fix coverage sourcemap

Author: ajaishankar

jest.config.js

@@ -2,4 +2,11 @@ module.exports = {
   preset: 'ts-jest',
   testEnvironment: 'jsdom',
   modulePathIgnorePatterns: ['dist'],
+  globals: {
+    'ts-jest': {
+      tsconfig: {
+        sourceMap: true,
+      },
+    },
+  },
 }