comments

typescript/core/src/ChunkCursor.ts

@@ -38,6 +38,16 @@ export class ChunkCursor {
     this.#startTime = params.startTime;
     this.#endTime = params.endTime;
     this.#reverse = params.reverse;
+
+    if (this.chunkIndex.messageIndexLength === 0n) {
+      // Chunk has no message indexes.
+      // We only allow that if the chunk has no messages and the start and end times are 0.
+      if (this.chunkIndex.messageStartTime !== 0n || this.chunkIndex.messageEndTime !== 0n) {
+        throw new Error(
+          `Encountered a chunk index without message indexes and non-zero start and end times`,
+        );
+      }
+    }
   }
 
   /**
@@ -104,16 +114,6 @@ export class ChunkCursor {
     let messageIndexStartOffset: bigint | undefined;
     let relevantMessageIndexStartOffset: bigint | undefined;
 
-    if (this.chunkIndex.messageIndexLength === 0n) {
-      // Chunk has no message indexes.
-      // We only allow that if the chunk has no messages and the start and end times are 0.
-      if (this.chunkIndex.messageStartTime !== 0n || this.chunkIndex.messageEndTime !== 0n) {
-        throw new Error(
-          `Encountered a chunk index without message indexes and non-zero start and end times`,
-        );
-      }
-    }
-
     for (const [channelId, offset] of this.chunkIndex.messageIndexOffsets) {
       if (messageIndexStartOffset == undefined || offset < messageIndexStartOffset) {
         messageIndexStartOffset = offset;