gistfile1.ts

// Layer interface
interface Layer {
    search: (str: string)=>void;
}

// File Controller.js
function search(str) {
    var layers: Layer[] = getAllActiveLayers();
    layers.forEach(function(layer) {
        layer.search(str);
    });
}



// File MpdLayer.js
class MpdLayer implements Layer {
    public search(str: string) {
        // run search str
    }
}

// File SpopLayer.js
class SpopLayer implements Layer {
    public search(str: string) {
        // run search str
    }
}

// File GoogleLayer.js
class GoogleLayer implements Layer {
    public search(str: string) {
        // run search str
    }
}