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export type SummableItem = string | number;
/** * @param toSum A list with numbers or/and strings to sum. * * @example * ```typescript * import {sum} from "https://deno.land/x/sum/mod.ts" * * sum([1, 2, 3, 4, 5]) //=> 15 * sum(["1", "2", "3", "4", "5"]) //=> "12345" * ``` */export function sum(toSum: SummableItem[]): SummableItem {  return toSum.reduce((a, b) =>    typeof a === "number" && typeof b === "number" ? a + b : `${a}${b}`  );}