可空返回类型的正确 JSDoc 语法？

Question

With Javascript function JSDocs, I've seen two different syntaxes for documenting the return values that can be nullable.

Let's say we have this function:

const getTitle = () => { // Can return string or null };

For this, which of the following JSDocs is correct:

1. @returns {?string}
2. @returns [string]
3. Something else?

Answer 1

您可以通过两种方式执行此操作，首选第一种方式：

@returns {?string}

@returns {string|null}