feat: flatten variants in case of never

package.json

@@ -91,7 +91,7 @@
     "react-native-web": "0.19.12",
     "react-test-renderer": "18.3.1",
     "release-it": "17.4.0",
-    "typescript": "5.3.3"
+    "typescript": "5.6.3"
   },
   "peerDependencies": {
     "@react-native/normalize-colors": "*",

src/types/breakpoints.ts

@@ -18,26 +18,33 @@ type ExtractBreakpoints<T> = T extends object
             }
     : T
 
-type ParseNestedObject<T> = T extends (...args: infer A) => infer R
-    ? (...args: A) => ParseNestedObject<R>
+type ParseNestedObject<T, ShouldFlatten> = T extends (...args: infer A) => infer R
+    ? (...args: A) => ParseNestedObject<R, false>
     : T extends object
         ? T extends { variants: infer R }
-            ? ParseVariants<FlattenVariants<R>> & ParseNestedObject<Omit<T, 'variants'>>
+            // if intersection of Base and Variants is never, then flatten variants to generic "string"
+            ? (ParseVariants<FlattenVariants<R, false>> & ParseNestedObject<Omit<T, 'variants'>, false>) extends never
+                ? ParseVariants<FlattenVariants<R, true>> & ParseNestedObject<Omit<T, 'variants'>, false>
+                : ParseVariants<FlattenVariants<R, false>> & ParseNestedObject<Omit<T, 'variants'>, false>
             : {
                 [K in keyof T]: T[K] extends object
                     ? T[K] extends OpaqueColorValue
                         ? ColorValue
                         : ExtractBreakpoints<T[K]>
-                    : T[K]
+                    : T[K] extends string
+                        ? ShouldFlatten extends true
+                            ? string
+                            : T[K]
+                        : T[K]
             }
         : T
 
-type FlattenVariants<T> = T extends object
+type FlattenVariants<T, ShouldFlatten> = T extends object
     ? {
         [K in keyof T]: T[K] extends object
             ? {
                 [key in keyof T[K]]: T[K][key] extends object
-                    ? ParseNestedObject<T[K][key]>
+                    ? ParseNestedObject<T[K][key], ShouldFlatten>
                     : never
             }
             : never
@@ -54,7 +61,7 @@ type UnionToIntersection<U> =
     (U extends any ? (k: U) => void : never) extends ((k: infer I) => void) ? I : never
 
 type ParseStyleKeys<T> = T extends object
-    ? { [K in keyof T]: ParseNestedObject<T[K]> }
+    ? { [K in keyof T]: ParseNestedObject<T[K], false> }
     : never
 
 export type ReactNativeStyleSheet<T> = T extends (theme: UnistylesTheme, runtime: UnistylesMiniRuntime) => infer R

yarn.lock

@@ -20883,7 +20883,7 @@ __metadata:
     react-native-web: 0.19.12
     react-test-renderer: 18.3.1
     release-it: 17.4.0
-    typescript: 5.3.3
+    typescript: 5.6.3
   peerDependencies:
     "@react-native/normalize-colors": "*"
     react: "*"
@@ -23868,16 +23868,6 @@ __metadata:
   languageName: node
   linkType: hard
 
-"typescript@npm:5.3.3":
-  version: 5.3.3
-  resolution: "typescript@npm:5.3.3"
-  bin:
-    tsc: bin/tsc
-    tsserver: bin/tsserver
-  checksum: 2007ccb6e51bbbf6fde0a78099efe04dc1c3dfbdff04ca3b6a8bc717991862b39fd6126c0c3ebf2d2d98ac5e960bcaa873826bb2bb241f14277034148f41f6a2
-  languageName: node
-  linkType: hard
-
 "typescript@npm:5.4.5":
   version: 5.4.5
   resolution: "typescript@npm:5.4.5"
@@ -23908,16 +23898,6 @@ __metadata:
   languageName: node
   linkType: hard
 
-"typescript@patch:[email protected]#~builtin<compat/typescript>":
-  version: 5.3.3
-  resolution: "typescript@patch:typescript@npm%3A5.3.3#~builtin<compat/typescript>::version=5.3.3&hash=29ae49"
-  bin:
-    tsc: bin/tsc
-    tsserver: bin/tsserver
-  checksum: f61375590b3162599f0f0d5b8737877ac0a7bc52761dbb585d67e7b8753a3a4c42d9a554c4cc929f591ffcf3a2b0602f65ae3ce74714fd5652623a816862b610
-  languageName: node
-  linkType: hard
-
 "typescript@patch:[email protected]#~builtin<compat/typescript>":
   version: 5.4.5
   resolution: "typescript@patch:typescript@npm%3A5.4.5#~builtin<compat/typescript>::version=5.4.5&hash=29ae49"