// @strict: true

interface NumList {
  kind: 'n';
  [x: number]: number;
}
interface StrList {
  kind: 's';
  [x: number]: string;
}

export function foo<T extends NumList | StrList>(arr: T & (NumList | StrList)) {
  let zz = arr[1];  // Error
}

// Repro from #38102

export type TypedArray = Int32Array | Uint8Array;

export function isTypedArray(a: {}): a is Int32Array | Uint8Array {
  return a instanceof Int32Array || a instanceof Uint8Array;
}

export function flatten<T extends number|TypedArray>(arr: T) {
  if (isTypedArray(arr)) {
      arr[1];
  }
}