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node_modules/@humanwhocodes/module-importer/src/module-importer.cjs

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+/**
+ * @fileoverview Universal module importer
+ */
+
+//-----------------------------------------------------------------------------
+// Imports
+//-----------------------------------------------------------------------------
+
+const { createRequire } = require("module");
+const { pathToFileURL }  = require("url");
+
+//-----------------------------------------------------------------------------
+// Helpers
+//-----------------------------------------------------------------------------
+
+const SLASHES = new Set(["/", "\\"]);
+
+/**
+ * Normalizes directories to have a trailing slash.
+ * Resolve is pretty finicky -- if the directory name doesn't have
+ * a trailing slash then it tries to look in the parent directory.
+ * i.e., if the directory is "/usr/nzakas/foo" it will start the 
+ * search in /usr/nzakas. However, if the directory is "/user/nzakas/foo/",
+ * then it will start the search in /user/nzakas/foo.
+ * @param {string} directory The directory to check. 
+ * @returns {string} The normalized directory.
+ */
+function normalizeDirectory(directory) {
+    if (!SLASHES.has(directory[directory.length-1])) {
+        return directory + "/";
+    }
+
+    return directory;
+}
+
+//-----------------------------------------------------------------------------
+// Exports
+//-----------------------------------------------------------------------------
+
+/**
+ * Class for importing both CommonJS and ESM modules in Node.js.
+ */
+exports.ModuleImporter = class ModuleImporter {
+
+    /**
+     * Creates a new instance.
+     * @param {string} [cwd] The current working directory to resolve from. 
+     */
+    constructor(cwd = process.cwd()) {
+
+        /**
+         * The base directory from which paths should be resolved.
+         * @type {string}
+         */
+        this.cwd = normalizeDirectory(cwd);
+    }
+
+    /**
+     * Resolves a module based on its name or location.
+     * @param {string} specifier Either an npm package name or
+     *      relative file path.
+     * @returns {string|undefined} The location of the import.
+     * @throws {Error} If specifier cannot be located.
+     */
+    resolve(specifier) {
+        const require = createRequire(this.cwd);
+        return require.resolve(specifier);
+    }
+
+    /**
+     * Imports a module based on its name or location.
+     * @param {string} specifier Either an npm package name or
+     *      relative file path.
+     * @returns {Promise<object>} The module's object.
+     */
+    import(specifier) {
+        const location = this.resolve(specifier);
+        return import(pathToFileURL(location).href);
+    }
+
+}

node_modules/@humanwhocodes/module-importer/src/module-importer.js

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+/**
+ * @fileoverview Universal module importer
+ */
+
+//-----------------------------------------------------------------------------
+// Imports
+//-----------------------------------------------------------------------------
+
+import { createRequire } from "module";
+import { fileURLToPath } from "url";
+import { dirname } from "path";
+
+//-----------------------------------------------------------------------------
+// Helpers
+//-----------------------------------------------------------------------------
+
+const __filename = fileURLToPath(import.meta.url);
+const __dirname = dirname(__filename);
+const require = createRequire(__dirname + "/");
+const { ModuleImporter } = require("./module-importer.cjs");
+
+export { ModuleImporter };