从文件A中导出接口,例如export interface Employee {}。 将文件B中的接口导入为import { Employee } from './another-file'。 使用文件B中的界面。 下面是从名为another-file.ts的文件中导出接口的示例。 another-file.ts // 👇️ named exportexportint
(occupation == "Programmer") return new Programmer(firstName, lastName); else if (occupation == "Manager") return new Manager(firstName, lastName); else return new NormalPerson(firstName, lastName); } export interface Person { firstName: string; lastName: string; ...
we have reused the TypeScript Interface as a type on both the user and user2. As is evident from the code snippet above, first of all, we are ending up writing much less code, and second, we are getting almost the same errors. ...
AI代码解释 interfaceClown{/*...*/}interfaceJoker{/*...*/}letStealersWheel:[...Clown[],"me",...Joker[]];// ~~~ Error!// A rest element cannot follow another rest element.letStringsAndMaybeBoolean:[...string[],boolean?];// ~~~ Error!// An optional element cannot follow a rest...
Another common confusion is to claim that the opposite program should be accepted: interfaceCanCheck{checkThing:(x:string|number)=>boolean;}constobj={checkThing:(s:string)=>{returntrue;}}objsatisfiesCanCheck;// Alleged: should be OK
If you reject this suggestion, you can rename the file at any time later using the Rename file... intention action. This is useful if you have just created a new file but then came up with a better name when started typing a class or interface in it. Another intention action suggests...
exportinterfaceOptions{// ...}declarefunctiondoSomething(options:Options):void;export=doSomething;// ^^^// Error: An export assignment cannot be used in a module with other exported elements. To fix this, move the types inside a namespace with the same name as the function: declarenamespace...
interface String { fancyFormat(opts?: StringFormatOptions): string; } } // Somewhere in a file far, far away... String.fancyFormat(); // no error! 1. 2. 3. 4. 5. 6. 7. 8. 9. 解决这个问题的方法显而易见:使用显示依赖而不是全局状态栈。TypeScript 很早以前就为 ECMAScript 导入和...
If you choose one of the suggestions from another file or module, VS Code will automatically add an import for it. In this example, VS Code adds an import forHerculesto the top of the file: You can disable auto imports by setting"typescript.suggest.autoImports": false. ...
TypeScript also offers indexed types, which provide another way to define key-value structures: // Indexed type interface IndexedUser { [key: string]: { age: number, active: boolean }; } type RecordUser = Record<string, { age: number, active: boolean }>; Index signature offers more flex...