After switching to "BLOCKS" mode, the program didn't run

[Helen09]

Repro steps:
• Navigate to https://makecode.adafruit.com/beta#editor
• Copy the below code on "JavaScript" pane and the click button A

let strip = light.createStrip()
input.buttonA.onEvent(ButtonEvent.Click, () => {
strip.showAnimation(light.cometAnimation, 2000)
})

• Switch to "BLOCKS" mode and click button A again

Expect result:
After clicking button A, the program should run in "BLOCKS“ mode as in 'JavaScript' mode
Actual result:
After switching to "BLOCKS" mode, the program didn't run

[samelhusseini]

There's something funny going with the decompilation. @riknoll

let strip = light.createStrip()
input.buttonA.onEvent(ButtonEvent.Click, () => {
strip.showAnimation(light.cometAnimation, 2000)
})

is decompiled into

and then back to

let strip: light.NeoPixelStrip = null
input.buttonA.onEvent(ButtonEvent.Click, function () {
    strip.showAnimation(light.cometAnimation, 2000)
})
strip = light.createStrip(pins.A1, 0)

hence why it's not running.

[samelhusseini]

Same issue here: #626

[samelhusseini]

Another here: #603

[samelhusseini]

Another dupe here: #593

[pelikhan]

952869c

[lock]

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