Initial FDC resolver support in functions SDK.

[rosalyntan]

Description

Code sample

[gemini-code-assist]

Summary of Changes

Hello @rosalyntan, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request introduces foundational support for Firebase Data Connect (FDC) resolvers within the Firebase Functions SDK. It provides a new entry point, onGraphRequest, for developers to easily set up and deploy GraphQL servers as HTTPS functions. By integrating with Apollo Server, this change offers a structured way to define GraphQL schemas and resolvers, streamlining the development of GraphQL-based APIs on Firebase.

Highlights

• FDC Resolver Support: Introduced initial support for Firebase Data Connect (FDC) resolvers within the functions SDK, enabling the creation of GraphQL APIs.
• GraphQL Server Function: Added a new onGraphRequest function that allows developers to define and deploy GraphQL servers as HTTPS functions.
• Apollo Server Integration: Integrated ApolloServer and @as-integrations/express4 to provide robust GraphQL server capabilities, including schema definition and resolver mapping.
• Dependency Updates: Updated package.json and package-lock.json to include @apollo/server and @as-integrations/express4 as optional peer dependencies, along with their transitive dependencies.

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[gemini-code-assist]

Code Review

This pull request introduces initial support for Firebase Data Connect (FDC) resolvers via a new onGraphRequest function. This allows developers to create GraphQL endpoints. My review focuses on the implementation of onGraphRequest and its associated options. I've identified a critical issue with how optional dependencies are handled, which will cause runtime errors. I've also found some bugs related to handling server options, such as ignoring the customizable path and schema file path. Additionally, there are some areas for improvement in the options interface and a hardcoded value that needs clarification.