i try to use String.normalize("NFD").replace(/[\u0300-\u036f]/g, "") but i have this error in IE11
ERROR TypeError: L’objet ne gère pas la propriété ou la méthode « normalize »
You got the error in IE 11 because IE doesn't support normalize.
You need to use polyfill to support normalize in IE 11. You can use module unorm to provide support for normalize in IE 11.
npm install unorm.import 'unorm'; at the file where you write the normalize function.