I have a textarea and I'm trying to write a big text on it.
var ementa = element(by.xpath("//label[. = 'Descrição / Ementa*']/following-sibling::textarea"));
As you mentioned you are using Angular 2 , there were some issues with
sendKeys() in Angular 2 but they are fixed with latest version- Angular 2.0.0-rc.3. for more info you can check out this issue - https://github.com/angular/protractor/issues/3196