cli: remove old jest ESM transform

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

packages/cli/config/jestEsmTransform.js

@@ -1,36 +0,0 @@
-/*
- * Copyright 2020 The Backstage Authors
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- *     http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-
-const babel = require('@babel/core');
-
-// We build .esm.js files with plugin:build, so to be able to load these in tests they need to be transformed
-// TODO: jest is working on module support, it's possible that we can remove this in the future
-module.exports = {
-  process(src) {
-    const result = babel.transform(src, {
-      babelrc: false,
-      compact: false,
-      plugins: [
-        // This transforms the regular ESM syntax, import and export statements
-        require.resolve('@babel/plugin-transform-modules-commonjs'),
-        // This transforms dynamic `import()`, which is not supported yet in the Node.js VM API
-        require.resolve('babel-plugin-dynamic-import-node'),
-      ],
-    });
-
-    return result.code;
-  },
-};