Bundle standalone using rollup (#10779)

* chore: bundle babel-standalone via rollup

Co-authored-by: Daniel Tschinder <daniel.tschinder@researchgate.net>

* chore: build babel-preset-env-standalone via Rollup

# Conflicts:
#	yarn.lock

* chore: add babelEnvName

* chore: farewell webpack

* chore: add terser minification

* chore: dedupe some popular dependencies

* chore: remove unused devDependencies

* chore: move plugin-babel-source to scripts/

* make prettier happy

* fix: rewrite available-plugins into esm

* chore: add extra unambiguous sources when env is rollup/standalone

scripts/rollup-plugin-babel-source.js

@@ -0,0 +1,66 @@
+const path = require("path");
+const fs = require("fs");
+const dirname = path.join(__dirname, "..");
+
+module.exports = function() {
+  return {
+    name: "babel-source",
+    load(id) {
+      const matches = id.match(/packages\/(babel-[^/]+)\/src\//);
+      if (matches) {
+        // check if browser field exists for this file and replace
+        const packageFolder = path.join(dirname, "packages", matches[1]);
+        const packageJson = require(path.join(packageFolder, "package.json"));
+
+        if (
+          packageJson["browser"] &&
+          typeof packageJson["browser"] === "object"
+        ) {
+          for (let nodeFile in packageJson["browser"]) {
+            const browserFile = packageJson["browser"][nodeFile].replace(
+              /^(\.\/)?lib\//,
+              "src/"
+            );
+            nodeFile = nodeFile.replace(/^(\.\/)?lib\//, "src/");
+            if (id.endsWith(nodeFile)) {
+              if (browserFile === false) {
+                return "";
+              }
+              return fs.readFileSync(
+                path.join(packageFolder, browserFile),
+                "UTF-8"
+              );
+            }
+          }
+        }
+      }
+      return null;
+    },
+    resolveId(importee) {
+      let packageFolderName;
+      const matches = importee.match(/^@babel\/([^/]+)$/);
+      if (matches) {
+        packageFolderName = `babel-${matches[1]}`;
+      }
+
+      if (packageFolderName) {
+        // resolve babel package names to their src index file
+        const packageFolder = path.join(dirname, "packages", packageFolderName);
+        const packageJson = require(path.join(packageFolder, "package.json"));
+
+        const filename =
+          typeof packageJson["browser"] === "string"
+            ? packageJson["browser"]
+            : packageJson["main"];
+
+        return path.join(
+          packageFolder,
+          // replace lib with src in the pkg.json entry
+          filename.replace(/^(\.\/)?lib\//, "src/")
+        );
+      }
+
+      return null;
+    },
+  };
+};