will fix invalid path resolution in non-unix OS

please keep in mind you also have Windows users :)

Author: r4nd0m

lib/module-name-mapper-helper.js

@@ -11,7 +11,7 @@ const matchModuleImport = /^[^?]*~/
 function resolve(to, importPath, fileType) {
   importPath =
     path.extname(importPath) === '' ? `${importPath}.${fileType}` : importPath
-  if (importPath.startsWith('/')) {
+  if (path.isAbsolute(importPath)) {
     return importPath
   } else if (matchModuleImport.test(importPath)) {
     return require.resolve(importPath.replace(matchModuleImport, ''))