feat: add support for module-sync export condition in Node.js 22+

src/resolve-dependency.ts

@@ -1,6 +1,7 @@
 import { isAbsolute, resolve, sep } from 'path';
 import { builtinModules } from 'module';
 import { Job } from './node-file-trace';
+import { getNodeMajorVersion } from './utils/node-version';
 
 // node resolver
 // custom implementation to emit only needed package.json files for resolver
@@ -168,6 +169,7 @@ function getExportsTarget(
         condition === 'default' ||
         (condition === 'require' && cjsResolve) ||
         (condition === 'import' && !cjsResolve) ||
+        (condition === 'module-sync' && getNodeMajorVersion() >= 22) ||
         conditions.includes(condition)
       ) {
         const target = getExportsTarget(

src/utils/node-version.ts

@@ -0,0 +1,7 @@
+/**
+ * Gets the major version of the current Node.js runtime
+ * @returns The major version number (e.g., 22 for Node.js v22.16.0)
+ */
+export function getNodeMajorVersion(): number {
+  return parseInt(process.versions.node.split('.')[0], 10);
+}

test/unit.test.js

@@ -25,6 +25,8 @@ const skipOnWindows = [
   'require-symlink',
 ];
 const skipOnMac = [];
+const skipOnNode20AndBelow = ['module-sync-condition-es'];
+const skipOnNode22AndAbove = ['module-sync-condition-es-node20'];
 if (process.platform === 'darwin' && process.arch === 'arm64') {
   skipOnMac.push('microtime-node-gyp');
 }
@@ -68,6 +70,7 @@ afterEach(resetFileIOMocks);
 
 for (const { testName, isRoot } of unitTests) {
   const testSuffix = `${testName} from ${isRoot ? 'root' : 'cwd'}`;
+  const nodeVersion = parseInt(process.versions.node.split('.')[0], 10);
   if (
     process.platform === 'win32' &&
     (isRoot || skipOnWindows.includes(testName))
@@ -79,6 +82,14 @@ for (const { testName, isRoot } of unitTests) {
     console.log(`Skipping unit test on macOS: ${testSuffix}`);
     continue;
   }
+  if (nodeVersion < 22 && skipOnNode20AndBelow.includes(testName)) {
+    console.log(`Skipping unit test on Node.js 20 or below: ${testSuffix}`);
+    continue;
+  }
+  if (nodeVersion >= 22 && skipOnNode22AndAbove.includes(testName)) {
+    console.log(`Skipping unit test on Node.js 22 or above: ${testSuffix}`);
+    continue;
+  }
   const unitPath = join(__dirname, 'unit', testName);
 
   it(`should correctly trace ${testSuffix}`, async () => {

test/unit/module-sync-condition-cjs/fallback.js

@@ -0,0 +1 @@
+export const test = 'fallback version'; 

test/unit/module-sync-condition-cjs/import.js

@@ -0,0 +1 @@
+export const test = 'import version'; 

test/unit/module-sync-condition-cjs/input.js

@@ -0,0 +1,2 @@
+import { test } from 'test-pkg-sync-es';
+console.log(test); 

test/unit/module-sync-condition-cjs/module-sync.js

@@ -0,0 +1 @@
+export const test = 'module-sync version'; 

test/unit/module-sync-condition-cjs/output.js

@@ -0,0 +1,4 @@
+[
+  "test/unit/module-sync-condition-cjs/input.js",
+  "test/unit/module-sync-condition-cjs/package.json"
+] 

test/unit/module-sync-condition-cjs/package.json

@@ -0,0 +1,11 @@
+{
+  "name": "test-pkg-sync-cjs",
+  "type": "commonjs", 
+  "exports": {
+    ".": {
+      "module-sync": "./module-sync.js",
+      "import": "./import.js",
+      "default": "./fallback.js"
+    }
+  }
+} 

test/unit/module-sync-condition-es-node20/fallback.js

@@ -0,0 +1 @@
+export const test = 'fallback version'; 

test/unit/module-sync-condition-es-node20/import.js

@@ -0,0 +1 @@
+export const test = 'import version'; 

test/unit/module-sync-condition-es-node20/input.js

@@ -0,0 +1,2 @@
+import { test } from 'test-pkg-sync-es';
+console.log(test); 

test/unit/module-sync-condition-es-node20/module-sync.js

@@ -0,0 +1 @@
+export const test = 'module-sync version'; 

test/unit/module-sync-condition-es-node20/output.js

@@ -0,0 +1,5 @@
+[
+  "test/unit/module-sync-condition-es-node20/import.js",
+  "test/unit/module-sync-condition-es-node20/input.js",
+  "test/unit/module-sync-condition-es-node20/package.json"
+] 

test/unit/module-sync-condition-es-node20/package.json

@@ -0,0 +1,11 @@
+{
+  "name": "test-pkg-sync-es",
+  "type": "module", 
+  "exports": {
+    ".": {
+      "module-sync": "./module-sync.js",
+      "import": "./import.js",
+      "default": "./fallback.js"
+    }
+  }
+} 

test/unit/module-sync-condition-es/fallback.js

@@ -0,0 +1 @@
+export const test = 'fallback version'; 

test/unit/module-sync-condition-es/import.js

@@ -0,0 +1 @@
+export const test = 'import version'; 

test/unit/module-sync-condition-es/input.js

@@ -0,0 +1,2 @@
+import { test } from 'test-pkg-sync-es';
+console.log(test); 

test/unit/module-sync-condition-es/module-sync.js

@@ -0,0 +1 @@
+export const test = 'module-sync version'; 

test/unit/module-sync-condition-es/output.js

@@ -0,0 +1,5 @@
+[
+  "test/unit/module-sync-condition-es/input.js",
+  "test/unit/module-sync-condition-es/module-sync.js",
+  "test/unit/module-sync-condition-es/package.json"
+] 

test/unit/module-sync-condition-es/package.json

@@ -0,0 +1,11 @@
+{
+  "name": "test-pkg-sync-es",
+  "type": "module", 
+  "exports": {
+    ".": {
+      "module-sync": "./module-sync.js",
+      "import": "./import.js",
+      "default": "./fallback.js"
+    }
+  }
+}