Example for https://github.com/philsch/graphql-error-tracking-extension/issues/6

server.js

const { ApolloServer, gql } = require('apollo-server');
const {GraphQLErrorTrackingExtension} = require('graphql-error-tracking-extension');
const {ErrorReporting} = require('@google-cloud/error-reporting');
const errorReporting = new ErrorReporting();

/*
 * ----------------------------------------
 * Let's define some custom errors
 * ----------------------------------------
 */
class SomeError extends Error {
    constructor(msg) {
        super(msg);
        this.name = 'Some Error';
    }
}
class SecretError extends Error {
    constructor(msg) {
        super(msg);
        this.name = 'Secret Error';
    }
}

/*
 * ----------------------------------------
 * The GraphQL Server
 * ----------------------------------------
 */
const typeDefs = gql`
  type Query {
    #
    # Some example endpoint to trigger Errors
    #
    triggerError(errorType: String): String
  }
`;
const resolvers = {
    Query: {
        triggerError: (parent, args, context, info) => {
            switch (args.errorType) {
                case 'some':
                    throw new SomeError('Some error happened');
                case 'secret':
                    throw new SecretError('A secret error');
                default:
                    throw Error('Unknown error');
            }
        }
    }
}

const server = new ApolloServer({
    typeDefs,
    resolvers,
    extensions: [() => new GraphQLErrorTrackingExtension({
        revealErrorTypes: [SomeError],
        onUnrevealedError: (err, originalError) => {
            console.log(`onUnrevealedError called for ${err.name} (original error was "${err.originalError.name}")`);
            if (originalError) {
                errorReporting.report(err.originalError.stack);
            } else {
                errorReporting.report(err.stack);
            }
        }
    })],
    context: ({req}) => ({
        request: req
    })
});

server.listen({port: 8080}).then(({ url }) => {
    console.log(`🚀  Server ready at ${url}`);
});