diff --git a/package.json b/package.json
index e4dc466d..1a346ab7 100644
--- a/package.json
+++ b/package.json
@@ -33,7 +33,8 @@
     "go:petstore": "yarn counterfact https://petstore3.swagger.io/api/v3/openapi.json out",
     "go:petstore2": "yarn counterfact  https://petstore.swagger.io/v2/swagger.json out",
     "go:example": "yarn counterfact ./openapi-example.yaml out --open",
-    "counterfact": "./bin/counterfact.js"
+    "counterfact": "./bin/counterfact.js",
+    "postinstall": "patch-package"
   },
   "devDependencies": {
     "@changesets/cli": "2.26.2",
@@ -59,6 +60,7 @@
     "jest": "28.1.2",
     "node-mocks-http": "^1.12.2",
     "nodemon": "3.0.1",
+    "patch-package": "^8.0.0",
     "stryker-cli": "1.0.2",
     "supertest": "6.3.3"
   },
diff --git a/patches/tsutils+3.21.0.patch b/patches/tsutils+3.21.0.patch
new file mode 100644
index 00000000..dd419af0
--- /dev/null
+++ b/patches/tsutils+3.21.0.patch
@@ -0,0 +1,44 @@
+diff --git a/node_modules/tsutils/util/usage.js b/node_modules/tsutils/util/usage.js
+index fa24e64..9818b0a 100644
+--- a/node_modules/tsutils/util/usage.js
++++ b/node_modules/tsutils/util/usage.js
+@@ -25,7 +25,7 @@ function getUsageDomain(node) {
+     const parent = node.parent;
+     switch (parent.kind) {
+         case ts.SyntaxKind.TypeReference:
+-            return node.originalKeywordKind !== ts.SyntaxKind.ConstKeyword ? 2 /* Type */ : undefined;
++            return ts.identifierToKeywordKind(node) !== ts.SyntaxKind.ConstKeyword ? 2 /* Type */ : undefined;
+         case ts.SyntaxKind.ExpressionWithTypeArguments:
+             return parent.parent.token === ts.SyntaxKind.ImplementsKeyword ||
+                 parent.parent.parent.kind === ts.SyntaxKind.InterfaceDeclaration
+@@ -116,7 +116,7 @@ function getDeclarationDomain(node) {
+         case ts.SyntaxKind.ModuleDeclaration:
+             return 1 /* Namespace */;
+         case ts.SyntaxKind.Parameter:
+-            if (node.parent.parent.kind === ts.SyntaxKind.IndexSignature || node.originalKeywordKind === ts.SyntaxKind.ThisKeyword)
++            if (node.parent.parent.kind === ts.SyntaxKind.IndexSignature || ts.identifierToKeywordKind(node) === ts.SyntaxKind.ThisKeyword)
+                 return;
+         // falls through
+         case ts.SyntaxKind.BindingElement:
+@@ -525,7 +525,7 @@ class UsageWalker {
+                 case ts.SyntaxKind.Parameter:
+                     if (node.parent.kind !== ts.SyntaxKind.IndexSignature &&
+                         (node.name.kind !== ts.SyntaxKind.Identifier ||
+-                            node.name.originalKeywordKind !== ts.SyntaxKind.ThisKeyword))
++                            ts.identifierToKeywordKind(node.name) !== ts.SyntaxKind.ThisKeyword))
+                         this._handleBindingName(node.name, false, false);
+                     break;
+                 case ts.SyntaxKind.EnumMember:
+diff --git a/node_modules/tsutils/util/util.js b/node_modules/tsutils/util/util.js
+index 0109fea..81aa517 100644
+--- a/node_modules/tsutils/util/util.js
++++ b/node_modules/tsutils/util/util.js
+@@ -37,7 +37,7 @@ function isKeywordKind(kind) {
+ }
+ exports.isKeywordKind = isKeywordKind;
+ function isThisParameter(parameter) {
+-    return parameter.name.kind === ts.SyntaxKind.Identifier && parameter.name.originalKeywordKind === ts.SyntaxKind.ThisKeyword;
++    return parameter.name.kind === ts.SyntaxKind.Identifier && ts.identifierToKeywordKind(parameter.name) === ts.SyntaxKind.ThisKeyword;
+ }
+ exports.isThisParameter = isThisParameter;
+ function getModifier(node, kind) {
diff --git a/yarn.lock b/yarn.lock
index d121bc77..c3efaba2 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -3506,6 +3506,11 @@
     "@typescript-eslint/types" "6.4.1"
     eslint-visitor-keys "^3.4.1"
 
+"@yarnpkg/lockfile@^1.1.0":
+  version "1.1.0"
+  resolved "https://registry.yarnpkg.com/@yarnpkg/lockfile/-/lockfile-1.1.0.tgz#e77a97fbd345b76d83245edcd17d393b1b41fb31"
+  integrity sha512-GpSwvyXOcOOlV70vbnzjj4fW5xW/FdUF6nQEt1ENy7m4ZCczi1+/buVUPAqmGfqznsORNFzUMjctTIp8a9tuCQ==
+
 abbrev@1:
   version "1.1.1"
   resolved "https://registry.yarnpkg.com/abbrev/-/abbrev-1.1.1.tgz#f8f2c887ad10bf67f634f005b6987fed3179aac8"
@@ -3839,6 +3844,11 @@ asynckit@^0.4.0:
   resolved "https://registry.yarnpkg.com/asynckit/-/asynckit-0.4.0.tgz#c79ed97f7f34cb8f2ba1bc9790bcc366474b4b79"
   integrity sha512-Oei9OH4tRh0YqU3GxhX79dM/mwVgvbZJaSNaRk+bshkj0S5cfHcgYakreBjrHwatXKbz+IoIdYLxrKim2MjW0Q==
 
+at-least-node@^1.0.0:
+  version "1.0.0"
+  resolved "https://registry.yarnpkg.com/at-least-node/-/at-least-node-1.0.0.tgz#602cd4b46e844ad4effc92a8011a3c46e0238dc2"
+  integrity sha512-+q/t7Ekv1EDY2l6Gda6LLiX14rU9TV20Wa3ofeQmwPFZbOMo9DXrLbOjFaaclkXKWidIaopwAObQDqwWtGUjqg==
+
 atob@^2.1.2:
   version "2.1.2"
   resolved "https://registry.yarnpkg.com/atob/-/atob-2.1.2.tgz#6d9517eb9e030d2436666651e86bd9f6f13533c9"
@@ -4268,7 +4278,7 @@ ci-info@^3.1.0, ci-info@^3.1.1, ci-info@^3.2.0:
   resolved "https://registry.yarnpkg.com/ci-info/-/ci-info-3.3.2.tgz#6d2967ffa407466481c6c90b6e16b3098f080128"
   integrity sha512-xmDt/QIAdeZ9+nfdPsaBCpMvHNLFiLdjj59qjqn+6iPe6YmHGQ35sBnQ8uslRBXFmXkiZQOJRjvQeoGppoTjjg==
 
-ci-info@^3.8.0:
+ci-info@^3.7.0, ci-info@^3.8.0:
   version "3.8.0"
   resolved "https://registry.yarnpkg.com/ci-info/-/ci-info-3.8.0.tgz#81408265a5380c929f0bc665d62256628ce9ef91"
   integrity sha512-eXTggHWSooYhq49F2opQhuHWgzucfF2YgODK4e1566GQs5BIfP30B0oenwBJHfWxAs2fyPB1s7Mg949zLf61Yw==
@@ -6295,6 +6305,13 @@ find-yarn-workspace-root2@1.2.16:
     micromatch "^4.0.2"
     pkg-dir "^4.2.0"
 
+find-yarn-workspace-root@^2.0.0:
+  version "2.0.0"
+  resolved "https://registry.yarnpkg.com/find-yarn-workspace-root/-/find-yarn-workspace-root-2.0.0.tgz#f47fb8d239c900eb78179aa81b66673eac88f7bd"
+  integrity sha512-1IMnbjt4KzsQfnhnzNd8wUEgXZ44IzZaZmnLYx7D5FZlaHt2gW20Cri8Q+E/t5tIj4+epTBub+2Zxu/vNILzqQ==
+  dependencies:
+    micromatch "^4.0.2"
+
 flat-cache@^3.0.4:
   version "3.0.4"
   resolved "https://registry.yarnpkg.com/flat-cache/-/flat-cache-3.0.4.tgz#61b0338302b2fe9f957dcc32fc2a87f1c3048b11"
@@ -6412,6 +6429,16 @@ fs-extra@^8.1.0:
     jsonfile "^4.0.0"
     universalify "^0.1.0"
 
+fs-extra@^9.0.0:
+  version "9.1.0"
+  resolved "https://registry.yarnpkg.com/fs-extra/-/fs-extra-9.1.0.tgz#5954460c764a8da2094ba3554bf839e6b9a7c86d"
+  integrity sha512-hcg3ZmepS30/7BSFqRvoo3DOMQu7IjqxO5nCDt+zM9XWjb33Wg7ziNT+Qvqbuc3+gWpzO02JubVyk2G4Zvo1OQ==
+  dependencies:
+    at-least-node "^1.0.0"
+    graceful-fs "^4.2.0"
+    jsonfile "^6.0.1"
+    universalify "^2.0.0"
+
 fs.realpath@^1.0.0:
   version "1.0.0"
   resolved "https://registry.yarnpkg.com/fs.realpath/-/fs.realpath-1.0.0.tgz#1504ad2523158caa40db4a2787cb01411994ea4f"
@@ -6617,16 +6644,16 @@ gopd@^1.0.1:
   dependencies:
     get-intrinsic "^1.1.3"
 
+graceful-fs@^4.1.11, graceful-fs@^4.1.6, graceful-fs@^4.2.0, graceful-fs@^4.2.4:
+  version "4.2.11"
+  resolved "https://registry.yarnpkg.com/graceful-fs/-/graceful-fs-4.2.11.tgz#4183e4e8bf08bb6e05bbb2f7d2e0c8f712ca40e3"
+  integrity sha512-RbJ5/jmFcNNCcDV5o9eTnBLJ/HszWV0P73bc+Ff4nS/rJj+YaS6IGyiOL0VoBYX+l1Wrl3k63h/KrH+nhJ0XvQ==
+
 graceful-fs@^4.1.2, graceful-fs@^4.1.5, graceful-fs@^4.2.9:
   version "4.2.10"
   resolved "https://registry.yarnpkg.com/graceful-fs/-/graceful-fs-4.2.10.tgz#147d3a006da4ca3ce14728c7aefc287c367d7a6c"
   integrity sha512-9ByhssR2fPVsNZj478qUUbKfmL0+t5BDVyjShtyZZLiK7ZDAArFFfopyOTj0M05wE2tJPisA4iTnnXl2YoPvOA==
 
-graceful-fs@^4.1.6, graceful-fs@^4.2.0, graceful-fs@^4.2.4:
-  version "4.2.11"
-  resolved "https://registry.yarnpkg.com/graceful-fs/-/graceful-fs-4.2.11.tgz#4183e4e8bf08bb6e05bbb2f7d2e0c8f712ca40e3"
-  integrity sha512-RbJ5/jmFcNNCcDV5o9eTnBLJ/HszWV0P73bc+Ff4nS/rJj+YaS6IGyiOL0VoBYX+l1Wrl3k63h/KrH+nhJ0XvQ==
-
 grapheme-splitter@^1.0.4:
   version "1.0.4"
   resolved "https://registry.yarnpkg.com/grapheme-splitter/-/grapheme-splitter-1.0.4.tgz#9cf3a665c6247479896834af35cf1dbb4400767e"
@@ -7323,7 +7350,7 @@ is-windows@^1.0.0:
   resolved "https://registry.yarnpkg.com/is-windows/-/is-windows-1.0.2.tgz#d1850eb9791ecd18e6182ce12a30f396634bb19d"
   integrity sha512-eXK1UInq2bPmjyX6e3VHIzMLobc4J94i4AWn+Hpq3OU5KkrRC96OAcR3PRJ/pGu6m8TRnBHP9dkXQVsT/COVIA==
 
-is-wsl@^2.2.0:
+is-wsl@^2.1.1, is-wsl@^2.2.0:
   version "2.2.0"
   resolved "https://registry.yarnpkg.com/is-wsl/-/is-wsl-2.2.0.tgz#74a4c76e77ca9fd3f932f290c17ea326cd157271"
   integrity sha512-fKzAra0rGJUUBwGBgNkHZuToZcn+TtXHpeCgmkMJMMYx1sQDYaCSyjJBSCa2nH1DGm7s3n1oBnohoVTBaN7Lww==
@@ -7869,6 +7896,13 @@ json-stable-stringify-without-jsonify@^1.0.1:
   resolved "https://registry.yarnpkg.com/json-stable-stringify-without-jsonify/-/json-stable-stringify-without-jsonify-1.0.1.tgz#9db7b59496ad3f3cfef30a75142d2d930ad72651"
   integrity sha512-Bdboy+l7tA3OGW6FjyFHWkP5LuByj1Tk33Ljyq0axyzdk9//JSi2u3fP1QSmd1KNwq6VOKYGlAu87CisVir6Pw==
 
+json-stable-stringify@^1.0.2:
+  version "1.0.2"
+  resolved "https://registry.yarnpkg.com/json-stable-stringify/-/json-stable-stringify-1.0.2.tgz#e06f23128e0bbe342dc996ed5a19e28b57b580e0"
+  integrity sha512-eunSSaEnxV12z+Z73y/j5N37/In40GK4GmsSy+tEHJMxknvqnA7/djeYtAgW0GsWHUfg+847WJjKaEylk2y09g==
+  dependencies:
+    jsonify "^0.0.1"
+
 json-stringify-safe@~5.0.1:
   version "5.0.1"
   resolved "https://registry.yarnpkg.com/json-stringify-safe/-/json-stringify-safe-5.0.1.tgz#1296a2d58fd45f19a0f6ce01d65701e2c735b6eb"
@@ -7917,6 +7951,11 @@ jsonfile@^6.0.1:
   optionalDependencies:
     graceful-fs "^4.1.6"
 
+jsonify@^0.0.1:
+  version "0.0.1"
+  resolved "https://registry.yarnpkg.com/jsonify/-/jsonify-0.0.1.tgz#2aa3111dae3d34a0f151c63f3a45d995d9420978"
+  integrity sha512-2/Ki0GcmuqSrgFyelQq9M05y7PS0mEwuIzrf3f1fPqkVDVRvZrPZtVSMHxdgo8Aq0sxAOb/cr2aqqA3LeWHVPg==
+
 jsonpath-plus@^7.2.0:
   version "7.2.0"
   resolved "https://registry.yarnpkg.com/jsonpath-plus/-/jsonpath-plus-7.2.0.tgz#7ad94e147b3ed42f7939c315d2b9ce490c5a3899"
@@ -8018,6 +8057,13 @@ kind-of@^6.0.2, kind-of@^6.0.3:
   resolved "https://registry.yarnpkg.com/kind-of/-/kind-of-6.0.3.tgz#07c05034a6c349fa06e24fa35aa76db4580ce4dd"
   integrity sha512-dcS1ul+9tmeD95T+x28/ehLgd9mENa3LsvDTtzm3vyBEO7RPptvAD+t44WVXaUjTBRcrpFeFlC8WCruUR456hw==
 
+klaw-sync@^6.0.0:
+  version "6.0.0"
+  resolved "https://registry.yarnpkg.com/klaw-sync/-/klaw-sync-6.0.0.tgz#1fd2cfd56ebb6250181114f0a581167099c2b28c"
+  integrity sha512-nIeuVSzdCCs6TDPTqI8w1Yre34sSq7AkZ4B3sfOBbI2CgVSB4Du4aLQijFU2+lhAFCwt9+42Hel6lQNIv6AntQ==
+  dependencies:
+    graceful-fs "^4.1.11"
+
 kleur@^3.0.3:
   version "3.0.3"
   resolved "https://registry.yarnpkg.com/kleur/-/kleur-3.0.3.tgz#a79c9ecc86ee1ce3fa6206d1216c501f147fc07e"
@@ -9106,6 +9152,14 @@ ono@^4.0.11:
   dependencies:
     format-util "^1.0.3"
 
+open@^7.4.2:
+  version "7.4.2"
+  resolved "https://registry.yarnpkg.com/open/-/open-7.4.2.tgz#b8147e26dcf3e426316c730089fd71edd29c2321"
+  integrity sha512-MVHddDVweXZF3awtlAS+6pgKLlm/JgxZ90+/NBurBoQctVOOB/zDdVjcyPzQ+0laDGbsWgrRkflI65sQeOgT9Q==
+  dependencies:
+    is-docker "^2.0.0"
+    is-wsl "^2.1.1"
+
 open@^9.0.0, open@^9.1.0:
   version "9.1.0"
   resolved "https://registry.yarnpkg.com/open/-/open-9.1.0.tgz#684934359c90ad25742f5a26151970ff8c6c80b6"
@@ -9274,6 +9328,27 @@ pascal-case@^3.1.2:
     no-case "^3.0.4"
     tslib "^2.0.3"
 
+patch-package@^8.0.0:
+  version "8.0.0"
+  resolved "https://registry.yarnpkg.com/patch-package/-/patch-package-8.0.0.tgz#d191e2f1b6e06a4624a0116bcb88edd6714ede61"
+  integrity sha512-da8BVIhzjtgScwDJ2TtKsfT5JFWz1hYoBl9rUQ1f38MC2HwnEIkK8VN3dKMKcP7P7bvvgzNDbfNHtx3MsQb5vA==
+  dependencies:
+    "@yarnpkg/lockfile" "^1.1.0"
+    chalk "^4.1.2"
+    ci-info "^3.7.0"
+    cross-spawn "^7.0.3"
+    find-yarn-workspace-root "^2.0.0"
+    fs-extra "^9.0.0"
+    json-stable-stringify "^1.0.2"
+    klaw-sync "^6.0.0"
+    minimist "^1.2.6"
+    open "^7.4.2"
+    rimraf "^2.6.3"
+    semver "^7.5.3"
+    slash "^2.0.0"
+    tmp "^0.0.33"
+    yaml "^2.2.2"
+
 path-case@^3.0.4:
   version "3.0.4"
   resolved "https://registry.yarnpkg.com/path-case/-/path-case-3.0.4.tgz#9168645334eb942658375c56f80b4c0cb5f82c6f"
@@ -10257,6 +10332,13 @@ rfdc@^1.3.0:
   resolved "https://registry.yarnpkg.com/rfdc/-/rfdc-1.3.0.tgz#d0b7c441ab2720d05dc4cf26e01c89631d9da08b"
   integrity sha512-V2hovdzFbOi77/WajaSMXk2OLm+xNIeQdMMuB7icj7bk6zi2F8GGAxigcnDFpJHbNyNcgyJDiP+8nOrY5cZGrA==
 
+rimraf@^2.6.3:
+  version "2.7.1"
+  resolved "https://registry.yarnpkg.com/rimraf/-/rimraf-2.7.1.tgz#35797f13a7fdadc566142c29d4f07ccad483e3ec"
+  integrity sha512-uWjbaKIK3T1OSVptzX7Nl6PvQ3qAGtKEtVRjRuazjfL3Bx5eI409VZSqgND+4UNnmzLVdPj9FqFJNPqBZFve4w==
+  dependencies:
+    glob "^7.1.3"
+
 rimraf@^3.0.0, rimraf@^3.0.2:
   version "3.0.2"
   resolved "https://registry.yarnpkg.com/rimraf/-/rimraf-3.0.2.tgz#f1a5402ba6220ad52cc1282bac1ae3aa49fd061a"
@@ -10495,6 +10577,11 @@ sisteransi@^1.0.5:
   resolved "https://registry.yarnpkg.com/sisteransi/-/sisteransi-1.0.5.tgz#134d681297756437cc05ca01370d3a7a571075ed"
   integrity sha512-bLGGlR1QxBcynn2d5YmDX4MGjlZvy2MRBDRNHLJ8VI6l6+9FUiyTFNJ0IveOSP0bcXgVDPRcfGqA0pjaqUpfVg==
 
+slash@^2.0.0:
+  version "2.0.0"
+  resolved "https://registry.yarnpkg.com/slash/-/slash-2.0.0.tgz#de552851a1759df3a8f206535442f5ec4ddeab44"
+  integrity sha512-ZYKh3Wh2z1PpEXWr0MpSBZ0V6mZHAQfYevttO11c51CaWjGTaadiKZ+wVt1PbMlDV5qhMFslpZCemhwOK7C89A==
+
 slash@^3.0.0:
   version "3.0.0"
   resolved "https://registry.yarnpkg.com/slash/-/slash-3.0.0.tgz#6539be870c165adbd5240220dbe361f1bc4d4634"