Enable strictNullChecks mode for aio codebase #20646

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1. IgorMinar

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   on Nov 27, 2017
2. gkalpak commented on Nov 28, 2017

   

   gkalpak

   on Nov 28, 2017

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   Should we enable all --strict checks? Please? 😛
   From the TS handbook:

   --strict
   Enable all strict type checking options.
   Enabling --strict enables --noImplicitAny, --noImplicitThis, --alwaysStrict, --strictNullChecks and --strictFunctionTypes.

   👍React with 👍1Reacted by Daniel Wulff
3. trotyl commented on Nov 28, 2017

   

   trotyl

   on Nov 28, 2017

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   @gkalpak the --strict master option in tsconfig will break Angular in TypeScript 2.7 due to the new --strictPropertyInitialization option. It was mentioned in microsoft/TypeScript#15360 and microsoft/TypeScript#20117.
4. gkalpak commented on Nov 28, 2017

   

   gkalpak

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   Thx for the heads-up 👍

   We can always explcitly opt-out of specific options. That's better than opt into imo.
   Also, I am not sure why this is incompatible with Angular (why can't you initialize input properties anyway)?

   Also, we just landed support for TS 2.5. Let's worry about 2.7 when we get there 😃
5. trotyl commented on Nov 28, 2017

   

   trotyl

   on Nov 28, 2017

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   I am not sure why this is incompatible with Angular

   In Angular we always initialize input properties AFTER constructor and before ngOnInit, so that's an error in TypeScript as it cannot detect the initialization (and if the properties are not nullable).

   We can always explcitly opt-out of specific options.

   That's a good idea, but Angular CLI seems unable to auto-update tsconfig, so may not apply there (sorry for off-topic, still fine for angular.io). 😄
6. gkalpak commented on Nov 28, 2017

   

   gkalpak

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   I mean there is nothing stopping you from initializing input properties in the component:

   @Component({
     template: 'Hello, {{ name }}!',
   })
   class GreetingComponent {
     @Input() name = 'world';
   }
7. trotyl commented on Nov 28, 2017

   

   trotyl

   on Nov 28, 2017

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   That's true, but I guess most input properties may not have a default value? 😄
8. gkalpak commented on Nov 28, 2017

   

   gkalpak

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   You can always explicit | null = null 😃
   Just to be clear, we are talking about just the angular.io app. But even if we end up turning --strictPropertyInitialization off, it is better to be "strict by default" 😃
9. danwulff commented on Nov 28, 2017

   

   danwulff

   on Nov 28, 2017

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   I feel like enabling the --strict flag, would provide for the safest / best use of typescript protection going forward. This would definitely be an undertaking for all of Angular but maybe shooting for this in release 6.0 could be a possibility? I hope @IgorMinar and the Angular team would at least take this into consideration.

   From the typescript 2.3 release notes: https://www.typescriptlang.org/docs/handbook/release-notes/typescript-2-3.html#new---strict-master-option

   New checks added to TypeScript are often off by default to avoid breaking existing projects. While avoiding breakage is a good thing, this strategy has the drawback of making it increasingly complex to choose the highest level of type safety, and doing so requires explicit opt-in action on every TypeScript release. With the --strict option it becomes possible to choose maximum type safety with the understanding that additional errors might be reported by newer versions of the compiler as improved type checking features are added.
10. petebacondarwin

    self-assigned this

    on Jan 5, 2018
11. alexeagle

    added a commit that references this issue on Jan 12, 2018

    style(aio): enforce strict TypeScript checks (#21342)

    ...

    This issue will close once commit 71dd92b is merged into the 'main' branch.

    71dd92b
12. alexeagle

    closed this as completedin c5c6d84on Jan 12, 2018
13. angular-automatic-lock-bot commented on Sep 13, 2019

    

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