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TypeScript 1.1
完整的破坏性改动列表请到这里查看:breaking change issues。
null和undefined明显的错误使用方式现在会报错
例子:
TypeScript
var ResultIsNumber17 = +(null + undefined);
// Operator '+' cannot be applied to types 'undefined' and 'undefined'.
var ResultIsNumber18 = +(null + null);
// Operator '+' cannot be applied to types 'null' and 'null'.
var ResultIsNumber19 = +(undefined + undefined);
// Operator '+' cannot be applied to types 'undefined' and 'undefined'.
相似地,把null和undefined当做具有方法的对象使用时会报错。
例子:
TypeScript
null.toBAZ();
undefined.toBAZ();