Implement assumptions defined in the babel/rfcs#5 RFC

- `mutableTemplateObject` and `ignoreToPrimitiveHint` (#12408)
- `setClassMethods` (#12407)
- `setComputedProperties` (#12490)
- `ignoreFunctionLength` (#12491)
- `noDocumentAll` (#12481)
- `iterableIsArray` and `arrayLikeIsIterable` (#12489)
- `pureGetters` (#12504)
- `skipForOfIteratorClosing` (#12496)
- `objectRestNoSymbols`, `setSpreadProperties` and `pureGetters` (#12505)
- `noNewArrows` (#12613, #12793)
- `setPublicClassFields` and `privateFieldsAsProperties` (#12497)
- `constantReexports` and `enumerableModuleMeta` (#12618)
- `constantSuper`, `superIsCallableConstructor` and `noClassCalls` (#12726)

Co-authored-by: Justin Ridgewell <justin@ridgewell.name>
Co-authored-by: Huáng Jùnliàng <JLHwung@users.noreply.github.com>

packages/babel-plugin-transform-modules-umd/test/fixtures/assumption-enumerableModuleMeta/export/input.mjs

@@ -0,0 +1 @@
+export var foo = 2;

packages/babel-plugin-transform-modules-umd/test/fixtures/assumption-enumerableModuleMeta/export/output.js

@@ -0,0 +1,20 @@
+(function (global, factory) {
+  if (typeof define === "function" && define.amd) {
+    define(["exports"], factory);
+  } else if (typeof exports !== "undefined") {
+    factory(exports);
+  } else {
+    var mod = {
+      exports: {}
+    };
+    factory(mod.exports);
+    global.input = mod.exports;
+  }
+})(typeof globalThis !== "undefined" ? globalThis : typeof self !== "undefined" ? self : this, function (_exports) {
+  "use strict";
+
+  _exports.__esModule = true;
+  _exports.foo = void 0;
+  var foo = 2;
+  _exports.foo = foo;
+});

packages/babel-plugin-transform-modules-umd/test/fixtures/assumption-enumerableModuleMeta/options.json

@@ -0,0 +1,6 @@
+{
+  "assumptions": {
+    "enumerableModuleMeta": true
+  },
+  "plugins": ["external-helpers", "transform-modules-umd"]
+}