jeffmo · May 11, 2016 17:49
diff --git a/mixedExample.js b/mixedExample.js
 var a: mixed = foo();
 var b: number;

 b = a; // error! `a` might not be a number... Could be anything!

 if (typeof a === 'number')) {
  b = a; // This is safe -- no error
 } else {
  throw new Error('Unexpected type of `a`!');
 }
	var a: mixed = foo();
	var b: number;

	b = a; // error! `a` might not be a number... Could be anything!

	if (typeof a === 'number')) {
	b = a; // This is safe -- no error
	} else {
	throw new Error('Unexpected type of `a`!');
	}