> Le 5 sept. 2019 à 23:39, Andrea Giammarchi <[email protected]> a
> écrit :
>
> This is basically a solution to a common problem we have these days, where
> modules published in the wild might have a `default` property, to support ESM
> logic, or not.
>
> ```js
> // current optional chaining logic
> const imported = exported?.default ?? exported;
>
> // my "mice operator" proposal
> const imported = exported<?.default;
> ```
>
The semantics of the `?.` in `exported?.default` is not to check whether the
`default` property exists, but whether `exported` evaluates to undefined or
null. If the `default` property is absent, `exported.default` has always
evaluated to `undefined`, and there is no need to optional chaining operator.
So that I guess you actually meant:
``js
const imported = exported.default ?? exported;
```
—Claude
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