Add generics to httpsCallable

[hsubox76]

Add RequestData and ResponseData generics to httpsCallable. RequestData is the arg provided to the callable function (only one allowed). The callable function returns a promise with a data field, and RequestData describes whatever is in that data field.

Used the generics in a couple of httpsCallable tests as a check to make sure the typing works, and left them out of some tests to make sure it also works if they are omitted.

[changeset-bot]

⚠️ No Changeset found

Latest commit: 14dbd51

Merging this PR will not cause a version bump for any packages. If these changes should not result in a new version, you're good to go. If these changes should result in a version bump, you need to add a changeset.

This PR includes no changesets

When changesets are added to this PR, you'll see the packages that this PR includes changesets for and the associated semver types

Click here to learn what changesets are, and how to add one.

Click here if you're a maintainer who wants to add a changeset to this PR

[google-oss-bot]

Binary Size Report

Affected SDKs

No changes between base commit (1003b8d) and head commit (3faaf66).

Test Logs

• Base (1003b8d9): https://github.com/firebase/firebase-js-sdk/actions/runs/593676656
• Head (3faaf664): https://github.com/firebase/firebase-js-sdk/actions/runs/593691995

[google-oss-bot]

Size Analysis Report

Affected Products

No changes between base commit (1003b8d) and head commit (3faaf66).

Test Logs

• Base (1003b8d): https://github.com/firebase/firebase-js-sdk/actions/runs/593676656
• Head (3faaf66): https://github.com/firebase/firebase-js-sdk/actions/runs/593691995

[mbleigh]

I believe at least the request (and maybe the response as well) must be objects. Scalars may not be allowed by the server-side implementation.

[hsubox76]

This is a live test that sends a number to the server and successfully gets a number response so it seems to work, unless I'm misunderstanding. To make sure, I also created a new onCall function that logged a number sent to it and returned a number and tried it from a test app and it seems to work:

exports.numberTest = functions.https.onCall((data) => {
    console.log(data, typeof data);
    return(44);
});

Let me know if I misunderstood.