Add node modules and compiled JavaScript from main

node_modules/@babel/helpers/scripts/generate-helpers.js

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+import fs from "fs";
+import { join } from "path";
+import { URL, fileURLToPath } from "url";
+import { minify } from "terser"; // eslint-disable-line import/no-extraneous-dependencies
+
+const HELPERS_FOLDER = new URL("../src/helpers", import.meta.url);
+const IGNORED_FILES = new Set(["package.json"]);
+
+export default async function generateHelpers() {
+  let output = `/*
+ * This file is auto-generated! Do not modify it directly.
+ * To re-generate run 'yarn gulp generate-runtime-helpers'
+ */
+
+import template from "@babel/template";
+
+function helper(minVersion: string, source: string) {
+  return Object.freeze({
+    minVersion,
+    ast: () => template.program.ast(source, { preserveComments: true }),
+  })
+}
+
+export default Object.freeze({
+`;
+
+  for (const file of (await fs.promises.readdir(HELPERS_FOLDER)).sort()) {
+    if (IGNORED_FILES.has(file)) continue;
+    if (file.startsWith(".")) continue; // ignore e.g. vim swap files
+
+    const [helperName] = file.split(".");
+
+    const filePath = join(fileURLToPath(HELPERS_FOLDER), file);
+    if (!file.endsWith(".js")) {
+      console.error("ignoring", filePath);
+      continue;
+    }
+
+    const fileContents = await fs.promises.readFile(filePath, "utf8");
+    const minVersionMatch = fileContents.match(
+      /^\s*\/\*\s*@minVersion\s+(?<minVersion>\S+)\s*\*\/\s*$/m
+    );
+    if (!minVersionMatch) {
+      throw new Error(`@minVersion number missing in ${filePath}`);
+    }
+    const { minVersion } = minVersionMatch.groups;
+
+    const source = await minify(fileContents, {
+      mangle: false,
+      // The _typeof helper has a custom directive that we must keep
+      compress: { directives: false },
+    });
+
+    output += `\
+  ${JSON.stringify(helperName)}: helper(
+    ${JSON.stringify(minVersion)},
+    ${JSON.stringify(source.code)},
+  ),
+`;
+  }
+
+  output += "});";
+  return output;
+}

node_modules/@babel/helpers/scripts/generate-regenerator-runtime.js

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+/* eslint-disable import/no-extraneous-dependencies */
+
+import fs from "fs";
+import { createRequire } from "module";
+
+const [parse, generate] = await Promise.all([
+  import("@babel/parser").then(ns => ns.parse),
+  import("@babel/generator").then(ns => ns.default.default),
+]).catch(error =>
+  Promise.reject(
+    new Error(
+      "Before running generate-helpers.js you must compile @babel/parser and @babel/generator.",
+      { cause: error }
+    )
+  )
+);
+
+const REGENERATOR_RUNTIME_IN_FILE = fs.readFileSync(
+  createRequire(import.meta.url).resolve("regenerator-runtime"),
+  "utf8"
+);
+
+const MIN_VERSION = "7.18.0";
+
+const HEADER = `/* @minVersion ${MIN_VERSION} */
+/*
+ * This file is auto-generated! Do not modify it directly.
+ * To re-generate, update the regenerator-runtime dependency of
+ * @babel/helpers and run 'yarn gulp generate-runtime-helpers'.
+ */
+
+/* eslint-disable */
+`;
+
+const COPYRIGHT = `/*! regenerator-runtime -- Copyright (c) 2014-present, Facebook, Inc. -- license (MIT): https://github.com/facebook/regenerator/blob/main/LICENSE */`;
+
+export default function generateRegeneratorRuntimeHelper() {
+  const ast = parse(REGENERATOR_RUNTIME_IN_FILE, { sourceType: "script" });
+
+  const factoryFunction = ast.program.body[0].declarations[0].init.callee;
+  factoryFunction.type = "FunctionDeclaration";
+  factoryFunction.id = { type: "Identifier", name: "_regeneratorRuntime" };
+  factoryFunction.params = [];
+  factoryFunction.body.body.unshift(
+    ...stmts(`
+      ${COPYRIGHT}
+      _regeneratorRuntime = function () { return exports; };
+      var exports = {};
+    `)
+  );
+
+  const { code } = generate({
+    type: "ExportDefaultDeclaration",
+    declaration: factoryFunction,
+  });
+
+  return HEADER + code;
+}
+
+function stmts(code) {
+  return parse(`function _() { ${code} }`, {
+    sourceType: "script",
+  }).program.body[0].body.body;
+}

node_modules/@babel/helpers/scripts/package.json

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+{ "type": "module" }