Illustrates how to define a generic object which can contain multiple value types

tstest.ts

interface PrimitivesObject {
  [key: string]: string | number;
}

function printPrimitives(data: PrimitivesObject) {
  Object.entries(data).forEach(entry => console.log(`Key: ${entry[0]}, Value: ${entry[1]}`));
}

printPrimitives({
  a: 1,
  b: 'string',
});