The Puppet Master's Guide to Injection Tokens

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The Puppet Master's Guide to Injection Tokens Markus Ingvarsson @markusingvarssn

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https://blog.angular.io/angular-v16- is-here-4d7a28ec680d

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Angular Developer Survey 2022 Results Summary https://blog.angular.io/angular- developer-survey-2022-results- summary-d17c88f62690

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Let’s demystify Injection Tokens! 5

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Let’s demystify Injection Tokens! After this talk, you will know o The essentials of Angular’s Dependency Injection and Injection Tokens o The role of Injection Tokens in enhancing app flexibility and configurability o Hands-on usage of Injection Tokens in real-world scenarios.

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Hello! I’m Markus @markusingvarssn 7

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Gothenburg

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Gothenburg

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The InjectionToken https://angular.io/api/core/InjectionToken

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Dependency Injection in Angular A quick recap

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Dependency Injection in Angular A quick recap

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Node Injector yn Node Injector yn-1 Node Injector y1 The Injectors’ role - creating and retrieving dependencies in the app. Node Injector Hierarchy Environment Injector Hierarchy Root Injector Platform Injector Null Injector

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https://www.youtube.com/watch?v=ZQ9EuzqYLnU

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GreatGrandChild Node Injector Node Injector yn-1 Node Injector y1 The Injectors’ role - creating and retrieving dependencies in the app. Node Injector Hierarchy Environment Injector Hierarchy Root Injector Platform Injector Null Injector GreatGrand ChildCmp

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GreatGrandChild Node Injector GrandChild Node Injector Node Injector y1 The Injectors’ role - creating and retrieving dependencies in the app. Node Injector Hierarchy Environment Injector Hierarchy Root Injector Platform Injector Null Injector GreatGrand ChildCmp

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GreatGrandChild Node Injector GrandChild Node Injector The Injectors’ role - creating and retrieving dependencies in the app. Node Injector Hierarchy Environment Injector Hierarchy Root Injector Platform Injector Null Injector GreatGrand ChildCmp App Node Injector

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Dependency Injection in Angular A quick recap

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Providers in Angular

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Providers in Angular

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https://angular.io/api/core/inject Traditional way Angular 14+ “way” (we’ll favor this one)

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https://www.youtube.com/watch?v=bH3ASMHgIFE&t=0s

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Providers in Angular

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Providers in Angular

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Providers in Angular

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Providers in Angular

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Providers in Angular

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*drumroll*

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InjectionTokens in Angular

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Built in InjectionTokens in Angular

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Checkout Component Injector Node Injector yn-1 Node Injector y1 The Injectors’ role - creating and retrieving dependencies in the app. Node Injector Hierarchy Environment Injector Hierarchy Root Injector Platform Injector Null Injector showError: false showError: false STEPPER_GLOBAL_OPTIONS STEPPER_GLOBAL_OPTION

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Summary o Clarified some core concepts of Angular’s Dependency Injection o Uncovered how Injection Tokens can dynamically alter an app’s behaviour o Examples of using Injection Tokens for HTTP requests, pipes and components

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Further Reading Angular Documentation o https://angular.io/guide/dependency-injection-overview o https://angular.io/api/core/InjectionToken Decoded Frontend – Dependency Injection in Angular @ Youtube o https://www.youtube.com/watch?v=G8zXugcYd7o&list=PLX7eV3JL9sfmJ6Aa Zj9eDlAKrJrEul4Vz Thomas Laforge – Deep dive into the DI system @ Angular Tiny Conf o https://www.youtube.com/watch?v=ZQ9EuzqYLnU Kamil Galek – 5 cool usages of inject function in Angular @ NG-BE 2023 o https://www.youtube.com/watch?v=bH3ASMHgIFE&t=0s

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The Puppet Master's Guide to Injection Tokens Markus Ingvarsson @markusingvarssn https://github.com/markusingvarsson /acm-puppet-master-injectiontokens Thank you!