Add types to scripts and config files

Summary:
Now that we have some TypeScript infra set up, move scripts (mainly the benchmarking one) and config files to TypeScript.

Starts to move away a bit from the magic globals used in the JS environment.

Differential Revision: D45511176

fbshipit-source-id: 541b967a276d2894e68b505169fc69096589d8c4

javascript/jest.setup.ts

@@ -0,0 +1,24 @@
+/**
+ * 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
+ */
+
+module.exports = async () => {
+  if (process.env["SYNC"] === "1" && process.env["WASM"] === "1") {
+    globalThis.Yoga = require("./dist/entrypoint/wasm-sync");
+  } else if (process.env["SYNC"] === "1") {
+    globalThis.Yoga = require("./dist/entrypoint/asmjs-sync");
+  } else if (process.env["WASM"] === "1") {
+    globalThis.Yoga = await require("./dist/entrypoint/wasm-async").loadYoga();
+  } else {
+    globalThis.Yoga = await require("./dist/entrypoint/asmjs-async").loadYoga();
+  }
+};
+
+Object.defineProperty(globalThis, "YGBENCHMARK", {
+  get: () => globalThis.test,
+});