fix: avoid exposing t namespace

src/database/check.ts

@@ -6,7 +6,8 @@ import {
 } from './expression'
 import { Query } from './query'
 import { tokenizeCheck, tokenizeExpression } from './tokenize'
-import { Input, isBoolExpression, t, Type } from './type'
+import { Input, isBoolExpression, Type } from './type'
+import { t } from './type-builtin'
 
 interface Props extends ExpressionProps {
   type: 'bool'

src/database/column.ts

@@ -5,7 +5,8 @@ import { Selectable } from './query/select'
 import { kColumnFrom, kColumnName, kPrimaryKey } from './symbols'
 import { RowType, toTableName } from './table'
 import { tokenizeColumn } from './tokenize'
-import { Input, t, Type } from './type'
+import { Input, Type } from './type'
+import { t } from './type-builtin'
 
 export type ColumnOf<T> = string & keyof RowType<T>
 

src/database/expression.ts

@@ -3,12 +3,12 @@ import { kExprProps, kExprTokens } from './symbols'
 import type { TokenProducer } from './token'
 import type {
   SetType,
-  t,
   toDownCasts,
   toRuntimeType,
   toTypeName,
   Type,
 } from './type'
+import { t } from './type-builtin'
 
 /**
  * This list is non-exhaustive. \

src/database/is.ts

@@ -1,6 +1,7 @@
 import { CheckBuilder, CheckList } from './check'
 import { BoolExpression, Expression } from './expression'
-import { isBoolExpression, t, Type } from './type'
+import { isBoolExpression, Type } from './type'
+import { t } from './type-builtin'
 
 export function is(left: BoolExpression): CheckList<t.bool>
 export function is(

src/database/query/where.ts

@@ -9,7 +9,8 @@ import { Selection } from '../selection'
 import { getSetAlias, SetRef } from '../set'
 import { kPrimaryKey, kTableName } from '../symbols'
 import { PrimaryKeyOf, RowType, TableRef, toTableRef } from '../table'
-import { t, Type } from '../type'
+import { Type } from '../type'
+import { t } from '../type-builtin'
 import { Selectable } from './select'
 
 export function where<From extends Selectable[]>(

src/database/type-builtin.d.ts

@@ -0,0 +1,8 @@
+import type { Type } from './type'
+
+export declare namespace t {
+  export type bool = Type<'bool', boolean>
+
+  type NULL = Type<'null', undefined>
+  export { NULL as null }
+}

src/database/type.ts

@@ -3,9 +3,6 @@ import type { BoolExpression, Expression, SetExpression } from './expression'
 import type { Selection } from './selection'
 import { kColumnFrom, kExprProps, kSelectionFrom, kTableName } from './symbols'
 import type { TableRef } from './table'
-import * as t from './type-builtin'
-
-export type { t }
 
 const kTypeName = Symbol()
 const kRuntimeType = Symbol()