LocalDocument Observer field error

[LeTienHanh]

I using observer for LocalDocument with your example:

await myCollection.upsertLocal(
    'foobar',   // id
    {           // data
        foo: 'bar'
    }
);
localDoc = await myCollection.getLocal('foobar');
localDoc.get$('foo').subscribe(value => { /* .. */ });

But the error raise:

Uncaught (in promise) TypeError: this._dataSync$.map is not a function
    at RxLocalDocument.get$ (local-documents.js:135)

Please help me check this problem because my project face with refactor all with this problem.
Thank you very much.

[pubkey]

This is a bug at this line. .map() should be imported used in a rxjs-pipe. PR welcomed :)