Hide mask caracters when field is empty

[fp-jcorriveau]

I try to achieve this exact behavior with IMaskedInput (react-imask) and I can't get how to do it

https://jsfiddle.net/7pe6cn1m/

When the field is empty, the dollar $ sign is not visible, when I type something in the field, it gets visible.

Any help would be appreciated.

[fp-jcorriveau]

The discussion was already created (#590), but since I had no answer, I did not know if discussions were handled.