What does this TypeScript snippet output?

Console output

Why

The logical OR `||` falls back on any falsy value, so the empty string triggers `"A"`. The nullish `??` falls back only on `null`/`undefined`, so the empty string passes through unchanged. The output is `A` followed by a space and then nothing: the typed `string` value `""` is preserved by `??`. This is the canonical reason to prefer `??` for defaults when empty strings or `0` are valid.