// https://tc39.es/ecma262/multipage/indexed-collections.html#sec-array.prototype.at // Technically the specs also allow non-numeric types to be passed as index. // However, TypeScript types the `Array.at` index param as number so we also expect only numbers // This behaviour also matches the implementation of other Array functions in lualib. export function __TS__ArrayAt(this: T[], relativeIndex: number): T | undefined { const absoluteIndex = relativeIndex < 0 ? this.length + relativeIndex : relativeIndex; if (absoluteIndex >= 0 && absoluteIndex < this.length) { return this[absoluteIndex]; } return undefined; }