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