The has() method of the "PreviewCache" class probably won't work

[sounisi5011]

The has() method should verify whether the cache data corresponding to the url specified in the argument exists.
However, the code when using the flat-cache package is probably not in line with its purpose.

See line 47:

metalsmith-netlify-published-date/src/cache/preview.ts

Lines 43 to 49 in c77a135

	public has(url: string): boolean {
	if (this._store instanceof Map) {
	return this._store.has(url);
	} else {
	return this.isCachedPreviewResponseJSON(this._store.all().url);
	}
	}

This code always looks like reading the cached data stored in the url property.

Is the correct code not this? :

return this.isCachedPreviewResponseJSON(this._store.all()[url]);
//                                                       ^^^^^

[sounisi5011]

Thank you for pointing out important issues!
Perhaps I wrote this code while sleeping 💦

Fortunately, we do not use the PreviewCache class has() method at now.
has() method was added to make it work as a Map class compatible interface.

However, this bug may cause problems if you use the has() method in the future.
This project requires test code of PreviewCache class.