[New] no-unused-modules: support arbitrary module namespace names

Author: sosukesuzuki

src/ExportMap.js

@@ -593,7 +593,7 @@ ExportMap.parse = function (path, content, context) {
           importedSpecifiers.add(specifier.type);
         }
         if (specifier.type === 'ImportSpecifier') {
-          importedSpecifiers.add(specifier.imported.name);
+          importedSpecifiers.add(specifier.imported.name || specifier.imported.value);
         }
 
         // import { type Foo } (Flow)

src/rules/no-unused-modules.js

@@ -604,7 +604,7 @@ module.exports = {
           if (specifiers.length > 0) {
             specifiers.forEach(specifier => {
               if (specifier.exported) {
-                newExportIdentifiers.add(specifier.exported.name);
+                newExportIdentifiers.add(specifier.exported.name || specifier.exported.value);
               }
             });
           }
@@ -715,8 +715,8 @@ module.exports = {
           if (astNode.source) {
             resolvedPath = resolve(astNode.source.raw.replace(/('|")/g, ''), context);
             astNode.specifiers.forEach(specifier => {
-              const name = specifier.local.name;
-              if (specifier.local.name === DEFAULT) {
+              const name = specifier.local.name || specifier.local.value;
+              if (name === DEFAULT) {
                 newDefaultImports.add(resolvedPath);
               } else {
                 newImports.set(name, resolvedPath);
@@ -753,7 +753,7 @@ module.exports = {
                 specifier.type === IMPORT_NAMESPACE_SPECIFIER) {
               return;
             }
-            newImports.set(specifier.imported.name, resolvedPath);
+            newImports.set(specifier.imported.name || specifier.imported.value, resolvedPath);
           });
         }
       });
@@ -942,7 +942,7 @@ module.exports = {
       },
       'ExportNamedDeclaration': node => {
         node.specifiers.forEach(specifier => {
-          checkUsage(node, specifier.exported.name);
+          checkUsage(node, specifier.exported.name || specifier.exported.value);
         });
         forEachDeclarationIdentifier(node.declaration, (name) => {
           checkUsage(node, name);

tests/files/no-unused-modules/arbitrary-module-namespace-identifier-name-a.js

@@ -0,0 +1,2 @@
+const foo = 333
+export { foo as "foo" }

tests/files/no-unused-modules/arbitrary-module-namespace-identifier-name-b.js

@@ -0,0 +1 @@
+import { "foo" as foo } from "./arbitrary-module-namespace-identifier-name-a.js"

tests/files/no-unused-modules/arbitrary-module-namespace-identifier-name-c.js

@@ -0,0 +1,2 @@
+const foo = 333
+export { foo as "foo" }

tests/src/rules/no-unused-modules.js

@@ -1,4 +1,4 @@
-import { test, testFilePath, getTSParsers } from '../utils';
+import { test, testVersion, testFilePath, getTSParsers } from '../utils';
 import jsxConfig from '../../../config/react';
 import typescriptConfig from '../../../config/typescript';
 
@@ -1261,3 +1261,33 @@ describe('support (nested) destructuring assignment', () => {
     invalid: [],
   });
 });
+
+describe('support ES2022 Arbitrary module namespace identifier names', () => {
+  ruleTester.run('no-unused-module', rule, {
+    valid: [].concat(
+      testVersion('>= 8.7', () => ({
+        options: unusedExportsOptions,
+        code: `import { "foo" as foo } from "./arbitrary-module-namespace-identifier-name-a"`,
+        parserOptions: { ecmaVersion: 2022 },
+        filename: testFilePath('./no-unused-modules/arbitrary-module-namespace-identifier-name-b.js'),
+      })),
+      testVersion('>= 8.7', () => ({
+        options: unusedExportsOptions,
+        code: 'const foo = 333;\nexport { foo as "foo" }',
+        parserOptions: { ecmaVersion: 2022 },
+        filename: testFilePath('./no-unused-modules/arbitrary-module-namespace-identifier-name-a.js'),
+      })),
+    ),
+    invalid: [].concat(
+      testVersion('>= 8.7', () => ({
+        options: unusedExportsOptions,
+        code: 'const foo = 333\nexport { foo as "foo" }',
+        parserOptions: { ecmaVersion: 2022 },
+        filename: testFilePath('./no-unused-modules/arbitrary-module-namespace-identifier-name-c.js'),
+        errors: [
+          error(`exported declaration 'foo' not used within other modules`),
+        ],
+      })),
+    ),
+  });
+});