feat(angular): setting props on a signal works

[sean-perkins]

Issue number: resolves #28876

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What is the current behavior?

When assigning componentProps as inputs to an Angular component, we do Object.assign. When using the newer Angular Signals API for inputs the value of an input is a function:

myInput = input<string>('foo') // this is a function

The developer accesses the value of myInput in a template by doing myInput() since myInput is a function.

If a developer passes componentProps: { myInput: 'bar' } then the value of myInput is set to this string value, overriding the function. As a result, calling myInput() results in an error because myInput is a string not a function.

What is the new behavior?

• Angular 14.1 introduced setInput which lets us hand off setting inputs to Angular. This will set input values properly even when using a Signals-based input.

Does this introduce a breaking change?

• Yes
• No

As part of this NavParams has been deprecated as it is incompatible with the setInput API. The old Object.assign worked to allow devs to get all of the componentProp key value pairs via NavParams even if they are not defined as Inputs. Using setInput will now throw an error, so developers need to create an @Input for each parameter. This means that NavParams has no purpose and can safely be retired in favor of Angular's Input API. Not removing NavParms would make it difficult for us to support new Angular APIs such as this Signals-based input API.

Other information

Dev build: 8.1.1-dev.11715021973.16675b67

You will need to update the Ionic config to opt-in to the new option:

useSetInputAPI: true,

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Name	Status	Preview	Comments	Updated (UTC)
ionic-framework	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	May 6, 2024 7:01pm

[thetaPC]

LGTM, verified in the build app and provided repro from the original issue.

[ntorrey]

Woohoo! Can't wait for the 8.2 release. It will be good to finally move off of the dev version I've been using (not in production of course 😬). Thanks for your work on this!