'.no-shrink' class may be needed in flex utilities.

[ganesh-vellanki]

In flex-box utilities need no-shrink class (in my opinion), this helps when someone want to shrink only one row in a page of multiple rows.

[iatek]

This would be a nice compliment to the .flex-fill class.

.flex-shrink {
    flex-shrink: 0;
}

I found it's necessary when using flex-column and flex-fill to grow 1 row in height, other rows get squished. Adding flex-shrink:0 to the other rows prevents this.