From 044ddedc404835c31b36fa49765ff3d07d6181a7 Mon Sep 17 00:00:00 2001
From: Mattia Manzati <mattia.manzati@gmail.com>
Date: Sat, 11 Jul 2026 08:55:11 +0200
Subject: [PATCH] Speed up diagnostics tests

---
 .changeset/fast-diagnostics-tests.md               | 5 +++++
 packages/language-service/test/diagnostics.test.ts | 1 +
 2 files changed, 6 insertions(+)
 create mode 100644 .changeset/fast-diagnostics-tests.md

diff --git a/.changeset/fast-diagnostics-tests.md b/.changeset/fast-diagnostics-tests.md
new file mode 100644
index 00000000..009c35ff
--- /dev/null
+++ b/.changeset/fast-diagnostics-tests.md
@@ -0,0 +1,5 @@
+---
+"@effect/language-service": patch
+---
+
+Enable `skipLibCheck` in the diagnostics test harness to reduce test runtime and memory usage.
diff --git a/packages/language-service/test/diagnostics.test.ts b/packages/language-service/test/diagnostics.test.ts
index de079eba..8f85908c 100644
--- a/packages/language-service/test/diagnostics.test.ts
+++ b/packages/language-service/test/diagnostics.test.ts
@@ -27,6 +27,7 @@ const getExamplesDiagnosticsDir = () => getExamplesSubdir("diagnostics")
 
 function compilerOptionsFromSourceComment(sourceText: string): ts.CompilerOptions {
   return {
+    skipLibCheck: true,
     ...(sourceText.includes("// @strict") ? { strict: true } : {})
   }
 }