How to properly configure imagemin?

Question

Web development

I decided to get acquainted with imagemin (I used to use tinypng in the browser, but then the number of images increased dramatically). I was not very satisfied with the default compression level, I decided to raise it. But here everyone contradicts each other:
1 - Docks of imagemin itself:

.pipe(imagemin([
    imagemin.optipng({optimizationLevel: 5}),
]))
Note that you may come across an older, implicit syntax. In versions < 3, the same was written like this:

.pipe(imagemin({
    optimizationLevel: 5,

Okay, well, the console swears at the point here - imagemin.jpegtran Installed
via npm optipng, but it's no use
2 - optipng plugin docks:

const imageminOptipng = require('imagemin-optipng');

imagemin(['images/*.png'], 'build/images', {use: [imageminOptipng()]}).then(() => {
  console.log('Images optimized');
});

It’s clear with the addresses, but where then is the level set up?
In short, I'm confused. The plugin is popular, the answer should be simple, right?) Version 3.2.0