Export validation error type

Author: openscript

src/index.tsx

@@ -15,3 +15,4 @@ export { ColumnType, GenericColumnType } from './models/column';
 export { useDSVImport } from './features/context';
 export { Rule } from './models/rule';
 export { Transformer } from './models/transformer';
+export { ValidationError } from './models/validation';