Libraries.prototype.logVersions = function(): void {
    let libs = this._registry;
    let nameLengths = libs.map(item => get(item, 'name.length'));
    let maxNameLength = Math.max.apply(null, nameLengths);

    debug('-------------------------------');
    for (let i = 0; i < libs.length; i++) {
      let lib = libs[i];
      let spaces = new Array(maxNameLength - lib.name.length + 1).join(' ');
      debug([lib.name, spaces, ' : ', lib.version].join(''));
    }
    debug('-------------------------------');
  };

/**
 * @ember/debug tests
 */
runInDebug(); // $ExpectError
runInDebug(() => console.log('Should not show up in prod')); // $ExpectType void

// Log a warning if we have more than 3 tomsters
const tomsterCount = 2;
warn('Too many tomsters!'); // $ExpectType void
warn('Too many tomsters!', tomsterCount <= 3); // $ExpectType void
warn('Too many tomsters!', tomsterCount <= 3, { // $ExpectType void
    id: 'ember-debug.too-many-tomsters'
});

debug(); // $ExpectError
debug('Too many tomsters!'); // $ExpectType void
debug('Too many tomsters!', 'foo'); // $ExpectError

// Test for truthiness
const str = 'hello';
assert('Must pass a string', typeof str === 'string'); // $ExpectType void

// Fail unconditionally
assert('This code path should never be run'); // $ExpectType void

// next is not called, so no warnings get the default behavior
registerWarnHandler(); // $ExpectError
registerWarnHandler(() => {}); // $ExpectType void
registerWarnHandler((message, { id }, next) => { // $ExpectType void
    message; // $ExpectType string

 logErrorMessage(subject: string, message: string) {
   this.errorToast(subject, message);
   debug(message);
 }