function isSafeTest(a: string | SafeString) {
  if (isHTMLSafe(a)) {
      a = a.toString();
  }

  camelize(a);
}

import { dasherize, camelize, capitalize, classify, decamelize, htmlSafe, loc, underscore, w, isHTMLSafe } from '@ember/string';
import { SafeString } from '@ember/string/-private/handlebars';

dasherize(); // $ExpectError
dasherize('blue man group'); // $ExpectType string
dasherize('', ''); // $ExpectError

camelize(); // $ExpectError
camelize('blue man group'); // $ExpectType string
camelize('', ''); // $ExpectError

decamelize(); // $ExpectError
decamelize('blue man group'); // $ExpectType string
decamelize('', ''); // $ExpectError

underscore(); // $ExpectError
underscore('blue man group'); // $ExpectType string
underscore('', ''); // $ExpectError

w(); // $ExpectError
w('blue man group'); // $ExpectType string[]
w('', ''); // $ExpectError

classify(); // $ExpectError
classify('blue man group'); // $ExpectType string
classify('', ''); // $ExpectError

capitalize(); // $ExpectError
capitalize('blue man group'); // $ExpectType string
capitalize('', ''); // $ExpectError

const collectionNameForType = (type: any) => pluralize(camelize(typeof(type) === 'string' ? type : type.modelName));