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Paginate data with query cursors | Firebase

`export const firestoreCollectionDocumentsJoin = (firestore: AngularFirestore, joins: Join[], clazz: any) => { return (source: Observable) => defer(() => { let documents: any[]; const cache = new Map(); return source.pipe( distinctUntilChanged((x, y) => { const x1 = x.filter((dca: DocumentChangeAction<unknown>) => {…

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