Convert the interface of a class into another interface clients expect. An adapter lets class work together that couldn't otherwise because of incompatible interfaces.

TypeScript Adapter Pattern Example

export class Adaptee {
    public method(): void {
        console.log("`method` of Adaptee is being called");
    }
}

export interface Target {
    call(): void;
}

export class Adapter implements Target {
    public call(): void {
        console.log("Adapter's `call` method is being called");
        var adaptee: Adaptee = new Adaptee();
        adaptee.method();
    }
}

export class Demo {

    show(): void {
        var adapter: Adapter = new Adapter();
        adapter.call();
    }
}


let demo = new Demo();
demo.show();

Run and Output

PS C:\design_patterns_in_typescript-master\adapter> tsc .\adapter.ts
PS C:\design_patterns_in_typescript-master\adapter> node .\adapter.js
Adapter's `call` method is being called
`method` of Adaptee is being called

Check out nice example at https://gist.github.com/joelpalmer/2baa8d3f2312be80fc074eeeb53b1ce7.