express migration plan

This repo becomes the native source of truth for @tsonic/express.

Principles

• Keep host substrate thin.
• Move library behavior into native source.
• Port the current earlier C# baseline tests as the baseline.
• Add broader tests for any current best-effort or simplified behavior.

Initial migration slices

1. Router / route / middleware pipeline
2. Application settings, mount behavior, template engine hooks
3. Request / response shaping that does not depend on host transport internals
4. Built-in middleware and multipart
5. Host substrate adapters (listen, transport request/response, file send)

Current port status

• Started:
  • router
  • route chaining
  • param handling
  • application settings and mount events
  • core response helpers (status, set, send, cookie, render, jsonp)
• Not started:
  • host listen/runtime substrate
  • built-in body parsers
  • static files
  • multipart
  • full request API surface

Existing baseline test sources

• earlier C# baseline/tests/express.Tests/runtime/application.runtime.tests.cs
• earlier C# baseline/tests/express.Tests/runtime/router.runtime.tests.cs
• earlier C# baseline/tests/express.Tests/runtime/params.runtime.tests.cs
• earlier C# baseline/tests/express.Tests/runtime/middleware.runtime.tests.cs
• earlier C# baseline/tests/express.Tests/runtime/request.response.runtime.tests.cs
• earlier C# baseline/tests/express.Tests/runtime/coverage.matrix.*.cs