feat: add request deduplication demo to Express example

[ayushvyas-dev]

Summary

• Add a /dedup-demo endpoint to the Express example
• Enable SmoothAPI request deduplication
• Make three identical requests concurrently using Promise.all()
• Return the results to the client
• Document the new endpoint in the Express example README

Testing

• npm run build
• npm test
• Manually tested /dedup-demo
• Verified that three concurrent identical requests result in a single underlying sandbox request

Closes #29

Summary by CodeRabbit

• New Features

  • Added an Express example endpoint demonstrating request deduplication with concurrent identical health requests.
  • The endpoint returns the parsed results from all concurrent requests.

• Documentation

  • Updated the Express example documentation with request deduplication details and a curl example for the new endpoint.

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[coderabbitai]

📝 Walkthrough

Walkthrough

The Express example now enables SmoothAPI request deduplication, adds a /dedup-demo endpoint with three concurrent identical health requests, and documents the endpoint with a curl example.

Changes

Express request deduplication

Layer / File(s)	Summary
Deduplicating client setup examples/express/server.ts	The server creates a SmoothAPI fetch client with deduplication enabled. The root endpoint lists the feature and /dedup-demo.
Concurrent demo route and documentation examples/express/server.ts, examples/express/README.md	The new route sends three identical requests with Promise.all(), returns parsed results, and maps failures to HTTP 502. The README documents the route and adds a curl example.

Estimated code review effort: 2 (Simple) | ~10 minutes

Merge Risk: 🟡 Moderate · up to 69b9c

The new endpoint currently fails strict TypeScript compilation because the deduplicated responses are inferred as unknown before json() is called. The PR is not merge-ready until the client is explicitly typed as Response or otherwise corrected.

Sequence Diagram(s)

sequenceDiagram
  participant Client
  participant Express
  participant dedupSmoothFetch
  participant SandboxHealth
  Client->>Express: GET /dedup-demo
  Express->>dedupSmoothFetch: Start three identical /health requests
  dedupSmoothFetch->>SandboxHealth: Request /health
  SandboxHealth-->>dedupSmoothFetch: Health response
  dedupSmoothFetch-->>Express: Three parsed results
  Express-->>Client: Results or HTTP 502

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🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly and concisely identifies the main change: adding a request deduplication demo to the Express example.
Linked Issues check	✅ Passed	The changes satisfy issue #29. They add /dedup-demo, enable request deduplication, make three identical concurrent requests with Promise.all(), return the parsed results, and document the example …
Out of Scope Changes check	✅ Passed	All changes are within scope. The implementation and README updates directly support the request deduplication demo objective.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check. Docstring coverage is scoped to functions touched by this diff. Analyzed 0 functions across 1…

Full details: Linked Issues check

Explanation

The changes satisfy issue #29. They add /dedup-demo, enable request deduplication, make three identical concurrent requests with Promise.all(), return the parsed results, and document the example without changing existing routes.

Full details: Docstring Coverage

Explanation

No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check. Docstring coverage is scoped to functions touched by this diff. Analyzed 0 functions across 1 files. (1 skipped: 1 unsupported.)

✨ Finishing Touches 💡 1

🛠️ Fix failing CI checks 💡

• Create stacked PR
• Commit on current branch

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Actionable comments posted: 1

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Inline comments:
In `@examples/express/server.ts`:
- Around line 48-50: Update the createSmoothFetch call assigned to
dedupSmoothFetch to explicitly use Response as its generic type, preserving the
existing deduplication configuration so subsequent response .json() calls remain
type-safe.

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Fix all unresolved CodeRabbit comments on this PR:

• Push a commit to this branch (recommended)
• Create a new PR with the fixes

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ℹ️ Review info

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📥 Commits

Reviewing files that changed from the base of the PR and between 8c572f4 and 69b9cf6.

📒 Files selected for processing (2)

• examples/express/README.md
• examples/express/server.ts

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[AryanSharma48]

LGTM, thanks for the contribution @ayushvyas-dev