fix: ignore and skip virtual modules

package.json

@@ -53,6 +53,7 @@
     "@rollup/plugin-babel": "6.0.2",
     "@rollup/plugin-commonjs": "23.0.2",
     "@rollup/plugin-node-resolve": "15.0.1",
+    "@rollup/plugin-virtual": "3.0.1",
     "@typescript-eslint/eslint-plugin": "5.41.0",
     "@typescript-eslint/parser": "5.41.0",
     "babel-plugin-add-module-exports": "1.0.4",

src/license-plugin.js

@@ -143,6 +143,11 @@ class LicensePlugin {
       this.debug(`scanning internal module ${id}`);
     }
 
+    if (id.indexOf('virtual:') === 0) {
+      this.debug(`skipping virtual module: ${id}`);
+      return;
+    }
+
     this.debug(`scanning ${id}`);
 
     // Look for the `package.json` file
@@ -151,6 +156,8 @@ class LicensePlugin {
 
     const scannedDirs = [];
 
+    this.debug(`iterative over directory tree, starting with: ${dir}`);
+
     while (dir && dir !== this._cwd && !scannedDirs.includes(dir)) {
       // Try the cache.
       if (_.has(this._cache, dir)) {
@@ -165,6 +172,7 @@ class LicensePlugin {
 
       scannedDirs.push(dir);
 
+      this.debug(`looking for package.json file in: ${dir}`);
       const pkgPath = path.join(dir, 'package.json');
       const exists = fs.existsSync(pkgPath);
       if (exists) {
@@ -207,7 +215,13 @@ class LicensePlugin {
       }
 
       // Go up in the directory tree.
-      dir = path.normalize(path.join(dir, '..'));
+      const newDir = path.normalize(path.join(dir, '..'));
+      if (newDir === '.') {
+        break;
+      }
+
+      this.debug(`going up in the directory tree: ${newDir}`);
+      dir = newDir;
     }
 
     // Update the cache

test/integration/bundle-virtual.js

@@ -0,0 +1,30 @@
+/**
+ * The MIT License (MIT)
+ *
+ * Copyright (c) 2016-2022 Mickael Jeanroy
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+
+import reduce from 'lodash/reduce';
+
+// eslint-disable-next-line require-jsdoc
+export function sum(array) {
+  return reduce(array, (acc, x) => acc + x, 0);
+}

test/integration/it.spec.js

@@ -29,6 +29,7 @@ import _ from 'lodash';
 import * as rollup from 'rollup';
 import nodeResolve from '@rollup/plugin-node-resolve';
 import commonjs from '@rollup/plugin-commonjs';
+import virtual from '@rollup/plugin-virtual';
 import licensePlugin from '../../src/index.js';
 import {join} from '../utils/join.js';
 
@@ -181,6 +182,39 @@ describe('rollup-plugin-license', () => {
     });
   });
 
+  it('should generate bundle with license header ignoring virtual modules', (done) => {
+    const banner = 'test banner';
+    const rollupConfig = {
+      input: path.join(__dirname, 'bundle-virtual.js'),
+
+      output: {
+        file: path.join(tmpDir.name, 'bundle-virtual.js'),
+        format: 'es',
+      },
+
+      plugins: [
+        virtual({
+          'lodash/reduce': `
+            export default () => {};
+          `,
+        }),
+        licensePlugin({
+          banner,
+        }),
+      ],
+    };
+
+    writeBundle(rollupConfig).then(() => {
+      verifyFile(rollupConfig.output.file, done, (data) => {
+        expect(data.toString()).toContain(join([
+          `/**`,
+          ` * ${banner}`,
+          ` */`,
+        ]));
+      });
+    });
+  });
+
   it('should generate bundle with license header from content as a raw string', (done) => {
     const content = 'Banner from inline content';
     const banner = {content};