[英]how to include a prototype in typescript
I am learning angular 2 and I have written a ts definition for a truncate method I want to use in one of my services. 我正在学习角度2,我已经为我想要在我的一个服务中使用的truncate方法编写了一个ts定义。
truncate.ts truncate.ts
interface String {
truncate(max: number, decorator: string): string;
}
String.prototype.truncate = function(max, decorator){
decorator = decorator || '...';
return (this.length > max ? this.substring(0,max)+decorator : this);
};
How do I import this into another typescript module or at least make it available to use globally. 如何将其导入另一个打字稿模块或至少使其可以全局使用。
How do I import this into another typescript module or at least make it available to use globally. 如何将其导入另一个打字稿模块或至少使其可以全局使用。
Move it to a file stringExtenions.ts
: 将其移动到文件stringExtenions.ts
:
interface String {
truncate(max: number, decorator: string): string;
}
String.prototype.truncate = function(max, decorator){
decorator = decorator || '...';
return (this.length > max ? this.substring(0,max)+decorator : this);
};
And import the file like: 并导入文件,如:
import "./stringExtensions"
https://basarat.gitbooks.io/typescript/content/docs/types/lib.d.ts.html https://basarat.gitbooks.io/typescript/content/docs/types/lib.d.ts.html
using typescript 2.3.4 in an Ionic 3 Angular 4 app I create a file called stringExtensions.ts and put this in it 在Ionic 3 Angular 4应用程序中使用typescript 2.3.4我创建一个名为stringExtensions.ts的文件并将其放入其中
export { } // to make it a module
declare global { // to access the global type String
interface String {
truncate(max: number, decorator: string): string;
}
}
// then the actual code
String.prototype.truncate = function(max, decorator){
decorator = decorator || '...';
return (this.length > max ? this.substring(0,max)+decorator : this);
};
In my case TypeScript 2.3.4, use 在我的案例TypeScript 2.3.4中,使用
declare global {
interface Date {
format(format: string): string;
}
}
The TypeScript document Augmenting global/module scope from modules TypeScript文档从模块扩充全局/模块范围
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