Building Reliable Applications Using React, .NET & Azure
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The document discusses building reliable applications using React, .NET, and Azure, emphasizing the importance of TypeScript, test-driven development, and effective workflows. It covers various topics including hosting options, API types, version control, feature flags, and handling runtime errors. The conclusion reiterates key takeaways, highlighting the necessity of automated client types, data validation, and error tracking in the development process.
Building Reliable Applications Using React, .NET & Azure
- 1. Building Reliable ApplicationsUsing React, .NET &Azure Maurice de Beijer - @mauricedb
- 2. Topics JavaScript versusTypeScript Hosting Test-driven development API types and updates GitWorkflow Feature Flags Runtime errors © ABL - The Problem Solver 2
- 3. Opinions Ahead © ABL - The Problem Solver 3
- 4. Swiss Cheese Model © ABL - The Problem Solver 4
- 5. Maurice de Beijer The Problem Solver Microsoft MVP Freelance lead/developer/instructor Twitter: @mauricedb Web: http://www.TheProblemSolver.nl E-mail: [email protected] 5 © ABL - The Problem Solver
- 6. The React Newsletter © ABL - The Problem Solver 6
- 7. JavaScript versusTypeScript © ABL - The Problem Solver 7
- 8. TypeScript © ABL - The Problem Solver 8
- 9. Language features Type Unions Tuples OptionalChaining Nullish Coalescing operator © ABL - The Problem Solver 9
- 10. JS Doc Annotate your JavaScript with JS Doc types If you made the mistake of not starting withTypeScript © ABL - The Problem Solver 10
- 11. MappedTypes type RT = Readonly<T> type PT = Partial<T> type MyProps = React.ComponentProps<typeof MyComponent> type Returns = ReturnType<typeof someFunction>; type Args = Parameters<typeof someFunction> © ABL - The Problem Solver 11
- 12. ES Modules Named imports instead of import default Better with tooling and discoverability © ABL - The Problem Solver 12
- 13. React and import default © ABL - The Problem Solver 13
- 14. ESBuild © ABL - The Problem Solver 14
- 15. Hosting the front-end During development © ABL - The Problem Solver 15
- 16. Vite © ABL - The Problem Solver 16
- 17. Hosting the front-end In production © ABL - The Problem Solver 17
- 18. Azure Blob Storage © ABL - The Problem Solver 18
- 19. AzureCDN © ABL - The Problem Solver 19
- 20. Routing Rules © ABL - The Problem Solver 20
- 21. Deploy From GitHub © ABL - The Problem Solver 21
- 22. Test-Driven Development © ABL - The Problem Solver 22
- 23. The traditional testing pyramid Manual End to End Integration testing Unit testing
- 26. A better testing pyramid for the web Manual End to End Integration testing Unit testing
- 27. Cypress © ABL - The Problem Solver 27
- 28. Testing Front & Back End © ABL - The Problem Solver 28
- 29. Intercepting AJAX Requests © ABL - The Problem Solver 29
- 30. APITypes andUpdates © ABL - The Problem Solver 30
- 31. OpenAPI © ABL - The Problem Solver 31
- 32. Swashbuckle for the Azure Function © ABL - The Problem Solver 32
- 33. NSwag Generates TypeScript Interfaces © ABL - The Problem Solver 33
- 34. APIVersion © ABL - The Problem Solver 34
- 35. Required ValueTypes © ABL - The Problem Solver 35
- 36. ValidateAPI Validate all data that crosses an external boundary User input Data from an API © ABL - The Problem Solver 36
- 37. Type Mapping © ABL - The Problem Solver 37
- 38. Long living clients Some users never close their browser The same old version of the SPA can remain active Even when a newer version is available on the server Send the client version the server with each AJAX request © ABL - The Problem Solver 38
- 39. Checking the version © ABL - The Problem Solver 39
- 40. AJAX requests The public internet is unreliable Some requests will fail for random reasons Use a retry policy to handle network errors © ABL - The Problem Solver 40
- 41. Retry Policy © ABL - The Problem Solver 41
- 42. Workflow © ABL - The Problem Solver 42
- 43. Workflow Use short-lived Git feature branches A few hours at most Hide new or risky code behind a feature flag Initially only available for developers/testers © ABL - The Problem Solver 43
- 44. Release Strategy Release new features to a subset of users first Fast Ring with user opt in Percentage of users One or more companies One or more regions/countries © ABL - The Problem Solver 44
- 45. Feature Flags © ABL - The Problem Solver 45
- 46. Feature Flags A simple feature flag system is not hard But can become quite elaborate Consider using a service like Azure App Configuration Or a service like LaunchDarkly © ABL - The Problem Solver 46
- 47. Azure Configuration Function © ABL - The Problem Solver 47
- 48. React Configuration Provider © ABL - The Problem Solver 48
- 49. Conditional Rendering © ABL - The Problem Solver 49
- 50. Runtime errors © ABL - The Problem Solver 50
- 51. Runtime errors Runtime errors need to be tracked There is no code without bugs Features like LocalStorage will be disabled for some users Azure Application Insights works well Tracks unhandled exceptions Add an Error Boundary and track component errors © ABL - The Problem Solver 51
- 52. Runtime errors © ABL - The Problem Solver 52
- 53. Application Insights © ABL - The Problem Solver 53
- 54. Application Insights © ABL - The Problem Solver 54
- 55. Conclusion TypeScript is a must have For any serious development Use BLOB storage & CDN Easy, fast and cheap hosting Test-driven development prevents bugs Use an End to End tool like Cypress API types and updates Automate the client types Always validate the incoming data Workflow Use small and very short lived branches Use feature flags to hide new code in production Runtime errors will happen Make sure you track them © ABL - The Problem Solver 55
- 56. Maurice de Beijer @mauricedb maurice.de.beijer @gmail.com © ABL - The Problem Solver 56
Editor's Notes
- #2: Repository: http://bit.ly/pro-hooks-2021 Slides: http://theproblemsolver.nl/pro-hooks-2021.pdf