cli: disable parsing of input source maps in tests

Signed-off-by: Patrik Oldsberg <poldsberg@gmail.com>

.changeset/ten-apes-turn.md

@@ -0,0 +1,5 @@
+---
+'@backstage/cli': patch
+---
+
+Disabled parsing of input source maps in the SWC transform for Jest.

packages/cli/config/jestSwcTransform.js

@@ -18,7 +18,10 @@ const { createTransformer: createSwcTransformer } = require('@swc/jest');
 const ESM_REGEX = /\b(?:import|export)\b/;
 
 function createTransformer(config) {
-  const swcTransformer = createSwcTransformer(config);
+  const swcTransformer = createSwcTransformer({
+    inputSourceMap: false,
+    ...config,
+  });
   const process = (source, filePath, jestOptions) => {
     if (filePath.endsWith('.js') && !ESM_REGEX.test(source)) {
       return { code: source };