Function testArray

lib/is-exact/index.test.ts:4–46

()

import { IsExact as Exact, isExact } from "..";

function testArray() {
  const readonlyArray: readonly number[] = [1, 2, 3];
  const writableArray: number[] = [1, 2, 3];
  const tuple: [number] = [1];
  const readonlyTuple = [1, 2, 3] as const;

  const isReadonlyArray = isExact<readonly number[]>();
  const isWritableArray = isExact<number[]>();
  const isTuple = isExact<[number]>();
  const isReadonlyTuple = isExact<readonly [1, 2, 3]>();

  isReadonlyArray(readonlyArray);
  // @ts-expect-error: doesn't have `readonly`
  isReadonlyArray(writableArray);
  // @ts-expect-error: doesn't have `readonly` and is tuple
  isReadonlyArray(tuple);
  // @ts-expect-error: is tuple
  isReadonlyArray(readonlyTuple);

  // @ts-expect-error: has `readonly`
  isWritableArray(readonlyArray);
  isWritableArray(writableArray);
  // @ts-expect-error: is tuple
  isWritableArray(tuple);
  // @ts-expect-error: has `readonly` and is tuple
  isWritableArray(readonlyTuple);

  // @ts-expect-error: has `readonly` and isn't tuple
  isTuple(readonlyArray);
  // @ts-expect-error: isn't tuple
  isTuple(writableArray);
  isTuple(tuple);
  // @ts-expect-error: has `readonly`
  isTuple(readonlyTuple);

  // @ts-expect-error: isn't tuple
  isReadonlyTuple(readonlyArray);
  // @ts-expect-error: has NO `readonly` and isn't tuple
  isReadonlyTuple(writableArray);
  // @ts-expect-error: has NO `readonly`
  isReadonlyTuple(tuple);
  isReadonlyTuple(readonlyTuple);
}

function testObjects() {
  type ABC = { a: number; b: number; c: number };