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

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]);
//                                                       ^^^^^

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.

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