bug: ion-input autocapitalize type should be string literal type

[rangzen]

Bug Report

Ionic version:
[x] 5.0.7

Current behavior:
autocapitalize is a string.

Expected behavior:
autocapitalize should be 'on' or 'off'.

I will send a PR.

[liamdebeasi]

Thanks for the issue, and apologies for the delay. While the experience here is not ideal, the autocapitalize property is working as intended.

The underlying problem is with how TypeScript types the autocapitalize property: https://github.com/microsoft/TypeScript/blob/9c87ded2b3fc4ba4a9a7656e9be39d5e404e6ab6/lib/lib.dom.d.ts#L6360

As shown in the link, the autocapitalize property is of type string in TypeScript's codebase. This means that any type narrowing we do is going to cause a TypeScript error. In this case 'off' | 'on' | 'none' | 'sentences' | 'words' | 'characters' is narrower than the expected string type which is why you got the errors in #21464 (comment).

If TypeScript narrows their types, we will be more than happy to reconsider adding this change to Ionic's codebase. I am going to close this, but let me know if you have any questions. Thank you!

[ionitron-bot]

Thanks for the issue! This issue is being locked to prevent comments that are not relevant to the original issue. If this is still an issue with the latest version of Ionic, please create a new issue and ensure the template is fully filled out.