Moved

CM2010 Software Design and Development/Topic 2/8.2.4/node_modules/mocha/lib/esm-utils.js

@@ -0,0 +1,92 @@
+const path = require('path');
+const url = require('url');
+
+const formattedImport = async file => {
+  if (path.isAbsolute(file)) {
+    try {
+      return await import(url.pathToFileURL(file));
+    } catch (err) {
+      // This is a hack created because ESM in Node.js (at least in Node v15.5.1) does not emit
+      // the location of the syntax error in the error thrown.
+      // This is problematic because the user can't see what file has the problem,
+      // so we add the file location to the error.
+      // This `if` should be removed once Node.js fixes the problem.
+      if (
+        err instanceof SyntaxError &&
+        err.message &&
+        err.stack &&
+        !err.stack.includes(file)
+      ) {
+        const newErrorWithFilename = new SyntaxError(err.message);
+        newErrorWithFilename.stack = err.stack.replace(
+          /^SyntaxError/,
+          `SyntaxError[ @${file} ]`
+        );
+        throw newErrorWithFilename;
+      }
+      throw err;
+    }
+  }
+  return import(file);
+};
+
+const hasStableEsmImplementation = (() => {
+  const [major, minor] = process.version.split('.');
+  // ESM is stable from v12.22.0 onward
+  // https://nodejs.org/api/esm.html#esm_modules_ecmascript_modules
+  return parseInt(major.slice(1), 10) > 12 || parseInt(minor, 10) >= 22;
+})();
+
+exports.requireOrImport = hasStableEsmImplementation
+  ? async file => {
+      if (path.extname(file) === '.mjs') {
+        return formattedImport(file);
+      }
+      try {
+        return dealWithExports(await formattedImport(file));
+      } catch (err) {
+        if (
+          err.code === 'ERR_MODULE_NOT_FOUND' ||
+          err.code === 'ERR_UNKNOWN_FILE_EXTENSION'
+        ) {
+          return require(file);
+        } else {
+          throw err;
+        }
+      }
+    }
+  : implementationOfRequireOrImportForUnstableEsm;
+
+function dealWithExports(module) {
+  if (module.default) {
+    return module.default;
+  } else {
+    return {...module, default: undefined};
+  }
+}
+
+exports.loadFilesAsync = async (files, preLoadFunc, postLoadFunc) => {
+  for (const file of files) {
+    preLoadFunc(file);
+    const result = await exports.requireOrImport(path.resolve(file));
+    postLoadFunc(file, result);
+  }
+};
+
+/* istanbul ignore next */
+async function implementationOfRequireOrImportForUnstableEsm(file) {
+  if (path.extname(file) === '.mjs') {
+    return formattedImport(file);
+  }
+  // This is currently the only known way of figuring out whether a file is CJS or ESM in
+  // Node.js that doesn't necessitate calling `import` first.
+  try {
+    return require(file);
+  } catch (err) {
+    if (err.code === 'ERR_REQUIRE_ESM') {
+      return formattedImport(file);
+    } else {
+      throw err;
+    }
+  }
+}