diff --git a/light9/web/patch.ts b/light9/web/patch.ts
--- a/light9/web/patch.ts
+++ b/light9/web/patch.ts
@@ -2,7 +2,6 @@ import * as async from "async";
 import debug from "debug";
 import * as N3 from "n3";
 import { NamedNode, Parser, Quad, Writer } from "n3";
-import { isEqualWith } from "lodash";
 
 export interface QuadPattern {
   subject: N3.Quad_Subject | null;
@@ -131,6 +130,7 @@ export class Patch {
 
     return this._allSubjsCache;
   }
+
   allPreds(): Set<NamedNode> {
     const ret = new Set<NamedNode>();
     for (let qq of [this.adds, this.dels]) {
@@ -143,6 +143,7 @@ export class Patch {
   }
 }
 
+// The schema of the json sent from graph server.
 export interface SyncgraphPatchMessage {
   patch: { adds: string; deletes: string };
 }
@@ -180,26 +181,3 @@ export function parseJsonPatch(input: Sy
   // todo: is it faster to run them in series? might be
   async.parallel([parseAdds, parseDels], (err: any) => cb(new Patch(dels, adds)));
 }
-
-// /** @deprecated replace with  p=p.update(p2) */
-// export function patchUpdate(p1: Patch, p2: Patch): void {
-//   throw "";
-// }
-
-// /** @deprecated replace with  p.summary() */
-// export function patchSizeSummary(patch: Patch) {
-//   throw "";
-// }
-
-// /** @deprecated moved to Patch.toJsonPatch */
-// export function toJsonPatch(jsPatch: Patch, cb: (jsonString: string) => void): void {
-//   throw "";
-// }
-// /** @deprecated moved to Patch.containsAnyPreds */
-// export function patchContainsPreds(patch: Patch, preds: NamedNode[]): boolean {
-//   throw "";
-// }
-// /** @deprecated moved to Patch.allSubjs */
-// export function allPatchSubjs(patch: Patch): Set<string> {
-//   throw "";
-// }