How to use the apollo-language-server.ToolError function in apollo-language-server

export function loadSchema(schemaPath: string): GraphQLSchema {
  if (!fs.existsSync(schemaPath)) {
    throw new ToolError(`Cannot find GraphQL schema file: ${schemaPath}`);
  }
  const schemaData = require(schemaPath);

  if (!schemaData.data && !schemaData.__schema) {
    throw new ToolError(
      "GraphQL schema file should contain a valid GraphQL introspection query result"
    );
  }
  return buildClientSchema(schemaData.data ? schemaData.data : schemaData);
}

export function loadSchema(schemaPath: string): GraphQLSchema {
  if (!fs.existsSync(schemaPath)) {
    throw new ToolError(`Cannot find GraphQL schema file: ${schemaPath}`);
  }
  const schemaData = require(schemaPath);

  if (!schemaData.data && !schemaData.__schema) {
    throw new ToolError(
      "GraphQL schema file should contain a valid GraphQL introspection query result"
    );
  }
  return buildClientSchema(schemaData.data ? schemaData.data : schemaData);
}