Update code to fix TS v.4.4 compiler errors

[srajiang]

Summary

Fix #1089 by updating code which causes Typescript v4.4.1 compiler errors.

Requirements (place an x in each [ ])

• I've read and understood the Contributing Guidelines and have done my best effort to follow them.
• I've read and agree to the Code of Conduct.

[codecov]

Codecov Report

Merging #1091 (fef4dc2) into main (bcca0ee) will increase coverage by 0.13%.
The diff coverage is 38.09%.

@@            Coverage Diff             @@
##             main    #1091      +/-   ##
==========================================
+ Coverage   70.90%   71.03%   +0.13%     
==========================================
  Files          13       13              
  Lines        1220     1229       +9     
  Branches      365      365              
==========================================
+ Hits          865      873       +8     
- Misses        284      287       +3     
+ Partials       71       69       -2     

Impacted Files	Coverage Δ
src/receivers/HTTPReceiver.ts	32.40% <0.00%> (+1.94%)	⬆️
src/receivers/SocketModeReceiver.ts	68.42% <0.00%> (-1.23%)	⬇️
src/App.ts	83.28% <100.00%> (+0.09%)	⬆️
src/conversation-store.ts	100.00% <100.00%> (ø)

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[srajiang]

Casting error to type any has added additional uncovered lines. I will take a look more tomorrow am at this!

[filmaj]

This looks good to me!

Perhaps any additional coverage improvements could be worked on in a separate PR in order to move ahead with merging this? This way the other PRs waiting on this project can move forward? The ESLint config update PR, for example, is itself a blocker to merging two other open PRs.

EDIT: Woops, didn't notice that the coverage diff GitHub Action check is actually blocking merging this PR - I'll see if I can add some tests to help that.

[seratch]

@filmaj

EDIT: Woops, didn't notice that the coverage diff GitHub Action check is actually blocking merging this PR - I'll see if I can add some tests to help that.

Oh, but I think that we don't need to be too strict about it. Particularly, for this pull request, we can consider merging it as early as possible not to block other pull requests.

[filmaj]

I've opened #1094 adding an additional test for HTTPReceiver that I issued with the intention of merging into this PR. I think it should help push code coverage up.

[filmaj]

Oh geez, I 'merged' my test expansion not realizing that this PR is based off of @srajiang's fork 😆 😢 🙈

Anyways, the ts-4.4 branch that exists on this repo's origin has the combination of this PR's commits + my one commit with a new test. Perhaps that can help in the quest for expanded code coverage! Feel free to merge into your PR if you wish, @srajiang.

[srajiang]

I've merged @filmaj your additional commit with the additional test, thanks for that. Thanks for weighing in @seratch - I'm going to merge this now despite the failing codecov/patch test.