feat: use cosmiconfig for finding configuration files

README.md

@@ -26,7 +26,7 @@ Or you can use the JavaScript api
 import { register } from 'node:module';
 register('node-esm-loader', import.meta.url, {
 
-  // Optional, will use the default .loaderrc.js config file if present
+  // Optional, will search for a configuration file automatically if not specified
   data: {
     loaderConfig: './path/to/config.js',
   },
@@ -39,9 +39,10 @@ node --import=./register.js ./your/file.js
 ```
 For more info about this, see https://nodejs.org/api/module.html#customization-hooks
 
-`node-esm-loader` loader will subsequently look for a `.loaderrc.mjs` or `.loaderrc.js` file that exports the configuration.
-This file can look something like this:
+`node-esm-loader` loader will subsequently look for a configuration file in various places using [cosmiconfig](https://www.npmjs.com/package/cosmiconfig), where it also looks up the directory tree.
+My advice is to either use `.loaderrc.js`, or use a `.config` folder with `.config/loaderrc.js`, but `loader.config.js` will also work.
 ```js
+// .loaderrc.js, loader.config.js or .config/loaderrc.js
 export default {
   loaders: [
     'vue-esm-loader',
@@ -57,8 +58,9 @@ export default {
   ],
 };
 ```
+For more info on what the loaders configuration should look like, have a look at [create-esm-loader](https://www.npmjs.com/package/create-esm-loader).
 
-If you want to store the loader config in a different file, you can use
+If you want to put the loader config in a different file, you can use
 ```
 node --import=node-esm-loader/register ./your-file.js --loader-config=./path/to/config.js
 ```
@@ -70,8 +72,6 @@ module.exports = {
 };
 ```
 
-For more info on what the loaders configuration should look like, have a look at [create-esm-loader](https://www.npmjs.com/package/create-esm-loader).
-
 ## Compatible Loaders
 
 You can find a [list of compatible loaders][loaderlist], here:

lib/lookup.js

@@ -4,12 +4,7 @@
 import { pathToFileURL } from 'node:url';
 import path from 'node:path';
 import findUp from 'find-up';
-
-// The supported config files we look for, in that order.
-const CONFIG_FILES = [
-	'.loaderrc.mjs',
-	'.loaderrc.js',
-];
+import { cosmiconfig } from 'cosmiconfig';
 
 // Finds and loads the configuration file based on the parameters the process 
 // was run with.
@@ -21,7 +16,7 @@ export default async function lookup({ loaderConfig, cwd = process.cwd() }) {
 	if (loaderConfig) {
 		fullPath = path.resolve(process.cwd(), loaderConfig);
 	} else {
-		fullPath = findConfig(cwd);
+		fullPath = await findConfig(cwd);
 	}
 	return fullPath ? await loadConfig(fullPath) : {};
 }
@@ -36,6 +31,10 @@ export async function loadConfig(file) {
 
 // This function looks for a `.loaderrc` file in case no loader configuration 
 // was explicitly specified.
-export function findConfig(cwd = process.cwd()) {
-	return findUp.sync(CONFIG_FILES, { cwd });
+export async function findConfig(cwd = process.cwd()) {
+	const explorer = cosmiconfig('loader', {
+		searchStrategy: 'global',
+	});
+	let config = await explorer.search(cwd);
+	return config?.filepath;
 }