RemoteDocumentCache APIs for Indexing (#5988)

Author: schmidt-sebastian

.changeset/seven-dolphins-breathe.md

@@ -0,0 +1,5 @@
+---
+"@firebase/firestore": patch
+---
+
+The format of some of the IndexedDB data changed. This increases the performance of document lookups after an initial migration. If you do not want to migrate data, you can call `clearIndexedDbPersistence()` before invoking `enableIndexedDbPersistence()`.

packages/firestore/externs.json

@@ -34,6 +34,7 @@
     "packages/firestore/src/protos/firestore_proto_api.ts",
     "packages/firestore/src/util/error.ts",
     "packages/firestore/src/local/indexeddb_schema.ts",
+    "packages/firestore/src/local/indexeddb_schema_legacy.ts",
     "packages/firestore/src/local/shared_client_state_schema.ts"
   ]
 }

packages/firestore/src/core/snapshot_version.ts

@@ -30,6 +30,10 @@ export class SnapshotVersion {
     return new SnapshotVersion(new Timestamp(0, 0));
   }
 
+  static max(): SnapshotVersion {
+    return new SnapshotVersion(new Timestamp(253402300799, 1e9 - 1));
+  }
+
   private constructor(private timestamp: Timestamp) {}
 
   compareTo(other: SnapshotVersion): number {

packages/firestore/src/local/indexeddb_mutation_batch_impl.ts

@@ -23,6 +23,7 @@ import {
   DbMutationBatch,
   DbRemoteDocument
 } from './indexeddb_schema';
+import { DbRemoteDocument as DbRemoteDocumentLegacy } from './indexeddb_schema_legacy';
 import {
   DbDocumentMutationKey,
   DbDocumentMutationStore,
@@ -84,7 +85,9 @@ export function removeMutationBatch(
 /**
  * Returns an approximate size for the given document.
  */
-export function dbDocumentSize(doc: DbRemoteDocument | null): number {
+export function dbDocumentSize(
+  doc: DbRemoteDocument | DbRemoteDocumentLegacy | null
+): number {
   if (!doc) {
     return 0;
   }