Fix.

node_modules/@babel/core/lib/tools/build-external-helpers.js

@@ -0,0 +1,143 @@
+"use strict";
+
+Object.defineProperty(exports, "__esModule", {
+  value: true
+});
+exports.default = _default;
+
+function helpers() {
+  const data = _interopRequireWildcard(require("@babel/helpers"));
+
+  helpers = function () {
+    return data;
+  };
+
+  return data;
+}
+
+function _generator() {
+  const data = _interopRequireDefault(require("@babel/generator"));
+
+  _generator = function () {
+    return data;
+  };
+
+  return data;
+}
+
+function _template() {
+  const data = _interopRequireDefault(require("@babel/template"));
+
+  _template = function () {
+    return data;
+  };
+
+  return data;
+}
+
+function t() {
+  const data = _interopRequireWildcard(require("@babel/types"));
+
+  t = function () {
+    return data;
+  };
+
+  return data;
+}
+
+function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { default: obj }; }
+
+function _interopRequireWildcard(obj) { if (obj && obj.__esModule) { return obj; } else { var newObj = {}; if (obj != null) { for (var key in obj) { if (Object.prototype.hasOwnProperty.call(obj, key)) { var desc = Object.defineProperty && Object.getOwnPropertyDescriptor ? Object.getOwnPropertyDescriptor(obj, key) : {}; if (desc.get || desc.set) { Object.defineProperty(newObj, key, desc); } else { newObj[key] = obj[key]; } } } } newObj.default = obj; return newObj; } }
+
+const buildUmdWrapper = replacements => _template().default`
+    (function (root, factory) {
+      if (typeof define === "function" && define.amd) {
+        define(AMD_ARGUMENTS, factory);
+      } else if (typeof exports === "object") {
+        factory(COMMON_ARGUMENTS);
+      } else {
+        factory(BROWSER_ARGUMENTS);
+      }
+    })(UMD_ROOT, function (FACTORY_PARAMETERS) {
+      FACTORY_BODY
+    });
+  `(replacements);
+
+function buildGlobal(whitelist) {
+  const namespace = t().identifier("babelHelpers");
+  const body = [];
+  const container = t().functionExpression(null, [t().identifier("global")], t().blockStatement(body));
+  const tree = t().program([t().expressionStatement(t().callExpression(container, [t().conditionalExpression(t().binaryExpression("===", t().unaryExpression("typeof", t().identifier("global")), t().stringLiteral("undefined")), t().identifier("self"), t().identifier("global"))]))]);
+  body.push(t().variableDeclaration("var", [t().variableDeclarator(namespace, t().assignmentExpression("=", t().memberExpression(t().identifier("global"), namespace), t().objectExpression([])))]));
+  buildHelpers(body, namespace, whitelist);
+  return tree;
+}
+
+function buildModule(whitelist) {
+  const body = [];
+  const refs = buildHelpers(body, null, whitelist);
+  body.unshift(t().exportNamedDeclaration(null, Object.keys(refs).map(name => {
+    return t().exportSpecifier(t().cloneNode(refs[name]), t().identifier(name));
+  })));
+  return t().program(body, [], "module");
+}
+
+function buildUmd(whitelist) {
+  const namespace = t().identifier("babelHelpers");
+  const body = [];
+  body.push(t().variableDeclaration("var", [t().variableDeclarator(namespace, t().identifier("global"))]));
+  buildHelpers(body, namespace, whitelist);
+  return t().program([buildUmdWrapper({
+    FACTORY_PARAMETERS: t().identifier("global"),
+    BROWSER_ARGUMENTS: t().assignmentExpression("=", t().memberExpression(t().identifier("root"), namespace), t().objectExpression([])),
+    COMMON_ARGUMENTS: t().identifier("exports"),
+    AMD_ARGUMENTS: t().arrayExpression([t().stringLiteral("exports")]),
+    FACTORY_BODY: body,
+    UMD_ROOT: t().identifier("this")
+  })]);
+}
+
+function buildVar(whitelist) {
+  const namespace = t().identifier("babelHelpers");
+  const body = [];
+  body.push(t().variableDeclaration("var", [t().variableDeclarator(namespace, t().objectExpression([]))]));
+  const tree = t().program(body);
+  buildHelpers(body, namespace, whitelist);
+  body.push(t().expressionStatement(namespace));
+  return tree;
+}
+
+function buildHelpers(body, namespace, whitelist) {
+  const getHelperReference = name => {
+    return namespace ? t().memberExpression(namespace, t().identifier(name)) : t().identifier(`_${name}`);
+  };
+
+  const refs = {};
+  helpers().list.forEach(function (name) {
+    if (whitelist && whitelist.indexOf(name) < 0) return;
+    const ref = refs[name] = getHelperReference(name);
+    const {
+      nodes
+    } = helpers().get(name, getHelperReference, ref);
+    body.push(...nodes);
+  });
+  return refs;
+}
+
+function _default(whitelist, outputType = "global") {
+  let tree;
+  const build = {
+    global: buildGlobal,
+    module: buildModule,
+    umd: buildUmd,
+    var: buildVar
+  }[outputType];
+
+  if (build) {
+    tree = build(whitelist);
+  } else {
+    throw new Error(`Unsupported output type ${outputType}`);
+  }
+
+  return (0, _generator().default)(tree).code;
+}