feat: add Relay data fetching with mock GraphQL server

[acald-creator]

Summary

• Add rescript-relay 4.4.1 with PPX for GraphQL queries in ReScript
• Bundle a graphql-yoga mock server at mock-server/ serving User and Post types
• PostsPage fetches posts via a Relay query with React Suspense loading
• App wrapped in RescriptRelayReact.Context.Provider
• Relay compiler generates artifacts to src/__generated__/
• bun run dev now starts ReScript watch + Rspack + mock GraphQL server concurrently

New files

• mock-server/index.js — graphql-yoga with in-memory users/posts data
• mock-server/schema.graphql — GraphQL schema (Query, Mutation, User, Post, Node)
• relay.config.js — Relay compiler config
• src/relay/RelayEnv.res — Relay environment with fetch function
• src/__generated__/ — Relay compiler artifacts

Scripts

• bun run dev:server — start mock GraphQL server on :4000
• bun run relay — run Relay compiler
• bun run relay:watch — watch mode

Test plan

• bun run relay — compiles 1 query successfully
• bun run res:build — 103 modules compiled, zero warnings
• bun run build — production build succeeds
• bun run test — all 18 tests pass

Closes #35

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Project	Deployment	Actions	Updated (UTC)
rspack-rescript	Ready	Preview, Comment	Apr 13, 2026 7:22am

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ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: 431abf41-a42d-4a3b-9fc1-62cfc114d9ac

📥 Commits

Reviewing files that changed from the base of the PR and between 572204d and d9827e2.

⛔ Files ignored due to path filters (3)

• bun.lockb is excluded by !**/bun.lockb
• src/__generated__/PostsPageQuery_graphql.res is excluded by !**/__generated__/**
• src/__generated__/RelaySchemaAssets_graphql.res is excluded by !**/__generated__/**

📒 Files selected for processing (10)

• biome.json
• mock-server/index.js
• mock-server/schema.graphql
• package.json
• relay.config.js
• rescript.json
• rspack.config.js
• src/App.res
• src/pages/PostsPage.res
• src/relay/RelayEnv.res

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch feat/relay-data-fetching

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