Unspecified properties emerge post-Angular update

We recently consolidated multiple Angular 16 projects into one NX mono repository using Angular 17. Everything is functioning properly, EXCEPT we have noticed a peculiar change in behavior with our models. Previously, unset properties were simply not displayed at all... but now, they are explicitly marked as "undefined". This can occasionally lead to issues when interacting with HTTP APIs because they interpret this "undefined" as an actual value...

Pre-migration example:
https://i.sstatic.net/MBSV0K0p.png

Post-migration example:
https://i.sstatic.net/J5SlHE2C.png

I am considering making a change in TypeScript like

{
   "compilerOptions": {
    "strictPropertyInitialization": true
    }
}

However, all values are currently set to false... (and it's a compilation setting) My question is.. what could have triggered this shift in behavior?

Edit : I was able to replicate the new behavior in the same mono repo but with Angular 16. Therefore, it doesn't seem to be linked to Angular 17. It might still be due to a new version of TypeScript or a global configuration update.. I just can't pinpoint which one.

angulartypescript

Answer №1

When we switch from

"target": "es2022",

to

"target": "es2016",

we noticed a return to the previous functionality. Despite this, I still believe it's important to handle undefined values correctly, so we will continue using ES2022.

It appears that the actual modification is associated with

"useDefineForClassFields": false,

I have come across instances where Angular has set this to false... however, toggling it to true/false, while still using ES2022, can alter or reverse the behavior of undefined class properties.

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