nl2br helper

controllers.application.js

import Ember from 'ember';

export default Ember.Controller.extend({
  appName: 'Ember Twiddle',
  someContent: `hello world
and a newline
whoa
foo
bar`
});

helpers.nl2br.js

import Ember from 'ember';

const {
  Helper: { helper },
  String: { htmlSafe }
} = Ember;

export function nl2br([text]) {
  var breakTag = '<br />';
  return new htmlSafe((text + '').replace(/([^>\r\n]?)(\r\n|\n\r|\r|\n)/g, '$1' + breakTag + '$2'));
}

export default helper(nl2br);

templates.application.hbs

<h1>Welcome to {{appName}}</h1>
{{nl2br someContent}}

twiddle.json

{
  "version": "0.8.1",
  "EmberENV": {
    "FEATURES": {}
  },
  "options": {
    "use_pods": false,
    "enable-testing": false
  },
  "dependencies": {
    "jquery": "https://cdnjs.cloudflare.com/ajax/libs/jquery/1.11.3/jquery.js",
    "ember": "2.5.1",
    "ember-data": "2.5.2",
    "ember-template-compiler": "2.5.1"
  }
}