如果不启用此规则,即 exactOptionalPropertyTypes: false 情况下,colorThemeOverride 则可以设置三个值:“dark”、“light”、“undefined”。 declarefunctiongetUserSettings():UserDefaults;// ---cut---constsettings =getUserSettings(); settings.colorThemeOverride="dark"; settings.colorThemeOverride="light"; ...
p.age,p.friend);// 结果:tom 18 { name: 'jerry' }// p.friend = {name:'lisi'}; // 报错: cannot assign to 'friend' because it is a read-only property.if(p.friend) {
function*uppercase(iter:Iterator<string, BuiltinIteratorReturn>) {while(true) {const{ value,done}=iter.next();yieldvalue.toUppercase();// ~~~ ~~~// error! ┃ ┃// ┃ ┗━ Property 'toUppercase' does not exist on type 'string'. Did you mean 'toUpperCase'?// ┃// ┗━ 'value' i...
class Foo { private readonly userList: string[] = []}子类继承父类时，如果需要重写父类方法，需要加上 override 修辞符class Animal { eat() { console.log('food') }}// Badclass Dog extends Animal { eat() { console.log('bone') }}// Goodclass Dog extends Animal { overr...
文档工具可以强制一致地应用@virtual、@override和/或@sealed修饰符,但是这不是TSDoc标准所要求的。 例如: class Base {/** @virtual */public render(): void {}/** @sealed */public initialize(): void {}}class Child extends Base {/** @override */public render(): void;} ...
} public List<PropertyDef> Properties { get; set; } public List<MethodDef> Methods { get; set; }} class PropertyDef{ public string Name { get; set; } public bool IsPublic { get; set; } public bool IsStatic { get; set; } public string Type { get; set; } public override string ...
// You can override the _destruct method if you need, for example: _destruct: function () { for (var key in this) { if (this.hasOwnProperty(key)) { switch (typeof this[key]) { case 'string': this[key] = ''; break; case 'object': case 'function': this[key] = null; brea...
noImplicitOverride:Ts4.3引入的配置,开启此选项保证子类重写基类的方法是,必须在方法前加上override关键词。 noImplicitReturns:开启这个选项保证编译时所有条件分支都返回一致的类型。 noProertyAccessFromIndexSignature:从名称入手来理解这个配置, no property access from index signature, 就是说开启后禁止通过访问常规属...
newProperty = "new property"; hello = "override"; } } @classDecorator class Greeter { property = "property"; hello: string; constructor(m: string) { this.hello = m; } } console.log(new Greeter("world")); 1. 2. 3. 4.
Keep in mind TypeScript will prevent this at compile time, but in theory since it is compiled down to JavaScript you can still override a readonly property.Example interface Person { name: string; age: number; } const person: Readonly<Person> = { name: "Dylan", age: 35, }; person....