TypeScript is not recognized when you invoke a method that you assign inside the Constructor of TypeScript is not recognized.

class Block{
    // // Implements about block. internal.
    blockProperties: Object;

    constructor(){
        this.applyBlockPrototype();
    }

    applyBlockPrototype(): void{
        this.blockProperties = new Object();
    }
}

class Block{
    // // Implements about block. internal.
    blockProperties: Object;

    constructor(){
        this.blockProperties = new Object();
    }
}