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いなきゃ

if (someone) isn’t there, if (someone) weren’t there

→ 居る
い be; be present + なきゃ Necessity (if not)
verb · informal Rare #26,408
if (someone) isn’t there, if (someone) weren’t there A colloquial contraction of いなければ. Often followed by いけない or ならない to express that someone has to be somewhere.
JA: 君がいなきゃ困る。
EN: I’d be in trouble if you weren’t here.
Conjugation of 居る
Necessitative
いるべきいなきゃ

本当に感謝ですこの人がいなきゃどうなってたか感謝します

I'm truly grateful. I don't know what would have happened without this person. Thank you.

— タクシー運転手 約束は海を越えて (2017)

トムは今日家にいなきゃ駄目なの？

Does Tom have to stay home today?

だから誰かがいなきゃダメ

So someone has to be there.

— 崖の上のポニョ (2008)

まずは誠実でいなきゃ駄目だよ。

First and foremost, you have to be honest.

トムって、そこにいなきゃいけないの？

Does Tom really have to be there?

お前がいなきゃ俺は死んでたヴァスカ！

Without you, I'd have died, Vaska!

— 動くな、死ね、甦れ！ (1990)

お前が隣にいなきゃ

If you weren't by my side...

— オープン・ユア・アイズ (1997)