All files / projects-dev/libs/patterns/src singleton.ts

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export class Singleton {
    public static getInstance(): Singleton {
        if (Singleton.instance === undefined) {
            Singleton.instance = new Singleton();
        }
 
        return Singleton.instance;
    }
 
    private static instance: Singleton;
 
    private constructor() {
        // nothing to do yet
    }
}