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-rw-r--r--compiler/condsyms.nim1
-rw-r--r--compiler/jsgen.nim5
2 files changed, 5 insertions, 1 deletions
diff --git a/compiler/condsyms.nim b/compiler/condsyms.nim
index 131f32f32..55f2b4a0f 100644
--- a/compiler/condsyms.nim
+++ b/compiler/condsyms.nim
@@ -123,3 +123,4 @@ proc initDefines*(symbols: StringTableRef) =
   defineSymbol("nimHasEffectTraitsModule")
   defineSymbol("nimHasCastPragmaBlocks")
   defineSymbol("nimHasDeclaredLocs")
+  defineSymbol("nimHasJsBigIntBackend")
diff --git a/compiler/jsgen.nim b/compiler/jsgen.nim
index 675a24c92..4b369210d 100644
--- a/compiler/jsgen.nim
+++ b/compiler/jsgen.nim
@@ -1677,7 +1677,10 @@ proc createVar(p: PProc, typ: PType, indirect: bool): Rope =
   var t = skipTypes(typ, abstractInst)
   case t.kind
   of tyInt..tyInt64, tyUInt..tyUInt64, tyEnum, tyChar:
-    result = putToSeq("0", indirect)
+    if $t.sym.loc.r == "bigint":
+      result = putToSeq("0n", indirect)
+    else:
+      result = putToSeq("0", indirect)
   of tyFloat..tyFloat128:
     result = putToSeq("0.0", indirect)
   of tyRange, tyGenericInst, tyAlias, tySink, tyOwned: