fix(component-store): fix memoization not working when passing selectors directly to select

[P4]

This makes selectors created with createSelector usable with ComponentStore.select
which looks like it should work, but would previously result in the selector getting recomputed each time.

When select method is called with a single argument, the projector function was being passed directly to map, which invokes its callback with an extra index argument. This is basically the same problem as the JS gotcha where [1,2,3].map(parseInt) returns [1, NaN, NaN].

Because the value of index is different each time, the memoized selector would get invalidated even if the actual state remained exactly the same.

PR Checklist

Please check if your PR fulfills the following requirements:

• The commit message follows our guidelines: https://github.com/ngrx/platform/blob/master/CONTRIBUTING.md#commit
• Tests for the changes have been added (for bug fixes / features)
• Documentation has been added / updated (for bug fixes / features)

PR Type

What kind of change does this PR introduce?

[x] Bugfix
[ ] Feature
[ ] Code style update (formatting, local variables)
[ ] Refactoring (no functional changes, no api changes)
[ ] Build related changes
[ ] CI related changes
[ ] Documentation content changes
[ ] Other... Please describe:

What is the current behavior?

Given

const memoizedSelector = createSelector(...)

passing it to a component store directly

componentStore.select(memoizedSelector)

results in the selector being re-computed on each store update, even if the state does not actually change.

The memoization works fine again if the selector is wrapped inside an extra function:

componentStore.select(state => memoizedSelector(state))

What is the new behavior?

Both usages of select() shown above should now work the same way.

Does this PR introduce a breaking change?

[ ] Yes
[x] No

Other information

[netlify]

✅ Deploy Preview for ngrx-io canceled.

Built without sensitive environment variables

Name	Link
🔨 Latest commit	1866f8b
🔍 Latest deploy log	https://app.netlify.com/sites/ngrx-io/deploys/623f614b49a7e800093e2956

[timdeschryver]

Thanks @P4 ! 🏆