graphql-query-test-mock/lib/getOperationNameFromQuery.js.flow

Mock queries to your GraphQL backend in your Jest tests.

// @flow strict
import { parse } from 'graphql/language/parser';

export function getOperationNameFromQuery(query: string): string {
  try {
    const { definitions } = parse(query);
    const definition =
      definitions.length > 0
        ? definitions.find(({ kind }) => kind === 'OperationDefinition')
        : null;

    const operationName =
      definition && definition.name && definition.name.value
        ? definition.name.value
        : null;

    if (!operationName) {
      throw new Error();
    }

    return String(operationName);
  } catch (e) {
    throw new Error('Could not find query name.');
  }
}