TypeScript Interfaces Class Interface
Example
Declare public variables and methods type in the interface to define how other typescript code can interact with it.
interface ISampleClassInterface {
sampleVariable: string;
sampleMethod(): void;
optionalVariable?: string;
}
Here we create a class that implements the interface.
class SampleClass implements ISampleClassInterface {
public sampleVariable: string;
private answerToLifeTheUniverseAndEverything: number;
constructor() {
this.sampleVariable = 'string value';
this.answerToLifeTheUniverseAndEverything = 42;
}
public sampleMethod(): void {
// do nothing
}
private answer(q: any): number {
return this.answerToLifeTheUniverseAndEverything;
}
}
The example shows how to create an interface ISampleClassInterface and a class SampleClass that implements the interface.
