diff --git a/lib/types.ts b/lib/types.ts
index 42e8339..79d77db 100644
--- a/lib/types.ts
+++ b/lib/types.ts
@@ -34,7 +34,8 @@ export type EnvSchemaPartialValues<S extends BaseEnvSchema> = Partial<
 export type EnvSchemaPropertyValue<
   S extends BaseEnvSchema,
   K extends keyof S['properties'],
-> = K extends keyof TypeFromJSONSchema<S> ? TypeFromJSONSchema<S>[K] : never;
+  V = TypeFromJSONSchema<S>,
+> = K extends keyof V ? V[K] : never;
 
 /**
  * Errors are stored per-property/variable, if something
@@ -119,14 +120,15 @@ export type EnvSchemaCustomSerializers<S extends BaseEnvSchema> = Readonly<
 export type EnvSchemaPostValidateFn<
   S extends BaseEnvSchema,
   K extends keyof S['properties'],
+  V = EnvSchemaPropertyValue<S, K>,
 > = (
-  value: EnvSchemaPropertyValue<S, K> | undefined,
+  value: V | undefined,
   propertySchema: S['properties'][K],
   key: K,
   schema: Readonly<S>,
   allValues: EnvSchemaPartialValues<S>,
   errors: Readonly<EnvSchemaMaybeErrors<S>>,
-) => EnvSchemaPropertyValue<S, K> | undefined;
+) => V | undefined;
 
 /**
  * Customize the validator to be executed for each property,
@@ -149,8 +151,9 @@ export type EnvSchemaConvertFn<
   S extends BaseEnvSchema,
   K extends keyof S['properties'],
   R,
+  V = EnvSchemaPropertyValue<S, K>,
 > = (
-  value: EnvSchemaPropertyValue<S, K> | undefined,
+  value: V | undefined,
   propertySchema: S['properties'][K],
   key: K,
   schema: Readonly<S>,
@@ -193,10 +196,11 @@ type EnvSchemaConvertedValue<
   S extends BaseEnvSchema,
   K extends keyof S['properties'],
   Convert,
+  V = TypeFromJSONSchema<S>,
 > = Convert extends EnvSchemaConvertFn<S, K, infer N>
   ? N
-  : K extends keyof TypeFromJSONSchema<S>
-  ? TypeFromJSONSchema<S>[K]
+  : K extends keyof V
+  ? V[K]
   : never;
 
 type EnvSchemaConvertedValuesWithConvertInternal<
@@ -219,7 +223,7 @@ export type EnvSchemaConverters<
 
 export type EnvSchemaConvertedPartialValuesWithConvert<
   S extends BaseEnvSchema,
-  Converters extends EnvSchemaCustomConverters<S> | undefined,
+  Converters,
 > = Converters extends EnvSchemaCustomConverters<S>
   ? Partial<EnvSchemaConvertedValuesWithConvertInternal<S, Converters>>
   : EnvSchemaPartialValues<S>;
@@ -238,7 +242,7 @@ export type EnvSchemaConvertedPartialValues<
 
 export type EnvSchemaConvertedValuesWithConvert<
   S extends BaseEnvSchema,
-  Converters extends EnvSchemaCustomConverters<S> | undefined,
+  Converters,
 > = Converters extends EnvSchemaCustomConverters<S>
   ? EnvSchemaConvertedValuesWithConvertInternal<S, Converters>
   : TypeFromJSONSchema<S>;
diff --git a/package.json b/package.json
index 08b8109..28ee0fe 100644
--- a/package.json
+++ b/package.json
@@ -42,6 +42,7 @@
     "husky": "^8.0.3",
     "install-peers-cli": "^2.2.0",
     "jest": "^29.5.0",
+    "json-schema-to-ts": "^2.8.0",
     "lint-staged": "^13.2.2",
     "npm-run-all": "^4.1.5",
     "prettier": "^2.8.8",
diff --git a/yarn.lock b/yarn.lock
index 5245bb7..0756cd3 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -105,7 +105,7 @@
     "@babel/traverse" "^7.21.5"
     "@babel/types" "^7.21.5"
 
-"@babel/helper-plugin-utils@^7.0.0", "@babel/helper-plugin-utils@^7.10.4", "@babel/helper-plugin-utils@^7.12.13", "@babel/helper-plugin-utils@^7.14.5", "@babel/helper-plugin-utils@^7.20.2", "@babel/helper-plugin-utils@^7.8.0":
+"@babel/helper-plugin-utils@^7.0.0", "@babel/helper-plugin-utils@^7.10.4", "@babel/helper-plugin-utils@^7.12.13", "@babel/helper-plugin-utils@^7.20.2", "@babel/helper-plugin-utils@^7.8.0":
   version "7.21.5"
   resolved "https://registry.yarnpkg.com/@babel/helper-plugin-utils/-/helper-plugin-utils-7.21.5.tgz#345f2377d05a720a4e5ecfa39cbf4474a4daed56"
   integrity sha512-0WDaIlXKOX/3KfBK/dwP1oQGiPh6rjMkT7HIRv7i5RR2VUMwrx5ZL0dwBkKx7+SW1zwNdgjHd34IMk5ZjTeHVg==
@@ -157,7 +157,7 @@
     chalk "^2.0.0"
     js-tokens "^4.0.0"
 
-"@babel/parser@^7.1.0", "@babel/parser@^7.14.7", "@babel/parser@^7.20.7", "@babel/parser@^7.21.5", "@babel/parser@^7.21.8":
+"@babel/parser@^7.1.0", "@babel/parser@^7.12.13", "@babel/parser@^7.14.7", "@babel/parser@^7.20.7", "@babel/parser@^7.21.5", "@babel/parser@^7.21.8":
   version "7.21.8"
   resolved "https://registry.yarnpkg.com/@babel/parser/-/parser-7.21.8.tgz#642af7d0333eab9c0ad70b14ac5e76dbde7bfdf8"
   integrity sha512-6zavDGdzG3gUqAdWvlLFfk+36RilI+Pwyuuh7HItyeScCWP3k6i8vKclAQ0bM/0y/Kz/xiwvxhMv9MgTJP5gmA==
@@ -247,11 +247,11 @@
     "@babel/helper-plugin-utils" "^7.8.0"
 
 "@babel/plugin-syntax-top-level-await@^7.8.3":
-  version "7.14.5"
-  resolved "https://registry.yarnpkg.com/@babel/plugin-syntax-top-level-await/-/plugin-syntax-top-level-await-7.14.5.tgz#c1cfdadc35a646240001f06138247b741c34d94c"
-  integrity sha512-hx++upLv5U1rgYfwe1xBQUhRmU41NEvpUvrp8jkrSCdvGSnM5/qdRMtylJ6PG5OFkBaHkbTAKTnd3/YyESRHFw==
+  version "7.12.13"
+  resolved "https://registry.yarnpkg.com/@babel/plugin-syntax-top-level-await/-/plugin-syntax-top-level-await-7.12.13.tgz#c5f0fa6e249f5b739727f923540cf7a806130178"
+  integrity sha512-A81F9pDwyS7yM//KwbCSDqy3Uj4NMIurtplxphWxoYtNPov7cJsDkAFNNyVlIZ3jwGycVsurZ+LtOA8gZ376iQ==
   dependencies:
-    "@babel/helper-plugin-utils" "^7.14.5"
+    "@babel/helper-plugin-utils" "^7.12.13"
 
 "@babel/plugin-syntax-typescript@^7.7.2":
   version "7.21.4"
@@ -260,7 +260,14 @@
   dependencies:
     "@babel/helper-plugin-utils" "^7.20.2"
 
-"@babel/template@^7.20.7", "@babel/template@^7.3.3":
+"@babel/runtime@^7.18.3":
+  version "7.21.5"
+  resolved "https://registry.yarnpkg.com/@babel/runtime/-/runtime-7.21.5.tgz#8492dddda9644ae3bda3b45eabe87382caee7200"
+  integrity sha512-8jI69toZqqcsnqGGqwGS4Qb1VwLOEp4hz+CXPywcvjs60u3B4Pom/U/7rm4W8tMOYEB+E9wgD0mW1l3r8qlI9Q==
+  dependencies:
+    regenerator-runtime "^0.13.11"
+
+"@babel/template@^7.20.7":
   version "7.20.7"
   resolved "https://registry.yarnpkg.com/@babel/template/-/template-7.20.7.tgz#a15090c2839a83b02aa996c0b4994005841fd5a8"
   integrity sha512-8SegXApWe6VoNw0r9JHpSteLKTpTiLZ4rMlGIm9JQ18KiCtyQiAMEazujAHrUS5flrcqYZa75ukev3P6QmUwUw==
@@ -269,6 +276,15 @@
     "@babel/parser" "^7.20.7"
     "@babel/types" "^7.20.7"
 
+"@babel/template@^7.3.3":
+  version "7.12.13"
+  resolved "https://registry.yarnpkg.com/@babel/template/-/template-7.12.13.tgz#530265be8a2589dbb37523844c5bcb55947fb327"
+  integrity sha512-/7xxiGA57xMo/P2GVvdEumr8ONhFOhfgq2ihK3h1e6THqzTAkHbkXgB0xI9yeTfIUoH3+oAeHhqm/I43OTbbjA==
+  dependencies:
+    "@babel/code-frame" "^7.12.13"
+    "@babel/parser" "^7.12.13"
+    "@babel/types" "^7.12.13"
+
 "@babel/traverse@^7.21.5", "@babel/traverse@^7.7.2":
   version "7.21.5"
   resolved "https://registry.yarnpkg.com/@babel/traverse/-/traverse-7.21.5.tgz#ad22361d352a5154b498299d523cf72998a4b133"
@@ -285,7 +301,7 @@
     debug "^4.1.0"
     globals "^11.1.0"
 
-"@babel/types@^7.0.0", "@babel/types@^7.18.6", "@babel/types@^7.20.7", "@babel/types@^7.21.0", "@babel/types@^7.21.4", "@babel/types@^7.21.5", "@babel/types@^7.3.0", "@babel/types@^7.3.3":
+"@babel/types@^7.0.0", "@babel/types@^7.12.13", "@babel/types@^7.18.6", "@babel/types@^7.20.7", "@babel/types@^7.21.0", "@babel/types@^7.21.4", "@babel/types@^7.21.5", "@babel/types@^7.3.0", "@babel/types@^7.3.3":
   version "7.21.5"
   resolved "https://registry.yarnpkg.com/@babel/types/-/types-7.21.5.tgz#18dfbd47c39d3904d5db3d3dc2cc80bedb60e5b6"
   integrity sha512-m4AfNvVF2mVC/F7fDEdH2El3HzUg9It/XsCxZiOTTA3m3qYfcSVSbTfM6Q9xG+hYDniZssYhlXKKUMD5m8tF4Q==
@@ -3183,6 +3199,15 @@ json-parse-even-better-errors@^2.3.0:
   resolved "https://registry.yarnpkg.com/json-parse-even-better-errors/-/json-parse-even-better-errors-2.3.1.tgz#7c47805a94319928e05777405dc12e1f7a4ee02d"
   integrity sha512-xyFwyhro/JEof6Ghe2iz2NcXoj2sloNsWr/XsERDK/oiPCfaNhl5ONfp+jQdAZRQQ0IJWNzH9zIZF7li91kh2w==
 
+json-schema-to-ts@^2.8.0:
+  version "2.8.0"
+  resolved "https://registry.yarnpkg.com/json-schema-to-ts/-/json-schema-to-ts-2.8.0.tgz#4e31a6ac98fd7ceae2a7ad065fa73977f0588ddb"
+  integrity sha512-fNAnQ6N0a/0rJlqkzKBdb+5EnMgcKTlrAwMLg3adlKRTT1uNNT4ziqwBzMhj4vp768pO9PoQzZcUyv3QWmD0pQ==
+  dependencies:
+    "@babel/runtime" "^7.18.3"
+    "@types/json-schema" "^7.0.9"
+    ts-algebra "^1.2.0"
+
 json-schema-traverse@^0.4.1:
   version "0.4.1"
   resolved "https://registry.yarnpkg.com/json-schema-traverse/-/json-schema-traverse-0.4.1.tgz#69f6a87d9513ab8bb8fe63bdb0979c448e684660"
@@ -3933,6 +3958,11 @@ redent@^3.0.0:
     indent-string "^4.0.0"
     strip-indent "^3.0.0"
 
+regenerator-runtime@^0.13.11:
+  version "0.13.11"
+  resolved "https://registry.yarnpkg.com/regenerator-runtime/-/regenerator-runtime-0.13.11.tgz#f6dca3e7ceec20590d07ada785636a90cdca17f9"
+  integrity sha512-kY1AZVr2Ra+t+piVaJ4gxaFaReZVH40AKNo7UCX6W+dEwBo/2oZJzqfuN1qLq1oL45o56cPaTXELwrTh8Fpggg==
+
 regexp.prototype.flags@^1.4.3:
   version "1.5.0"
   resolved "https://registry.yarnpkg.com/regexp.prototype.flags/-/regexp.prototype.flags-1.5.0.tgz#fe7ce25e7e4cca8db37b6634c8a2c7009199b9cb"
@@ -4426,6 +4456,11 @@ trim-newlines@^3.0.0:
   resolved "https://registry.yarnpkg.com/trim-newlines/-/trim-newlines-3.0.1.tgz#260a5d962d8b752425b32f3a7db0dcacd176c144"
   integrity sha512-c1PTsA3tYrIsLGkJkzHF+w9F2EyxfXGo4UyJc4pFL++FMjnq0HJS69T3M7d//gKrFKwy429bouPescbjecU+Zw==
 
+ts-algebra@^1.2.0:
+  version "1.2.0"
+  resolved "https://registry.yarnpkg.com/ts-algebra/-/ts-algebra-1.2.0.tgz#f91c481207a770f0d14d055c376cbee040afdfc9"
+  integrity sha512-kMuJJd8B2N/swCvIvn1hIFcIOrLGbWl9m/J6O3kHx9VRaevh00nvgjPiEGaRee7DRaAczMYR2uwWvXU22VFltw==
+
 ts-jest@^29.1.0:
   version "29.1.0"
   resolved "https://registry.yarnpkg.com/ts-jest/-/ts-jest-29.1.0.tgz#4a9db4104a49b76d2b368ea775b6c9535c603891"