replace var with let/const where appropriate.

[dayopius]

Fixes #1086 (<=== Add issue number here)

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[gitpod-io]

[dayopius]

@TildaDares

[TildaDares]

Great work @dayopius. Thank you!!

[TildaDares]

@dayopius The build is failing because you used double quotes instead of single quotes. Can you change them back please? Thanks!

[TildaDares]

Feel free to just click the Commit Suggestion buttons @dayopius

[TildaDares]

Amazing work @dayopius. Thank you!

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