rename babel-transformer files from ts to tsx

Summary: group files rename

Reviewed By: passy

Differential Revision: D33889860

fbshipit-source-id: 888e173fc72b5e126c1e41324b6cae6be29274c5

desktop/babel-transformer/src/get-cache-key.tsx

@@ -0,0 +1,39 @@
+/**
+ * Copyright (c) Meta Platforms, Inc. and affiliates.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ *
+ * @format
+ */
+
+/**
+ * There are some env vars which affect transformations, so the Metro/Babel cache should be invalidated when at least one of them changed.
+ *
+ * If any issues found with such approach, we can fallback to the implementation which always invalidates caches, but also makes bundling significantly slower:
+ * export default function getCacheKey() { return Math.random().toString(36); }
+ */
+
+import {default as flipperEnv} from './flipper-env';
+import fs from 'fs-extra';
+import path from 'path';
+
+let selfChecksum: string | undefined;
+function getSelfChecksum() {
+  if (!selfChecksum) {
+    selfChecksum = fs
+      .readFileSync(path.resolve(__dirname, '..', 'lib', 'checksum.txt'))
+      .toString();
+  }
+  return selfChecksum;
+}
+
+export default function getCacheKey() {
+  const key = [
+    getSelfChecksum(),
+    ...Object.entries(flipperEnv)
+      .sort(([name1, _value1], [name2, _value2]) => name1.localeCompare(name2))
+      .map(([name, value]) => `${name}=${value}`),
+  ].join('|');
+  return key;
+}