From 540fe5fe91ad7d1facd02455dbe26360134086ac Mon Sep 17 00:00:00 2001
From: Wesley Wigham <wewigham@microsoft.com>
Date: Tue, 16 Nov 2021 12:13:09 -0800
Subject: [PATCH] Allow nightly-only flags in `-insiders` builds

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

diff --git a/src/compiler/program.ts b/src/compiler/program.ts
index c29876ce619f5..24552703308ff 100644
--- a/src/compiler/program.ts
+++ b/src/compiler/program.ts
@@ -3160,7 +3160,7 @@ namespace ts {
         }
 
         function verifyCompilerOptions() {
-            const isNightly = stringContains(version, "-dev");
+            const isNightly = stringContains(version, "-dev") || stringContains(version, "-insiders");
             if (!isNightly) {
                 if (getEmitModuleKind(options) === ModuleKind.Node12) {
                     createOptionValueDiagnostic("module", Diagnostics.Compiler_option_0_of_value_1_is_unstable_Use_nightly_TypeScript_to_silence_this_error_Try_updating_with_npm_install_D_typescript_next, "module", "node12");