How to use the fast-json-patch/index.mjs.applyPatch function in fast-json-patch

validateAndApplySequence(tree, sequence) {
        try {
            // we don't want this changes to generate patches since they originate from server, not client
            this.unobserve();
            const results = applyPatch(tree, sequence, this.debug);
            // notifications have to happen only where observe has been re-enabled
            // otherwise some listener might produce changes that would go unnoticed
            this.observe();
            // the state was fully replaced
            if (results.newDocument !== tree) {
                // object was reset, proxify it again
                this.prepareProxifiedObject(results.newDocument);

                this.queue.obj = this.obj;

                // validate json response
                findRangeErrors(this.obj, this.onIncomingPatchValidationError);
                // Catch errors in onStateReset
                try {
                    this.onStateReset(this.obj);
                } catch (error) {