From d0abd399af34b1f4815d43a028636a1c6c532e5f Mon Sep 17 00:00:00 2001
From: IllusionMH <illusionmh@gmail.com>
Date: Thu, 27 Sep 2018 01:42:13 +0300
Subject: [PATCH] Use safe some function to handle undefined declarations
 (fixes #27338)

---
 src/services/completions.ts | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/services/completions.ts b/src/services/completions.ts
index 30331746d1..afadbf64f4 100644
--- a/src/services/completions.ts
+++ b/src/services/completions.ts
@@ -1397,7 +1397,7 @@ namespace ts.Completions {
                 if (resolvedModuleSymbol !== moduleSymbol &&
                     // Don't add another completion for `export =` of a symbol that's already global.
                     // So in `declare namespace foo {} declare module "foo" { export = foo; }`, there will just be the global completion for `foo`.
-                    resolvedModuleSymbol.declarations.some(d => !!d.getSourceFile().externalModuleIndicator)) {
+                    some(resolvedModuleSymbol.declarations, d => !!d.getSourceFile().externalModuleIndicator)) {
                     symbols.push(resolvedModuleSymbol);
                     symbolToOriginInfoMap[getSymbolId(resolvedModuleSymbol)] = { kind: SymbolOriginInfoKind.Export, moduleSymbol, isDefaultExport: false };
                 }