Node version 12, but used another?

I don’t know why, but when i try do travis tests i see this

I used Node 12 - in tests i have simple async function (node 12 know it)
But behaviour like travis use different verion of Node
After using Bable JS problem is gone

help please

link to problem build:
repository and branch:
problem PR:

The build on the link doesn’t have the output shown.