@angular/fire/esm2015/compat/database/list/audit-trail.js

The official Angular library for Firebase.

import { stateChanges } from './state-changes';
import { fromRef } from '../observable/fromRef';
import { map, scan, skipWhile, withLatestFrom } from 'rxjs/operators';
export function auditTrail(query, events, scheduler) {
    const auditTrail$ = stateChanges(query, events)
        .pipe(scan((current, action) => [...current, action], []));
    return waitForLoaded(query, auditTrail$, scheduler);
}
function loadedData(query, scheduler) {
    // Create an observable of loaded values to retrieve the
    // known dataset. This will allow us to know what key to
    // emit the "whole" array at when listening for child events.
    return fromRef(query, 'value', 'on', scheduler)
        .pipe(map(data => {
        // Store the last key in the data set
        let lastKeyToLoad;
        // Loop through loaded dataset to find the last key
        data.payload.forEach(child => {
            lastKeyToLoad = child.key;
            return false;
        });
        // return data set and the current last key loaded
        return { data, lastKeyToLoad };
    }));
}
function waitForLoaded(query, action$, scheduler) {
    const loaded$ = loadedData(query, scheduler);
    return loaded$
        .pipe(withLatestFrom(action$), 
    // Get the latest values from the "loaded" and "child" datasets
    // We can use both datasets to form an array of the latest values.
    map(([loaded, actions]) => {
        // Store the last key in the data set
        const lastKeyToLoad = loaded.lastKeyToLoad;
        // Store all child keys loaded at this point
        const loadedKeys = actions.map(snap => snap.key);
        return { actions, lastKeyToLoad, loadedKeys };
    }), 
    // This is the magical part, only emit when the last load key
    // in the dataset has been loaded by a child event. At this point
    // we can assume the dataset is "whole".
    skipWhile(meta => meta.loadedKeys.indexOf(meta.lastKeyToLoad) === -1), 
    // Pluck off the meta data because the user only cares
    // to iterate through the snapshots
    map(meta => meta.actions));
}
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