app.ts

import xs from 'xstream';
import {run} from '@cycle/xstream-run';
import {makeDOMDriver, h1} from '@cycle/dom';

function main(sources: any) {
  const sinks = {
    DOM: xs.periodic(1000).map(i =>
      h1('' + i + ' seconds elapsed'))
    };
    return sinks;
}

// Fix: { Add [name:string]: Function }
const drivers: { [name:string]: Function } = {
    'DOM': makeDOMDriver('#app')
};

run(main, drivers);

ERROR in ./src/app.ts
(18,11): error TS2345: Argument of type '{ 'DOM': Function; }' is not assignable to parameter of type '{ [name: string]: Function; }'.
Index signature is missing in type '{ 'DOM': Function; }'.