fix(types): allow merge Record and litteral object

src/types.ts

@@ -131,24 +131,31 @@ export type CheckMatchingArrayTypes<Result, NewResult> =
 
 type Simplify<T> = T extends object ? { [K in keyof T]: T[K] } : T
 
-type MergeDeep<New, Row> = {
-  [K in keyof New | keyof Row]: K extends keyof New
+// Extract only explicit (non-index-signature) keys.
+type ExplicitKeys<T> = {
+  [K in keyof T]: string extends K ? never : K
+}[keyof T]
+
+type MergeExplicit<New, Row> = {
+  // We merge all the explicit keys which allows merge and override of types like
+  // { [key: string]: unknown } and { someSpecificKey: boolean }
+  [K in ExplicitKeys<New> | ExplicitKeys<Row>]: K extends keyof New
     ? K extends keyof Row
       ? Row[K] extends SelectQueryError<string>
         ? New[K]
-        : // Check if the override is on a embeded relation (array)
+        : // Check if the override is on a embedded relation (array)
         New[K] extends any[]
         ? Row[K] extends any[]
           ? Array<Simplify<MergeDeep<NonNullable<New[K][number]>, NonNullable<Row[K][number]>>>>
           : New[K]
-        : // Check if both properties are objects omiting a potential null union
+        : // Check if both properties are objects omitting a potential null union
         IsPlainObject<NonNullable<New[K]>> extends true
         ? IsPlainObject<NonNullable<Row[K]>> extends true
           ? // If they are, use the new override as source of truth for the optionality
             ContainsNull<New[K]> extends true
-            ? // If the override want to preserve optionality
+            ? // If the override wants to preserve optionality
               Simplify<MergeDeep<NonNullable<New[K]>, NonNullable<Row[K]>>> | null
-            : // If the override want to enforce non-null result
+            : // If the override wants to enforce non-null result
               Simplify<MergeDeep<New[K], NonNullable<Row[K]>>>
           : New[K] // Override with New type if Row isn't an object
         : New[K] // Override primitives with New type
@@ -158,6 +165,15 @@ type MergeDeep<New, Row> = {
     : never
 }
 
+type MergeDeep<New, Row> = Simplify<
+  MergeExplicit<New, Row> &
+    // Intersection here is to restore dynamic keys into the merging result
+    // eg:
+    // {[key: number]: string}
+    // or Record<string, number | null>
+    (string extends keyof Row ? { [K: string]: Row[string] } : {})
+>
+
 // Helper to check if a type is a plain object (not an array)
 type IsPlainObject<T> = T extends any[] ? false : T extends object ? true : false
 

test/override-types.test-d.ts

@@ -247,6 +247,7 @@ const postgrest = new PostgrestClient<Database>(REST_URL)
           bar: { baz: number }
           en: 'ONE' | 'TWO' | 'THREE'
           record: Record<string, Json | undefined> | null
+          recordNumber: Record<number, Json | undefined> | null
           qux: boolean
         }
         age_range: unknown
@@ -277,6 +278,7 @@ const postgrest = new PostgrestClient<Database>(REST_URL)
           bar: { baz: number }
           en: 'ONE' | 'TWO' | 'THREE'
           record: Record<string, Json | undefined> | null
+          recordNumber: Record<number, Json | undefined> | null
           qux: boolean
         } | null
         age_range: unknown
@@ -345,6 +347,7 @@ const postgrest = new PostgrestClient<Database>(REST_URL)
           bar: { baz: number; newBaz: string }
           en: 'FOUR' // Overridden enum value
           record: Record<string, Json | undefined> | null
+          recordNumber: Record<number, Json | undefined> | null
         }
         age_range: unknown
         catchphrase: unknown
@@ -359,7 +362,7 @@ const postgrest = new PostgrestClient<Database>(REST_URL)
   const result = await postgrest
     .from('users')
     .select()
-    .overrideTypes<{ data: { record: { baz: 'foo' } } }[]>()
+    .overrideTypes<{ data: { record: { baz: 'foo' }; recordNumber: { bar: 'foo' } } }[]>()
   if (result.error) {
     throw new Error(result.error.message)
   }
@@ -375,7 +378,14 @@ const postgrest = new PostgrestClient<Database>(REST_URL)
             baz: number
           }
           en: 'ONE' | 'TWO' | 'THREE'
-          record: { baz: 'foo' }
+          record: {
+            [x: string]: Json | undefined
+            baz: 'foo'
+          }
+          recordNumber: {
+            [x: number]: Json | undefined
+            bar: 'foo'
+          }
         }
         age_range: unknown
         catchphrase: unknown

test/types.ts

@@ -7,6 +7,7 @@ export type CustomUserDataType = {
   }
   en: 'ONE' | 'TWO' | 'THREE'
   record: Record<string, Json | undefined> | null
+  recordNumber: Record<number, Json | undefined> | null
 }
 
 export type Database = {