2.0.6 - Added support for automatic .js, .cjs, .mjs file matches in i…

…mport

README.md

@@ -144,6 +144,7 @@ Module name or relative path similar to CommonJS [require](https://nodejs.org/ap
 - `'./dogs.mjs'`
 - `'./minimal'`
     -  `importSync` will look for `'./minimal.js'` before `'./minimal.mjs'`
+    -  `importSync` will look for matching extensions in the order `[.js, .mjs, .cjs]`
 - `'node-fetch'`
     - `importSync` can import pure-esm [node-fetch](https://github.com/node-fetch/node-fetch) (v3) in your cjs project
 

package.json

@@ -4,7 +4,7 @@
     "type": "git",
     "url": "https://github.com/nktnet1/import-sync"
   },
-  "version": "2.0.5",
+  "version": "2.0.6",
   "files": [
     "dist"
   ],
@@ -47,8 +47,8 @@
     "@types/node": "^20.8.7",
     "@typescript-eslint/eslint-plugin": "^6.8.0",
     "@typescript-eslint/parser": "^6.8.0",
-    "eslint": "^8.51.0",
-    "eslint-plugin-jest": "^27.4.2",
+    "eslint": "^8.52.0",
+    "eslint-plugin-jest": "^27.4.3",
     "jest": "^29.7.0",
     "node-fetch": "^3.3.2",
     "ts-jest": "^29.1.1",

src/config.ts

@@ -0,0 +1 @@
+export const VALID_FILE_EXTENSIONS = Object.freeze(['.js', '.mjs', '.cjs']);

src/files.ts

@@ -1,3 +1,7 @@
+import fs from 'fs';
+import path from 'path';
+import { VALID_FILE_EXTENSIONS } from './config';
+
 /**
  * Get the file path of the caller function.
  *
@@ -15,3 +19,30 @@ export const getCallerFilePath = (): string => {
   Error.prepareStackTrace = orig;
   return stack[1].getFileName();
 };
+
+/**
+ * Find the module file path by checking for available extensions
+ * as defined by VALID_FILE_EXTENSIONS
+ *
+ * @param {string} modulePath - The path to the module
+ * @param {string} basePath - The base path for the module
+ * @returns {string} The resolved file path
+ * @throws {Error} If the file is not found
+ */
+export const findModuleFile = (modulePath: string, basePath: string): string => {
+  const filePath = path.join(basePath, modulePath);
+  if (fs.existsSync(filePath)) {
+    return filePath;
+  }
+  if (!path.extname(filePath)) {
+    for (const ext of VALID_FILE_EXTENSIONS) {
+      const extFilePath = path.join(basePath, `${modulePath}${ext}`);
+      if (fs.existsSync(extFilePath)) {
+        return extFilePath;
+      }
+    }
+  }
+  throw new Error(
+    `No such file '${filePath}' with matching extensions [${VALID_FILE_EXTENSIONS}]`
+  );
+};

src/import.ts

@@ -2,7 +2,7 @@ import esm from 'esm';
 import path from 'path';
 import fs from 'fs';
 import { ESMOptions, Options } from './types';
-import { getCallerFilePath } from './files';
+import { findModuleFile, getCallerFilePath } from './files';
 
 /**
  * Creates an esm-compatible require function that can import ES Modules
@@ -48,10 +48,7 @@ const importSync = (id: string, options: Options = {}) => {
     esmOptions: {},
   };
   const opts = { ...defaultOptions, ...options };
-  let modulePath = id;
-  if (/^\.\.?\//.test(id)) {
-    modulePath = path.join(opts.basePath, id);
-  }
+  const modulePath = /^\.\.?\//.test(id) ? findModuleFile(id, opts.basePath) : id;
   const es6Require = createEs6Require(opts.esmOptions);
   try {
     return es6Require(modulePath);