Exploring angular 2 has led me to create a TypeScript definition for a truncate method that I plan to implement in one of my services.
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);
};
Seeking guidance on how to import this into another TypeScript module or make it globally accessible.
In my Ionic 3 Angular 4 application, I decided to enhance the functionality of strings by creating a file named stringExtensions.ts.
export { } // Exporting as a module
declare global { // Enables access to the global type String
interface String {
truncate(max: number, decorator: string): string;
}
}
// The custom code implementation
String.prototype.truncate = function(max, decorator){
decorator = decorator || '...';
return (this.length > max ? this.substring(0,max)+decorator : this);
};
Is there a way to incorporate this functionality into another typescript module or make it accessible globally?
To achieve this, create a new file called 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);
};
Next step is to import the file as follows:
import "./stringExtensions"
https://basarat.gitbooks.io/typescript/content/docs/types/lib.d.ts.html
For me, when working with TypeScript version 2.3.4, I utilized the following:
declare global {
interface Date {
format(format: string): string;
}
}
You can find more information on this topic in the TypeScript documentation under Augmenting global/module scope from modules
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