参考链接: https://www.infoq.com/news/2023/03/announcing-TypeScript-5-beta/ https://medium.com/@caopengau/typescript-5-0-a-quick-demo-of-new-features-and-improvements-fbb841728ea
TypeScript 5 on its own doesn’t bring any earth-shattering changes that makes an immediate upgrade necessary. However, the major release is used to implement some breaking changes that harmonize with upcoming ECMAScript features. Especially the new decorators changes will lead to some adjustments f...
[Properties in keyof T as NewKeyType]: T[Properties] } 上面示例代码,MappedTypeWithNewProperties对传出的泛型进行处理后,产生的新的类型所有属性都会以NewKeyType进行命名。 这里结合模板字符串,基于泛型的先前属性名创建新的属性名: type GettersPrefix<T> = { [Property in keyof T as `get_${string &...
Because these arrows flow in opposite directions, we would sayPackager<T>iscontravariantonT TypeScript 5 gives us the ability tostatethat we intendPackager<T>to be (and remain)covariant onTusing theinkeyword before the typeParam. interfacePackager<inT>{package:(item:T)=>void;} Invariance What h...
We didn’t mention it much, but when we switched to modules, we also switched to a more modern emit target. We switched from ECMAScript 5 to ECMAScript 2018. Using more native syntax meant that we could shed a few bytes in our output, and would have an easier time debugging our code...
classHistory{commit(element,from,to){// ...}}// 更新单个字段history.commit(element,{left:0},{left:10})// 或者更新多个字段history.commit(element,{left:5,top:5},{left:10,top:10}) 基于工程经验,这个commit方法需要满足两个目标: 能够适配所有不同类型的 Element。
npm WARN EBADENGINE Unsupported engine { npm WARN EBADENGINE package: 'typescript@5.1.0-beta', npm WARN EBADENGINE required: { node: '>=14.17' }, npm WARN EBADENGINE current: { node: 'v12.22.12', npm: '8.19.2' } npm WARN EBADENGINE } from Yarn: Copy error typescript@5.1...
Sorry, your browser doesn't support HTML 5 video. Set"typescript.suggestionActions.enabled"tofalseto disable suggestions. Next steps Read on to find out about: Editing TypeScript- Learn about VS Code editing features for TypeScript. Debugging TypeScript- Configure the debugger for your TypeScript...
目前为止,本文给出的所有代码都是基于2009 年12 月发布的ECMAScript 5(即ES5,其中的ES 是ECMAScript 的简称)。ECMAScript 2015(ES2015)在2015 年6 月标准化,距离它的上个版本过去了近6 年。在ES2015 发布前,ES6 的名字已经变得流行了。 负责起草ECMAScript 规范的委员会决定把定义新标准的模式改为每年更新一...
Intensive reading "Typescript 4.5-4.6 New Features" Added Awaited type Awaited can extract the actual return type of Promise. According to the name, it can be understood as: waiting for the type obtained after the Promise resolves. The following is the Demo provided by the official ...