refactor(drizzle): declare query variance (#40891)

packages/effect-drizzle-sqlite/src/sqlite-core/effect/select.ts

@@ -44,11 +44,12 @@ export type SQLiteEffectSelectPrepare<
   TEffectHKT
 >
 
+// Explicit variance prevents comparisons from recursively scanning Drizzle's conditional select types.
 export class SQLiteEffectSelectBuilder<
-  TSelection extends SelectedFields | undefined,
-  TRunResult,
-  TEffectHKT extends QueryEffectHKTBase = QueryEffectHKTBase,
-  TBuilderMode extends "db" | "qb" = "db",
+  out TSelection extends SelectedFields | undefined,
+  out TRunResult,
+  out TEffectHKT extends QueryEffectHKTBase = QueryEffectHKTBase,
+  out TBuilderMode extends "db" | "qb" = "db",
 > {
   static readonly [entityKind]: string = "SQLiteEffectSelectBuilder"
 

packages/effect-drizzle-sqlite/src/sqlite-core/effect/session.ts

@@ -303,10 +303,11 @@ export class SQLiteEffectPreparedQuery<
   }
 }
 
+// Explicit variance prevents comparisons from recursively scanning the full Drizzle query-builder graph.
 export abstract class SQLiteEffectSession<
-  TEffectHKT extends QueryEffectHKTBase = QueryEffectHKTBase,
-  TRunResult = unknown,
-  TRelations extends AnyRelations = EmptyRelations,
+  out TEffectHKT extends QueryEffectHKTBase = QueryEffectHKTBase,
+  out TRunResult = unknown,
+  out TRelations extends AnyRelations = EmptyRelations,
 > {
   static readonly [entityKind]: string = "SQLiteEffectSession"
 
@@ -404,9 +405,9 @@ export abstract class SQLiteEffectSession<
 }
 
 export abstract class SQLiteEffectTransaction<
-  TEffectHKT extends QueryEffectHKTBase,
-  TRunResult,
-  TRelations extends AnyRelations = EmptyRelations,
+  out TEffectHKT extends QueryEffectHKTBase,
+  out TRunResult,
+  out TRelations extends AnyRelations = EmptyRelations,
 > extends SQLiteEffectDatabase<TEffectHKT, TRunResult, TRelations> {
   static override readonly [entityKind]: string = "SQLiteEffectTransaction"