ts-data-forge/src/guard/key-is-in.test.mts

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import { keyIsIn } from './key-is-in.mjs';

const f = <Key extends string, V, KeySub extends Key>(
  key: Key,
  obj: ReadonlyRecord<KeySub, V>,
): V | undefined => (keyIsIn(key, obj) ? obj[key] : undefined);

describe(keyIsIn, () => {
  f('a' as 'a' | 'b' | 'c', { a: 0, b: 1 });

  test('', () => {
    assert.isTrue(
      keyIsIn('a', {
        a: 0,
        b: 1,
      }),
    );
  });
});