What causes the error message when attempting to assign an argument of type 'any[]' to a parameter expecting type 'never'?

I encountered the following error in this code:

Argument of type 'any[]' is not assignable to parameter of type 'never'

var markers: [];
this.Getlapoints(this.map.getCenter(), 500000).then(data => {
  for (var key in data) {
    Leaflet.marker(data[key].location, //{ icon: greenIcon            }
    ).addTo(this.map).bindPopup(data[key].caption);
    // markers.push(data[key].location.lat,data[key].location.lng);
    // markers.push(data[key].location);

    var lat = data[key].location.lat;
    var lng = data[key].location.lng;
    markers.push([lat, lng]);
  }
  console.log(markers);
});

Answer №1

Modify the following code snippet:

const a = [];

To this one:

const a = Array();

Answer №2

When using var markers: [], you are essentially declaring the markers array as constantly empty. You most likely intended to use var markers = [] in order to initialize it as empty but still be able to add items.

Answer №4

The concept of the never type in TypeScript is quite unique and interesting. It is considered a subtype of every other type, but no other type can be a subtype of it, except for never itself. Surprisingly, even the union type any is not assignable to never.

Source: Check out more about the never type in the official TypeScript documentation

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