main.dart

import 'dart:math';

final random = new Random();

void main() {
  var isString;
  if (random.nextBool()) {
    isString = 'It is a string';
    isString.notAMethod(); // Analyzer sees a String
  } else {
    isString = 'no really, always';
    isString.notAMethod();
  }
  isString.notAMethod(); // Analyzer sees dynamic
}