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が来るよ

is coming

→ が
phrase Uncommon #8,132
is coming Used after the subject to say that someone or something is coming. The よ adds emphasis or signals that this is new information for the listener. Depending on context, 来る can also mean “will come.”
JA: もうすぐ春が来るよ。
EN: Spring is coming soon.

寝ないと…ハアティが来るよ

If you don't go to sleep... Haati will come.

— तुम्बाड (2018)

おばあさん寝ないとハスターが来るよ！

Grandma, if you don't go to sleep, Hastur will come!

— तुम्बाड (2018)

お父さん寝なさい…寝ないとハスターが来るよ！

Daddy, go to sleep… If you don’t, Hastur will come!

— तुम्बाड (2018)

移動遊園地が来るよ

A traveling carnival is coming.

— パディントン２ (2017)

寝ないとハスターが来るよ

If you don't go to sleep, Hastur will come.

— तुम्बाड (2018)

その時はこう言うのよ…「寝ないとハスターが来るよ！」

That’s when you say… “If you don’t go to sleep, Hastur will come!”

— तुम्बाड (2018)

マガーが来るよ…

Maga is coming...

— तुम्बाड (2018)

寝ないと…ヒランが来るよ

If you don't go to sleep… Hiran will come.

— तुम्बाड (2018)

寝ないとハブバッドが来るよ

If you don't go to sleep, Habbad will come.

— तुम्बाड (2018)

寝ないと…寝ないとハティーが来るよ…

If you don’t go to sleep... if you don’t go to sleep, Hattie will come...

— तुम्बाड (2018)