grafana/public/app/plugins/panel/geomap/utils/selection.ts

import { SelectableValue } from '@grafana/data';

export interface SelectionInfo<T> {
  options: Array<SelectableValue<T>>;
  current?: SelectableValue<T>;
}

/**
 * The select component is really annoying -- if the current value is not in the list of options
 * it won't show up.  This is a wrapper to make that happen.
 */
export function getSelectionInfo<T>(v?: T, options?: Array<SelectableValue<T>>): SelectionInfo<T> {
  if (v && !options) {
    const current = { label: `${v}`, value: v };
    return { options: [current], current };
  }
  if (!options) {
    options = [];
  }
  let current = options.find((item) => item.value === v);

  if (v && !current) {
    current = {
      label: `${v} (not found)`,
      value: v,
    };
    options.push(current);
  }
  return {
    options,
    current,
  };
}