Modern Enterprise Application Development with Angular, Nestjs, Azure

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Modern Enterprise App Dev With Azure & Typescript

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@JecelynYeen GDE - Web technologies, Angular Software Architect

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Typescript in General Backend - Nodejs & Nestjs Frontend - Angular Infrastructure - Azure Live Demo Maybe?

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Back in the day, when I was .NET Developer...

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This is how I see JavaScript... - JQuery, for cosmetic purpose and AJAX! - Dynamic, you can do anything - Messy, for toy project only - No intellisense - For client only - Hipster, why split to front-end and back-end? - Why no GUI, why command line only? - Why no out-of-the box template? - How do I host it? Where is my IIS?

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The Game Changer

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Typescript - By Microsoft - Provide types, no more magic - Intellisense, yay! - Great tooling supports - C# like coding experiences

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Foundation for Angular & Nestjs

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Backend

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Story of Building LEGO house

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Simple, Intuitive, Easy to Start

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Structure, Details, Layout

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Design & Plan Modular Ecosystem

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JavaScript runtime that build on top of Google Chrome’s V8 engine

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Nodejs is simple - Setup Time: 1 minute - Code: 2 lines

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Why Nodejs?

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Nodejs is simple. Wait, what is the deﬁnition of simple?

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Nodejs is simple up to a certain point When build medium - large applications, the deﬁnition of simple change.

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Application Issues (Medium to Large) - Nodejs Lack of Common Architecture Fragile Execution Problematic Growth

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We need... Structure Robustness Scalability

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“We build our computer (systems) the way we build our cities. Over time, without a plan, on top of ruins.” - Ellen Ullman

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Why Nestjs? Application Structure Dependency Injection Middleware Structure Platform Agnostic

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What’s (the good stuffs) in the project?

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Core Concepts

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Find out more about Nestjs: https://speakerdeck.com/chybie/progressive- nest

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Frontend

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Challenges of building Enterprise Software

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Reliability & Stability

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Reliability & Stability - Google internally have 400+ applications using Angular - Pre-release tests for free - Before release new version of Angular, Google will ﬁrst test on their applications make sure it works - Angular is open source (link), all codes & issues reported are transparent - Predictable versioning & releases (link) - Semantic release: major.minor.patch - A major release every 6 months - 1-3 minor releases for each major release - A patch release almost every week - Built-in protection for common web vulnerabilities (link) - Update guide & CLI command for update Angular application

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S Structure

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Structure - Angular CLI to create projects, generate diﬀerent blueprints(components, services) - Provide standard project skeleton - Workspace concept(link) - Test setup - unit test, end-end - Dev server & build command ready - Angular styleguide (link) and built-in linting - Nx from nrwl.io - an open source toolkit for enterprise Angular applications - Dependency injection - Out of the box solution - routing, http client, forms, polyﬁlls, css preprocessor

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S Robustness

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Robustness - Typescript - Static typing, no more fragile execution - Linting - eliminate possible errors before commits - Angular Language Service (vscode extensions) - report errors during editing

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S Scalability

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Scalability: Team - Hiring & training - How fast to get a junior (fresh) productive? - How fast to get a programmer to be productive? - Full stack development - Can backend developers leverage their skills in frontend? - Resources available - videos, stackoverﬂow, community

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Scalability: Application - Resources available - open source libraries - Enterprise grade (paid): Telerik, DevExtreme - Components & Design systems: PrimeNg, Material UI, Nebula, Clarity, ngx-bootstrap, ngx-admin - State management - NgRx, NgXs, Akita, MobX - Plugins - Firebase, Auth0, Angular CDK - Learn once, use everywhere - Ionic (Hybrid) - NativeScript (Native) - NestJs (Backend) - Lazy loading built in - Built-in Optimization

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“It’s never on how difficult is to write bad code, it’s on how easy is to write good code.”