Merge pull request #1280 from log4js-node/1277-when-the-type-is-module-there-is-an-error-when-reading-appenders-how-to-deal-with-it

fix: load CJS appenders for ESM packages

lib/appenders/index.js

@@ -22,10 +22,18 @@ coreAppenders.set('tcp', require('./tcp'));
 const appenders = new Map();
 
 const tryLoading = (modulePath, config) => {
-  debug('Loading module from ', modulePath);
+  let resolvedPath;
+  try {
+    const modulePathCJS = `${modulePath}.cjs`;
+    resolvedPath = require.resolve(modulePathCJS);
+    debug('Loading module from ', modulePathCJS);
+  } catch (e) {
+    resolvedPath = modulePath;
+    debug('Loading module from ', modulePath);
+  }
   try {
     // eslint-disable-next-line global-require, import/no-dynamic-require
-    return require(modulePath);
+    return require(resolvedPath);
   } catch (e) {
     // if the module was found, and we still got an error, then raise it
     configuration.throwExceptionIf(