0.2.0 - Mid migration

web/node_modules/jest-config/node_modules/jest-resolve/build/shouldLoadAsEsm.js

@@ -0,0 +1,113 @@
+'use strict';
+
+Object.defineProperty(exports, '__esModule', {
+  value: true
+});
+exports.clearCachedLookups = clearCachedLookups;
+exports.default = cachedShouldLoadAsEsm;
+
+function _path() {
+  const data = require('path');
+
+  _path = function () {
+    return data;
+  };
+
+  return data;
+}
+
+function _vm() {
+  const data = require('vm');
+
+  _vm = function () {
+    return data;
+  };
+
+  return data;
+}
+
+function _readPkgUp() {
+  const data = _interopRequireDefault(require('read-pkg-up'));
+
+  _readPkgUp = function () {
+    return data;
+  };
+
+  return data;
+}
+
+function _interopRequireDefault(obj) {
+  return obj && obj.__esModule ? obj : {default: obj};
+}
+
+/**
+ * Copyright (c) Facebook, Inc. and its affiliates. All Rights Reserved.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ */
+// @ts-expect-error: experimental, not added to the types
+const runtimeSupportsVmModules = typeof _vm().SyntheticModule === 'function';
+const cachedFileLookups = new Map();
+const cachedDirLookups = new Map();
+
+function clearCachedLookups() {
+  cachedFileLookups.clear();
+  cachedDirLookups.clear();
+}
+
+function cachedShouldLoadAsEsm(path) {
+  let cachedLookup = cachedFileLookups.get(path);
+
+  if (cachedLookup === undefined) {
+    cachedLookup = shouldLoadAsEsm(path);
+    cachedFileLookups.set(path, cachedLookup);
+  }
+
+  return cachedLookup;
+} // this is a bad version of what https://github.com/nodejs/modules/issues/393 would provide
+
+function shouldLoadAsEsm(path) {
+  if (!runtimeSupportsVmModules) {
+    return false;
+  }
+
+  const extension = (0, _path().extname)(path);
+
+  if (extension === '.mjs') {
+    return true;
+  }
+
+  if (extension === '.cjs') {
+    return false;
+  } // this isn't correct - we might wanna load any file as a module (using synthetic module)
+  // do we need an option to Jest so people can opt in to ESM for non-js?
+
+  if (extension !== '.js') {
+    return false;
+  }
+
+  const cwd = (0, _path().dirname)(path);
+  let cachedLookup = cachedDirLookups.get(cwd);
+
+  if (cachedLookup === undefined) {
+    cachedLookup = cachedPkgCheck(cwd);
+    cachedFileLookups.set(cwd, cachedLookup);
+  }
+
+  return cachedLookup;
+}
+
+function cachedPkgCheck(cwd) {
+  // TODO: can we cache lookups somehow?
+  const pkg = _readPkgUp().default.sync({
+    cwd,
+    normalize: false
+  });
+
+  if (!pkg) {
+    return false;
+  }
+
+  return pkg.packageJson.type === 'module';
+}