Ensure only types are imported

Author: KallynGowdy

lib/function.ts

@@ -1,8 +1,8 @@
-import { NullTreatment } from "./data-type";
+import type { NullTreatment } from "./data-type";
 import type { Expr } from "./expr";
 import type { Ident, ObjectName } from "./ident";
-import { OrderByExpr, Query } from "./statement";
-import { Value } from "./token";
+import type { OrderByExpr, Query } from "./statement";
+import type { Value } from "./token";
 
 /**
  * A function call

lib/statement.ts

@@ -1,6 +1,6 @@
-import { ColumnDef, ColumnOption, CommentDef, ConstraintCharacteristics, DataType, GeneratedAs, NullsDistinctOption, ReferentialAction, SequenceOptions, SqlOption } from "./data-type";
+import type { ColumnDef, ColumnOption, CommentDef, ConstraintCharacteristics, DataType, GeneratedAs, NullsDistinctOption, ReferentialAction, SequenceOptions, SqlOption } from "./data-type";
 import type { Expr, ExprWithAlias, OneOrManyWithParens } from "./expr";
-import { FunctionArg, NamedWindowDefinition, SQLFunction } from "./function";
+import type { FunctionArg, NamedWindowDefinition, SQLFunction } from "./function";
 import type { Ident, ObjectName, ObjectType } from "./ident";
 import type { AttachedToken, Value, ValueWithSpan } from "./token";
 

lib/token.ts

@@ -1,4 +1,4 @@
-import { DataType } from "./data-type";
+import type { DataType } from "./data-type";
 import type { Keyword } from "./keyword";
 import type { Span } from "./span";