feature: no-unused-modules: try-catch: remove all nesting

Author: coderaiser

package.json

@@ -114,6 +114,7 @@
     "pkg-up": "^2.0.0",
     "read-pkg-up": "^3.0.0",
     "resolve": "^1.20.0",
+    "try-catch": "^3.0.0",
     "tsconfig-paths": "^3.9.0"
   }
 }

src/rules/no-unused-modules.js

@@ -14,52 +14,56 @@ import values from 'object.values';
 import includes from 'array-includes';
 import tryCatch from 'try-catch';
 
+let listFilesToProcess;
+
 const [, eslint8] = tryCatch(require, 'eslint/use-at-your-own-risk');
+// has been moved to eslint/lib/cli-engine/file-enumerator in version 6
 const [, eslint7] = tryCatch(require, 'eslint/lib/cli-engine/file-enumerator');
+// eslint/lib/util/glob-util has been moved to eslint/lib/util/glob-utils with version 5.3
 const [, eslint6] = tryCatch(require, 'eslint/lib/util/glob-utils');
 const [, eslint5] = tryCatch(require, 'eslint/lib/util/glob-util');
 
 const modernESLint = eslint8 || eslint7;
 
 if (modernESLint) {
-    // eslint/lib/util/glob-util has been moved to eslint/lib/util/glob-utils with version 5.3
-    // and has been moved to eslint/lib/cli-engine/file-enumerator in version 6
-    const {FileEnumerator} = modernESLint;
+  const { FileEnumerator } = modernESLint;
 
-     listFilesToProcess = function (src, extensions) {
-        const e = new FileEnumerator({
-          extensions: extensions,
-        });
+  listFilesToProcess = function (src, extensions) {
+    const e = new FileEnumerator({
+      extensions: extensions,
+    });
 
-        return Array.from(e.iterateFiles(src), ({ filePath, ignored }) => ({
-          ignored,
-          filename: filePath,
-        }));
+    return Array.from(e.iterateFiles(src), ({ filePath, ignored }) => ({
+      ignored,
+      filename: filePath,
+    }));
+  };
+}
+
+// Prevent passing invalid options (extensions array) to old versions of the function.
+// https://github.com/eslint/eslint/blob/v5.16.0/lib/util/glob-utils.js#L178-L280
+// https://github.com/eslint/eslint/blob/v5.2.0/lib/util/glob-util.js#L174-L269
+if (eslint6) {
+  const originalListFilesToProcess = eslint6.listFilesToProcess;
+  listFilesToProcess = function (src, extensions) {
+    return originalListFilesToProcess(src, {
+      extensions: extensions,
+    });
   };
 }
-  
-    if (eslin6) {
-         originalListFilesToProcess = eslin6.listFilesToProcess;
-        listFilesToProcess = function (src, extensions) {
-          return originalListFilesToProcess(src, {
-            extensions: extensions,
-          });
-        };
-    }
-    
-    if (eslin5) {
-          originalListFilesToProcess = eslint5.listFilesToProcess;
 
-    listFilesToProcess = function (src, extensions) {
-      const patterns = src.reduce((carry, pattern) => {
-        return carry.concat(extensions.map((extension) => {
-          return /\*\*|\*\./.test(pattern) ? pattern : `${pattern}/**/*${extension}`;
-        }));
-      }, src.slice());
+if (eslint5) {
+  const originalListFilesToProcess = eslint5.listFilesToProcess;
 
-      return originalListFilesToProcess(patterns);
-    };
-  }
+  listFilesToProcess = function (src, extensions) {
+    const patterns = src.reduce((carry, pattern) => {
+      return carry.concat(extensions.map((extension) => {
+        return /\*\*|\*\./.test(pattern) ? pattern : `${pattern}/**/*${extension}`;
+      }));
+    }, src.slice());
+
+    return originalListFilesToProcess(patterns);
+  };
 }
 
 const EXPORT_DEFAULT_DECLARATION = 'ExportDefaultDeclaration';
@@ -236,7 +240,7 @@ const prepareImportsAndExports = (srcFiles, context) => {
         }
         const localImport = imports.get(key) || new Set();
         value.declarations.forEach(({ importedSpecifiers }) =>
-          importedSpecifiers.forEach(specifier => localImport.add(specifier))
+          importedSpecifiers.forEach(specifier => localImport.add(specifier)),
         );
         imports.set(key, localImport);
       });
@@ -552,13 +556,13 @@ module.exports = {
         if (exportStatement.whereUsed.size < 1) {
           context.report(
             node,
-            `exported declaration '${value}' not used within other modules`
+            `exported declaration '${value}' not used within other modules`,
           );
         }
       } else {
         context.report(
           node,
-          `exported declaration '${value}' not used within other modules`
+          `exported declaration '${value}' not used within other modules`,
         );
       }
     };