From d983e791e187963ff1583569a875f1eb0d166cbf Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Nacho=20Codo=C3=B1er?= <igcogi@gmail.com>
Date: Mon, 26 May 2025 16:16:58 +0200
Subject: [PATCH] refactor extend babel options

---
 packages/babel-compiler/babel-compiler.js | 42 +++++++++++++++++------
 1 file changed, 32 insertions(+), 10 deletions(-)

diff --git a/packages/babel-compiler/babel-compiler.js b/packages/babel-compiler/babel-compiler.js
index bfc45c5758..1c49ac6711 100644
--- a/packages/babel-compiler/babel-compiler.js
+++ b/packages/babel-compiler/babel-compiler.js
@@ -304,22 +304,33 @@ BCp.processOneFileForTarget = function (inputFile, source) {
       },
     };
 
-    this.inferTypeScriptConfig(features, inputFile, cacheOptions.cacheDeps);
+    // Helper function to setup Babel options
+    const setupBabelOptions = () => {
+      this.inferTypeScriptConfig(features, inputFile, cacheOptions.cacheDeps);
 
-    var babelOptions = Babel.getDefaultOptions(features);
-    babelOptions.caller = { name: "meteor", arch };
+      var babelOptions = Babel.getDefaultOptions(features);
+      babelOptions.caller = { name: "meteor", arch };
 
-    this.inferExtraBabelOptions(inputFile, babelOptions, cacheOptions.cacheDeps);
+      babelOptions.sourceMaps = true;
+      const filename = packageName
+          ? `packages/${packageName}/${inputFilePath}`
+          : inputFilePath;
+      babelOptions.filename = babelOptions.sourceFileName = filename;
 
-    babelOptions.sourceMaps = true;
+      this.inferExtraBabelOptions(inputFile, babelOptions, cacheOptions.cacheDeps);
+
+      if (this.modifyBabelConfig) {
+        this.modifyBabelConfig(babelOptions, inputFile);
+      }
+
+      return babelOptions;
+    };
+
+    // Define babelOptions at the outer scope so it's available for source map
+    var babelOptions;
     const filename = packageName
         ? `packages/${packageName}/${inputFilePath}`
         : inputFilePath;
-    babelOptions.filename = babelOptions.sourceFileName = filename;
-
-    if (this.modifyBabelConfig) {
-      this.modifyBabelConfig(babelOptions, inputFile);
-    }
 
     try {
       var result = (() => {
@@ -384,6 +395,8 @@ BCp.processOneFileForTarget = function (inputFile, source) {
                   arch,
                 });
               }
+              // Set babelOptions.filename for source map
+              babelOptions = { filename };
               return compilation;
             }
 
@@ -396,7 +409,12 @@ BCp.processOneFileForTarget = function (inputFile, source) {
             // Save result in cache
             this.writeToSwcCache({ cacheKey, compilation });
             usedSwc = true;
+            // Set babelOptions.filename for source map
+            babelOptions = { filename };
           } else {
+            // Set up Babel options only when compiling with Babel
+            babelOptions = setupBabelOptions();
+
             compilation = compileWithBabel(source, babelOptions, cacheOptions);
             usedSwc = false;
           }
@@ -414,6 +432,10 @@ BCp.processOneFileForTarget = function (inputFile, source) {
         } catch (e) {
           this._swcIncompatible[cacheKey] = true;
           // If SWC fails, fall back to Babel
+
+          // Set up Babel options for fallback
+          babelOptions = setupBabelOptions();
+
           compilation = compileWithBabel(source, babelOptions, cacheOptions);
           if (config?.verbose) {
             logTranspilation({