@ai-sdk/provider-utils/src/to-json-schema/zod3-to-json-schema/parsers/never.ts

import { parseAnyDef, type JsonSchema7AnyType } from './any';

export type JsonSchema7NeverType = {
  not: JsonSchema7AnyType;
};

export function parseNeverDef(): JsonSchema7NeverType | undefined {
  return { not: parseAnyDef() };
}