Function urlOf

test/css-syntax-error.test.ts:282–284

(file: string)

test('uses source map', () => {
  function urlOf(file: string): string {
    return pathToFileURL(join(__dirname, file)).toString()
  }

  let concat = new Concat(true, join(__dirname, 'build', 'all.css'))
  concat.add(urlOf('a.css'), 'a { }\n')