In-place JS environment

Summary:
This change restructures the package to try to remove the JS build step from the inner loop. Instead, we have a single `src` directory that we babel transform when using, then apply the same transform inline during prepublish.

At the end, we will be publishing a source directory with Babel transformed TS, JS, and TS declarations.

We do a little spring cleaning when doing this. Fixing up some of the folder/file conventions, and removing the non-export-map fallbacks.

We cannot remove the need for a native build.

Reviewed By: yungsters

Differential Revision: D45682153

fbshipit-source-id: ea2dd75c2dd6e3529b1ef6cf6ac6a64a270049a4

javascript/src/Config.cpp

@@ -0,0 +1,68 @@
+/*
+ * 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.
+ */
+
+#include <yoga/Yoga.h>
+
+#include "./Config.h"
+
+/* static */ Config* Config::create(void) {
+  return new Config();
+}
+
+/* static */ void Config::destroy(Config* node) {
+  delete node;
+}
+
+Config::Config(void) : m_config(YGConfigNew()) {}
+
+Config::~Config(void) {
+  YGConfigFree(m_config);
+}
+
+void Config::setExperimentalFeatureEnabled(int feature, bool enabled) {
+  YGConfigSetExperimentalFeatureEnabled(
+      m_config, static_cast<YGExperimentalFeature>(feature), enabled);
+}
+
+void Config::setPointScaleFactor(float pixelsInPoint) {
+  YGConfigSetPointScaleFactor(m_config, pixelsInPoint);
+}
+
+void Config::setUseLegacyStretchBehaviour(bool useLegacyStretchBehaviour) {
+#pragma clang diagnostic push
+#pragma clang diagnostic ignored "-Wdeprecated"
+  YGConfigSetUseLegacyStretchBehaviour(m_config, useLegacyStretchBehaviour);
+#pragma clang diagnostic pop
+}
+
+void Config::setErrata(int errata) {
+  YGConfigSetErrata(m_config, static_cast<YGErrata>(errata));
+}
+
+void Config::setUseWebDefaults(bool useWebDefaults) {
+  YGConfigSetUseWebDefaults(m_config, useWebDefaults);
+}
+
+bool Config::isExperimentalFeatureEnabled(int feature) const {
+  return YGConfigIsExperimentalFeatureEnabled(
+      m_config, static_cast<YGExperimentalFeature>(feature));
+}
+
+bool Config::useLegacyStretchBehaviour() const {
+#pragma clang diagnostic push
+#pragma clang diagnostic ignored "-Wdeprecated"
+  return YGConfigGetUseLegacyStretchBehaviour(m_config);
+#pragma clang diagnostic pop
+}
+
+int Config::getErrata() const {
+  return static_cast<int>(YGConfigGetErrata(m_config));
+}
+
+bool Config::useWebDefaults() const {
+  return YGConfigGetUseWebDefaults(m_config);
+}