cli: switch to custom jest yaml transform to support node 18

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

packages/cli/config/jest.js

@@ -188,7 +188,7 @@ async function getProjectConfig(targetPath, displayName) {
       ],
       '\\.(bmp|gif|jpg|jpeg|png|frag|xml|svg|eot|woff|woff2|ttf)$':
         require.resolve('./jestFileTransform.js'),
-      '\\.(yaml)$': require.resolve('jest-transform-yaml'),
+      '\\.(yaml)$': require.resolve('./jestYamlTransform'),
     },
 
     // A bit more opinionated

packages/cli/config/jestYamlTransform.js

@@ -0,0 +1,38 @@
+/*
+ * Copyright 2022 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 yaml = require('yaml');
+
+function createTransformer(config) {
+  const process = source => {
+    const json = JSON.stringify(yaml.parse(source), null, 2);
+    return { code: `module.exports = ${json}`, map: null };
+  };
+
+  const getCacheKey = sourceText => {
+    return createHash('md5')
+      .update(sourceText)
+      .update(Buffer.alloc(1))
+      .update(JSON.stringify(config))
+      .update(Buffer.alloc(1))
+      .update('1') // increment whenever the transform logic in this file changes
+      .digest('hex');
+  };
+
+  return { process, getCacheKey };
+}
+
+module.exports = { createTransformer };