firestore-snapshot-utils/dist/getDBSnapshotChangesDiff.js

**Utils for testing Firestore DB snapshots**

const TextLine = '--------------------------------';
/**
 * Returns a string with the differences between two snapshots of a Firestore
 * database.
 */
export const getDiffFromDBSnapshotChanges = (changes) => {
    const results = [];
    if (changes.added.length > 0) {
        changes.added.forEach((snapshot) => {
            let text = snapshot.getDiff() ?? '';
            // Remove first line of text as it is not useful (only shows the object
            // removed)
            text = text.split('\n').slice(1).join('\n');
            text = `${TextLine}\n ADDED (path: ${snapshot.normalizedPath})\n${TextLine}\n${text}`;
            results.push(text);
        });
    }
    if (changes.removed.length > 0) {
        changes.removed.forEach((snapshot) => {
            let text = snapshot.getDiff() ?? '';
            // Remove first line of text as it is not useful (only shows the object
            // added)
            text = text.split('\n').slice(1).join('\n');
            text = `${TextLine}\n REMOVED (path: ${snapshot.normalizedPath})\n${TextLine}\n${text}`;
            results.push(text);
        });
    }
    if (changes.modified.length > 0) {
        changes.modified.forEach((snapshot) => {
            let text = snapshot.getDiff() ?? '';
            text = `${TextLine}\n MODIFIED (path: ${snapshot.normalizedPath})\n${TextLine}\n${text}`;
            results.push(text);
        });
    }
    // Sort results to keep the order consistent across runs
    return `DB DIFF\n\n${results.sort().join(`\n${TextLine}\n\n`)}`;
};