fixing the start coord to avoid negative numbers

scottcain · Nov 25, 2024 · 9f94ad2 · 9f94ad2
1 parent 3b1fef3
commit 9f94ad2
Showing 1 changed file with 1 addition and 1 deletion.
diff --git a/lib/src/accessFasta.ts b/lib/src/accessFasta.ts
@@ -17,7 +17,7 @@ export async function accessFasta(
     gzi: gziFilehandle,
   });
 
-  const upstreamstart = start - 499;
+  const upstreamstart = start - 499 < 0 ? 0 : start - 499;
   const downstreamend = end + 499;
   const seq = await t.getSequence(refseq, start, end);
   const upstream = await t.getSequence(refseq, upstreamstart, start);