repo_description: A reference implementation of GraphQL for JavaScript
repo_topics: graphql graphql-js
code: import { devAssert } from '../jsutils/devAssert';
  
  import { GraphQLError } from '../error/GraphQLError';
  
  import { assertName } from '../type/assertName';
  
  /* c8 ignore start */
  /**
   * Upholds the spec rules about naming.
   * @deprecated Please use `assertName` instead. Will be removed in v17
   */
  export function assertValidName(name: string): string {
    const error = isValidNameError(name);
    if (error) {
      throw error;
    }
    return name;
  }
  
  /**
   * Returns an Error if a name is invalid.
   * @deprecated Please use `assertName` instead. Will be removed in v17
   */
  export function isValidNameError(name: string): GraphQLError | undefined {
    devAssert(typeof name === 'string', 'Expected name to be a string.');
  
    if (name.startsWith('__')) {
      return new GraphQLError(
        `Name "${name}" must not begin with "__", which is reserved by GraphQL introspection.`,
      );
    }
  
    try {
      assertName(name);
    } catch (error) {
      return error;
    }
  }
  /* c8 ignore stop */
  