fix(node): Correctly resolve module name

packages/node/src/module.ts

@@ -1,6 +1,5 @@
 import { posix, sep } from 'path';
-
-const isWindowsPlatform = sep === '\\';
+import { dirname } from '@sentry/utils';
 
 /** normalizes Windows paths */
 function normalizeWindowsPath(path: string): string {
@@ -9,52 +8,62 @@ function normalizeWindowsPath(path: string): string {
     .replace(/\\/g, '/'); // replace all `\` instances with `/`
 }
 
+// We cache this so we don't have to recompute it
+let basePath: string | undefined;
+
+function getBasePath(): string {
+  if (!basePath) {
+    const baseDir =
+      require && require.main && require.main.filename ? dirname(require.main.filename) : global.process.cwd();
+    basePath = `${baseDir}/`;
+  }
+
+  return basePath;
+}
+
 /** Gets the module from a filename */
 export function getModuleFromFilename(
   filename: string | undefined,
-  normalizeWindowsPathSeparator: boolean = isWindowsPlatform,
+  basePath: string = getBasePath(),
+  isWindows: boolean = sep === '\\',
 ): string | undefined {
   if (!filename) {
     return;
   }
 
-  const normalizedFilename = normalizeWindowsPathSeparator ? normalizeWindowsPath(filename) : filename;
+  const normalizedBase = isWindows ? normalizeWindowsPath(basePath) : basePath;
+  const normalizedFilename = isWindows ? normalizeWindowsPath(filename) : filename;
 
   // eslint-disable-next-line prefer-const
-  let { root, dir, base: basename, ext } = posix.parse(normalizedFilename);
-
-  const base = (require && require.main && require.main.filename && dir) || global.process.cwd();
-
-  const normalizedBase = `${base}/`;
-
-  // It's specifically a module
-  let file = basename;
+  let { dir, base: file, ext } = posix.parse(normalizedFilename);
 
   if (ext === '.js' || ext === '.mjs' || ext === '.cjs') {
     file = file.slice(0, ext.length * -1);
   }
 
-  if (!root && !dir) {
+  if (!dir) {
     // No dirname whatsoever
     dir = '.';
   }
 
-  let n = dir.lastIndexOf('/node_modules/');
+  let n = dir.lastIndexOf('/node_modules');
   if (n > -1) {
-    // /node_modules/ is 14 chars
     return `${dir.slice(n + 14).replace(/\//g, '.')}:${file}`;
   }
+
   // Let's see if it's a part of the main module
   // To be a part of main module, it has to share the same base
   n = `${dir}/`.lastIndexOf(normalizedBase, 0);
-
   if (n === 0) {
     let moduleName = dir.slice(normalizedBase.length).replace(/\//g, '.');
+
     if (moduleName) {
       moduleName += ':';
     }
     moduleName += file;
+
     return moduleName;
   }
+
   return file;
 }

packages/node/test/module.test.ts

@@ -1,42 +1,40 @@
 import { getModuleFromFilename } from '../src/module';
 
-function withFilename(fn: () => void, filename: string) {
-  const prevFilename = require.main?.filename;
-  if (require.main?.filename) {
-    require.main.filename = filename;
-  }
-
-  try {
-    fn();
-  } finally {
-    if (require.main && prevFilename) {
-      require.main.filename = prevFilename;
-    }
-  }
-}
-
 describe('getModuleFromFilename', () => {
   test('Windows', () => {
-    withFilename(() => {
-      expect(getModuleFromFilename('C:\\Users\\users\\Tim\\Desktop\\node_modules\\module.js', true)).toEqual('module');
-    }, 'C:\\Users\\Tim\\app.js');
+    expect(
+      getModuleFromFilename('C:\\Users\\Tim\\node_modules\\some-dep\\module.js', 'C:\\Users\\Tim\\', true),
+    ).toEqual('some-dep:module');
+
+    expect(getModuleFromFilename('C:\\Users\\Tim\\some\\more\\feature.js', 'C:\\Users\\Tim\\', true)).toEqual(
+      'some.more:feature',
+    );
   });
 
   test('POSIX', () => {
-    withFilename(() => {
-      expect(getModuleFromFilename('/Users/users/Tim/Desktop/node_modules/module.js')).toEqual('module');
-    }, '/Users/Tim/app.js');
+    expect(getModuleFromFilename('/Users/Tim/node_modules/some-dep/module.js', '/Users/Tim/')).toEqual(
+      'some-dep:module',
+    );
+
+    expect(getModuleFromFilename('/Users/Tim/some/more/feature.js', '/Users/Tim/')).toEqual('some.more:feature');
+    expect(getModuleFromFilename('/Users/Tim/main.js', '/Users/Tim/')).toEqual('main');
+  });
+
+  test('.mjs', () => {
+    expect(getModuleFromFilename('/Users/Tim/node_modules/some-dep/module.mjs', '/Users/Tim/')).toEqual(
+      'some-dep:module',
+    );
   });
 
-  test('POSIX .mjs', () => {
-    withFilename(() => {
-      expect(getModuleFromFilename('/Users/users/Tim/Desktop/node_modules/module.mjs')).toEqual('module');
-    }, '/Users/Tim/app.js');
+  test('.cjs', () => {
+    expect(getModuleFromFilename('/Users/Tim/node_modules/some-dep/module.cjs', '/Users/Tim/')).toEqual(
+      'some-dep:module',
+    );
   });
 
-  test('POSIX .cjs', () => {
-    withFilename(() => {
-      expect(getModuleFromFilename('/Users/users/Tim/Desktop/node_modules/module.cjs')).toEqual('module');
-    }, '/Users/Tim/app.js');
+  test('node internal', () => {
+    expect(getModuleFromFilename('node.js', '/Users/Tim/')).toEqual('node');
+    expect(getModuleFromFilename('node:internal/process/task_queues', '/Users/Tim/')).toEqual('task_queues');
+    expect(getModuleFromFilename('node:internal/timers', '/Users/Tim/')).toEqual('timers');
   });
 });