameIds = xmlCrypto.xpath(doc, "/*[local-name()='LogoutRequest']/*[local-name()='NameID']");
+    const encryptedIds = xmlCrypto.xpath(doc,
       "/*[local-name()='LogoutRequest']/*[local-name()='EncryptedID']") as Node[];
 
     if (nameIds.length + encryptedIds.length > 1) {
@@ -1209,7 +1209,7 @@ class SAML {
         return callback(new Error('No decryption key for encrypted SAML response'));
       }
 
-      const encryptedDatas = xpath(encryptedIds[0], "./*[local-name()='EncryptedData']");
+      const encryptedDatas = xmlCrypto.xpath(encryptedIds[0], "./*[local-name()='EncryptedData']");
 
       if (encryptedDatas.length !== 1) {
         return callback(new Error('Invalid LogoutRequest'));
@@ -1220,7 +1220,7 @@ class SAML {
       return util.promisify(xmlenc.decrypt).bind(xmlenc)(encryptedDataXml, xmlencOptions)
         .then(function (decryptedXml) {
           const decryptedDoc = new xmldom.DOMParser().parseFromString(decryptedXml);
-          const decryptedIds = xpath(decryptedDoc, "/*[local-name()='NameID']");
+          const decryptedIds = xmlCrypto.xpath(decryptedDoc, "/*[local-name()='NameID']");
           if (decryptedIds.length !== 1) {
             return callback(new Error('Invalid EncryptedAssertion content'));
           }
@@ -1325,7 +1325,7 @@ class SAML {
     return xmlbuilder.create(metadata).end({ pretty: true, indent: '  ', newline: '\n' });
   }
 
-  keyToPEM(key: KeyLike) {
+  keyToPEM(key: crypto.KeyLike) {
     if (!key || typeof key !== 'string') return key;
 
     const lines = key.split('\n');
diff --git a/src/passport-saml/strategy.ts b/src/passport-saml/strategy.ts
index 086f5eb2..d6668d92 100644
--- a/src/passport-saml/strategy.ts
+++ b/src/passport-saml/strategy.ts
@@ -1,7 +1,7 @@
-import passport from 'passport-strategy';
-import util from 'util';
+import * as passport from 'passport-strategy';
+import * as util from 'util';
 import * as saml from './saml';
-import url from 'url';
+import * as url from 'url';
 import { AuthenticateOptions, AuthorizeOptions, SamlConfig, VerifyWithoutRequest, VerifyWithRequest } from './types';
 import type { Request } from 'express';
 import { Profile } from './types';
diff --git a/src/passport-saml/types.ts b/src/passport-saml/types.ts
index 91fdc665..944e0161 100644
--- a/src/passport-saml/types.ts
+++ b/src/passport-saml/types.ts
@@ -1,5 +1,5 @@
-import type express from 'express';
-import passport from 'passport';
+import type * as express from 'express';
+import * as passport from 'passport';
 import type { CacheProvider } from './inmemory-cache-provider';
 
 export type CertCallback = (callback: (err: Error | null, cert?: string | string[]) => void) => void;
@@ -73,10 +73,9 @@ export type Profile = {
   } & {
     [attributeName: string]: unknown; // arbitrary `AttributeValue`s
   };
-  
+
 export type VerifiedCallback = (err: Error | null, user?: Record<string, unknown>, info?: Record<string, unknown>) => void;
 
 export type VerifyWithRequest = (req: express.Request, profile: Profile, done: VerifiedCallback) => void;
 
 export type VerifyWithoutRequest = (profile: Profile, done: VerifiedCallback) => void;
-  
\ No newline at end of file
diff --git a/tsconfig.json b/tsconfig.json
index 4925ce4c..88d203b4 100644
--- a/tsconfig.json
+++ b/tsconfig.json
@@ -48,7 +48,7 @@
     // "typeRoots": [],                       /* List of folders to include type definitions from. */
     // "types": [],                           /* Type declaration files to be included in compilation. */
     // "allowSyntheticDefaultImports": true,  /* Allow default imports from modules with no default export. This does not affect code emit, just typechecking. */
-    "esModuleInterop": true,                  /* Enables emit interoperability between CommonJS and ES Modules via creation of namespace objects for all imports. Implies 'allowSyntheticDefaultImports'. */
+    // "esModuleInterop": true,                  /* Enables emit interoperability between CommonJS and ES Modules via creation of namespace objects for all imports. Implies 'allowSyntheticDefaultImports'. */
     // "preserveSymlinks": true,              /* Do not resolve the real path of symlinks. */
     // "allowUmdGlobalAccess": true,          /* Allow accessing UMD globals from modules. */