@yaireo/tagify/src/polyfills/String.includes.js

lightweight, efficient Tags input component in Vanilla JS / React / Angular [super customizable, tiny size & top performance]

 if( !String.prototype.includes ){
    String.prototype.includes = function(search, start) {
      if (typeof start !== 'number')
        start = 0;

      if (start + search.length > this.length)
        return false;

      else
        return this.indexOf(search, start) !== -1;
    };
}