feat(): support for __dirname and __filename

rollup.config.js

@@ -3,6 +3,7 @@ export default {
 	input: 'dist-transpiled/index.js',
 	external: [
 		'path',
+		'crypto',
 		'rollup-plugin-inject'
 	],
 	output: [

src/index.ts

@@ -1,19 +1,48 @@
 // @ts-ignore
 import inject from 'rollup-plugin-inject';
 import { builtinsResolver, NodePolyfillsOptions } from './modules';
+import { dirname, relative } from 'path';
+import { randomBytes } from 'crypto';
 
 export default function (opts: NodePolyfillsOptions = {}) {
   const injectPlugin = inject({
     'process': 'process',
     'Buffer': ['buffer', 'Buffer'],
-    'global': require.resolve('../polyfills/global.js'),
+    'global': GLOBAL_PATH,
+    '__filename': FILENAME_PATH,
+    '__dirname': DIRNAME_PATH,
   });
+  const basedir = opts.baseDir || '/';
+  const dirs = new Map<string, string>();
   const resolver = builtinsResolver(opts);
   return {
     ...injectPlugin,
     name: 'node-polyfills',
-    resolveId(importee: string) {
+    resolveId(importee: string, importer: string) {
+      if (importee === DIRNAME_PATH) {
+        const id = getRandomId();
+        dirs.set(id, dirname('/' + relative(basedir, importer)));
+        return id;
+      }
+      if (importee === FILENAME_PATH) {
+        const id = getRandomId();
+        dirs.set(id, dirname('/' + relative(basedir, importer)));
+        return id;
+      }
       return resolver(importee);
     },
+    load(id: string) {
+      if (dirs.has(id)) {
+        return `export default '${dirs.get(id)}'`;
+      }
+    }
   };
 }
+
+function getRandomId() {
+  return randomBytes(15).toString('hex');
+}
+
+const GLOBAL_PATH = require.resolve('../polyfills/global.js');
+const DIRNAME_PATH = '\0node-polyfills:dirname';
+const FILENAME_PATH = '\0node-polyfills:filename';

src/modules.ts

@@ -3,6 +3,7 @@ const EMPTY_PATH = require.resolve('../polyfills/empty.js');
 export interface NodePolyfillsOptions {
   fs?: boolean;
   crypto?: boolean;
+  baseDir?: string;
 }
 
 export function builtinsResolver(opts: NodePolyfillsOptions) {