From 47bb090ded993d7105faca7e9953415fdeff1aad Mon Sep 17 00:00:00 2001
From: Jake Bailey <5341706+jakebailey@users.noreply.github.com>
Date: Wed, 19 Jun 2024 11:34:52 -0700
Subject: [PATCH] Defer creation of barebonesLibSourceFile (#58931)

Co-authored-by: Titian Cernicova-Dragomir <tcernicovad1@bloomberg.net>
---
 src/services/transpile.ts | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/src/services/transpile.ts b/src/services/transpile.ts
index ccf8396247c..86622ea3e35 100644
--- a/src/services/transpile.ts
+++ b/src/services/transpile.ts
@@ -26,6 +26,7 @@ import {
     optionDeclarations,
     parseCustomTypeOption,
     ScriptTarget,
+    SourceFile,
     toPath,
     transpileOptionValueCompilerOptions,
 } from "./_namespaces/ts.js";
@@ -109,9 +110,11 @@ interface Symbol {
     readonly [Symbol.toStringTag]: string;
 }`;
 const barebonesLibName = "lib.d.ts";
-const barebonesLibSourceFile = createSourceFile(barebonesLibName, barebonesLibContent, { languageVersion: ScriptTarget.Latest });
+let barebonesLibSourceFile: SourceFile | undefined;
 
 function transpileWorker(input: string, transpileOptions: TranspileOptions, declaration?: boolean): TranspileOutput {
+    barebonesLibSourceFile ??= createSourceFile(barebonesLibName, barebonesLibContent, { languageVersion: ScriptTarget.Latest });
+
     const diagnostics: Diagnostic[] = [];
 
     const options: CompilerOptions = transpileOptions.compilerOptions ? fixupCompilerOptions(transpileOptions.compilerOptions, diagnostics) : {};