add type test file stub for generic stuff

Author: koskimas

test/typings/test-d/generic.test-d.ts

@@ -0,0 +1,107 @@
+import { Kysely, ExpressionBuilder, SelectQueryBuilder, Generated } from '..'
+
+import { expectAssignable, expectType } from 'tsd'
+import { Database } from '../shared'
+
+// TODO: type-checking this is crazy slow. Figure out the cause.
+function testSelectQueryBuilderExtends() {
+  type A = { a: number }
+  type B = { b: string }
+
+  type T1 = SelectQueryBuilder<{ a: A }, 'a', unknown>
+
+  // This type extends T1 and should be assignable to it.
+  type T2 = SelectQueryBuilder<{ a: A; b: B }, 'a' | 'b', { a: number }>
+
+  const t2 = {} as T2
+  expectAssignable<T1>(t2)
+}
+
+// TODO: type-checking this is crazy slow. Figure out the cause.
+function testExpressionBuilderExtends() {
+  type A = { a: number }
+  type B = { b: string }
+
+  type T1 = ExpressionBuilder<{ a: A }, 'a'>
+
+  // This type extends T1 and should be assignable to it.
+  type T2 = ExpressionBuilder<{ a: A; b: B }, 'a' | 'b'>
+
+  const t2 = {} as T2
+  expectAssignable<T1>(t2)
+}
+
+// TODO: type-checking this is crazy slow. Figure out the cause.
+function testExpressionBuilderExtendsFuncArg() {
+  type A = { a: number }
+  type B = { b: string }
+  type C = { c: boolean }
+
+  // This type extends T1 and should be assignable to it.
+  type T2 = ExpressionBuilder<{ a: A; b: B; c: C }, 'a' | 'b' | 'c'>
+
+  function test(eb: ExpressionBuilder<{ a: A; b: B; c: C }, 'b' | 'c'>) {
+    console.log(eb)
+  }
+
+  const t2 = {} as T2
+  test(t2)
+}
+
+// TODO: type-checking this is crazy slow. Figure out the cause.
+async function testGenericSelectHelper() {
+  type Parent = { id: Generated<string> }
+  type Person = { id: Generated<string>; parent_id: string }
+  type Pet = { owner_id: string; name: string }
+  const db: Kysely<{ person: Person; parent: Parent; pet: Pet }> = undefined!
+
+  function personPetSelect(
+    eb: ExpressionBuilder<
+      {
+        parent: { id: string | null }
+        petJoin: { name: string | null }
+      },
+      'parent' | 'petJoin'
+    >
+  ) {
+    return ['parent.id'] as const
+  }
+
+  const result = await db
+    .selectFrom('parent')
+    .leftJoin('person as personJoin', 'personJoin.parent_id', 'parent.id')
+    .leftJoin('pet as petJoin', 'petJoin.owner_id', 'personJoin.id')
+    .select(personPetSelect)
+    .execute()
+}
+
+async function testGenericSelect<T extends keyof Database>(
+  db: Kysely<Database>,
+  table: T
+) {
+  const r1 = await db.selectFrom(table).select('id').executeTakeFirstOrThrow()
+  expectAssignable<string | number>(r1.id)
+}
+
+async function testGenericUpdate(db: Kysely<Database>, table: 'pet' | 'movie') {
+  await db.updateTable(table).set({ id: '123' }).execute()
+}
+
+async function testSelectsInVariable(db: Kysely<Database>) {
+  const selects = [
+    'first_name',
+    (eb: ExpressionBuilder<Database, 'person'>) =>
+      eb
+        .selectFrom('pet')
+        .select('name')
+        .whereRef('pet.owner_id', '=', 'person.id')
+        .as('pet_name'),
+  ] as const
+
+  const r1 = await db
+    .selectFrom('person')
+    .select(selects)
+    .executeTakeFirstOrThrow()
+
+  expectType<{ first_name: string; pet_name: string | null }>(r1)
+}

test/typings/test-d/index.test-d.ts

@@ -351,37 +351,6 @@ async function testCall(db: Kysely<Database>) {
   expectType<{ species: 'dog' | 'cat'; name: string }>(r1)
 }
 
-async function testGenericSelect<T extends keyof Database>(
-  db: Kysely<Database>,
-  table: T
-) {
-  const r1 = await db.selectFrom(table).select('id').executeTakeFirstOrThrow()
-  expectAssignable<string | number>(r1.id)
-}
-
-async function testGenericUpdate(db: Kysely<Database>, table: 'pet' | 'movie') {
-  await db.updateTable(table).set({ id: '123' }).execute()
-}
-
-async function testSelectsInVariable(db: Kysely<Database>) {
-  const selects = [
-    'first_name',
-    (eb: ExpressionBuilder<Database, 'person'>) =>
-      eb
-        .selectFrom('pet')
-        .select('name')
-        .whereRef('pet.owner_id', '=', 'person.id')
-        .as('pet_name'),
-  ] as const
-
-  const r1 = await db
-    .selectFrom('person')
-    .select(selects)
-    .executeTakeFirstOrThrow()
-
-  expectType<{ first_name: string; pet_name: string | null }>(r1)
-}
-
 async function testUntypedKysely(db: Kysely<any>) {
   // Kysely instance with `any` DB type still extracts column names.
   const r1 = await db