Apollo Utilities

We use this repository as a place to keep code we use across our apollo implementing services' repositories. These include plugins, dataloader functions, etc.

Development

1. npm install
2. npm run test run tests or npm run test:watch to watch files and run tests when the code changes.
3. Be sure to export any new modules in src/index.ts

Dependency

1. Update the apollo server version to 3 and node version to 16 to import this package.

Example Usage

Sentry Plugin and Error Handler

• Setting up plugin and error handler with the apollo server

const server = new ApolloServer({
  schema: buildFederatedSchema({ typeDefs, resolvers }),
  plugins: [sentryPlugin],
  formatError: errorHandler,
});

• Throwing custom error

throw new NotFoundError('book id');

• Throwing Apollo errors

import { UserInputError } from 'apollo-server-errors';

throw new UserInputError('Invalid User Input');

ISOString Scalar

This gives you a ISOString Scalar that expects a valid TypeScript Date object or null (to represent no date && cases like 0000-00-00) on the serverside, and an ISO-8601-compliant Datetime string or an empty string when interacting with clients.

The expectation of this custom scalar is that the database client layer will handle mapping valid Dates to a Typescript Date Object and invalid Dates to either null (e.g. should be considered a None type) or throw some internal error.

This custom scalar expects UTC, ISO-8601-compliant datetime string values as input only. Inputs must specify UTC and must follow ISO-8601.

In your graphql schema file:

"""
ISOString scalar - all datetimes fields are Typescript Date objects on this server &
returned as ISO-8601 encoded date strings (e.g. ISOString scalars) to GraphQL clients.
See Section 5.6 of the RFC 3339 profile of the ISO 8601 standard: https://www.ietf.org/rfc/rfc3339.txt.
"""
scalar ISOString

type Something {
  """
  Timestamp that the Something entity was created.
  """
  createdAt: ISOString

  """
  Timestamp that the Something entity was deleted, null if not deleted.
  """
  deletedAt: ISOString
}

In your types file (if not autogenerated), anything that is an ISOString is either Date or Date | null (if the field is optional):

export type Something = {
  createdAt: Date;
  deletedAt: Date | null;

In your resolvers file(s):

import { PocketDefaultScalars } from '@pocket-tools/apollo-utils';

const resolvers = {
  ...PocketDefaultScalars,
  // ...other resolvers...
  // if another server needs a different internal representation
  // they can still override the defaults below:
  // ISOString: someNonDefaultScalar
};

& make sure the server typeDefs points back to the schema.graphql file already update (in order to know about the ISOString type).