Fix #1259 for no-unresolved, add caseSensitiveStrict option

Author: sergei-startsev

docs/rules/no-unresolved.md

@@ -76,6 +76,22 @@ By default, this rule will report paths whose case do not match the underlying f
 const { default: x } = require('./foo') // reported if './foo' is actually './Foo' and caseSensitive: true
 ```
 
+#### `caseSensitiveStrict`
+
+`caseSensitive` option does not detect case for current working derectory, `caseSensitiveStrict` option allows to check `cwd` in resolved path. By default, the options is disabled.
+
+
+```js
+/*eslint import/no-unresolved: [2, { caseSensitiveStrict: true }]*/
+
+// Absolute paths
+import Foo from `/Users/fOo/bar/file.js` // reported, /Users/foo/bar/file.js
+import Foo from `d:/fOo/bar/file.js` // reported, d:/foo/bar/file.js
+
+// Relative paths, cwd is Users/foo/
+import Foo from `./../fOo/bar/file.js` // reported
+```
+
 ## When Not To Use It
 
 If you're using a module bundler other than Node or Webpack, you may end up with

src/rules/no-unresolved.js

@@ -18,14 +18,17 @@ module.exports = {
     schema: [
       makeOptionsSchema({
         caseSensitive: { type: 'boolean', default: true },
+        caseSensitiveStrict: { type: 'boolean', default: false },
       }),
     ],
   },
 
   create: function (context) {
+    const options = context.options[0] || {};
+
     function checkSourceValue(source) {
-      const shouldCheckCase = !CASE_SENSITIVE_FS
-        && (!context.options[0] || context.options[0].caseSensitive !== false);
+      const shouldCheckCase = !CASE_SENSITIVE_FS && options.caseSensitive !== false;
+      const caseSensitiveStrict = !CASE_SENSITIVE_FS && options.caseSensitiveStrict;
 
       const resolvedPath = resolve(source.value, context);
 
@@ -36,7 +39,7 @@ module.exports = {
         );
       } else if (shouldCheckCase) {
         const cacheSettings = ModuleCache.getSettings(context.settings);
-        if (!fileExistsWithCaseSync(resolvedPath, cacheSettings)) {
+        if (!fileExistsWithCaseSync(resolvedPath, cacheSettings, caseSensitiveStrict)) {
           context.report(
             source,
             `Casing of ${source.value} does not match the underlying filesystem.`
@@ -45,6 +48,6 @@ module.exports = {
       }
     }
 
-    return moduleVisitor(checkSourceValue, context.options[0]);
+    return moduleVisitor(checkSourceValue, options);
   },
 };

tests/src/core/resolve.js

@@ -319,7 +319,11 @@ describe('resolve', function () {
   const caseDescribe = (!CASE_SENSITIVE_FS ? describe : describe.skip);
   caseDescribe('case sensitivity', function () {
     let file;
-    const testContext = utils.testContext({ 'import/resolve': { 'extensions': ['.jsx'] } });
+    const testContext = utils.testContext({ 
+      'import/resolve': { 'extensions': ['.jsx'] },
+      'import/cache': { lifetime: 0 },
+    });
+    const testSettings = testContext.settings;
     before('resolve', function () {
       file = resolve(
       // Note the case difference 'MyUncoolComponent' vs 'MyUnCoolComponent'
@@ -329,14 +333,19 @@ describe('resolve', function () {
       expect(file, 'path to ./jsx/MyUncoolComponent').to.exist;
     });
     it('detects case does not match FS', function () {
-      expect(fileExistsWithCaseSync(file, ModuleCache.getSettings(testContext)))
+      expect(fileExistsWithCaseSync(file, testSettings))
         .to.be.false;
     });
     it('detecting case does not include parent folder path (issue #720)', function () {
       const f = path.join(process.cwd().toUpperCase(), './tests/files/jsx/MyUnCoolComponent.jsx');
-      expect(fileExistsWithCaseSync(f, ModuleCache.getSettings(testContext), true))
+      expect(fileExistsWithCaseSync(f, testSettings))
         .to.be.true;
     });
+    it('detecting case should include parent folder path', function () {
+      const f = path.join(process.cwd().toUpperCase(), './tests/files/jsx/MyUnCoolComponent.jsx');
+      expect(fileExistsWithCaseSync(f, testSettings, true))
+        .to.be.false;
+    });
   });
 
   describe('rename cache correctness', function () {

tests/src/rules/no-unresolved.js

@@ -15,7 +15,7 @@ function runResolverTests(resolver) {
   function rest(specs) {
     specs.settings = Object.assign({},
       specs.settings,
-      { 'import/resolver': resolver },
+      { 'import/resolver': resolver, 'import/cache': { lifetime: 0 }, }
     );
 
     return test(specs);
@@ -227,6 +227,10 @@ function runResolverTests(resolver) {
   });
 
   if (!CASE_SENSITIVE_FS) {
+    const relativePath = './tests/files/jsx/MyUnCoolComponent.jsx';
+    const cwd = process.cwd();
+    const mismatchedPath = path.join(cwd.toUpperCase(), relativePath).replace(/\\/g, '/');
+
     ruleTester.run('case sensitivity', rule, {
       valid: [
         rest({ // test with explicit flag
@@ -247,6 +251,24 @@ function runResolverTests(resolver) {
         }),
       ],
     });
+
+    ruleTester.run('case sensitivity strict', rule, {
+      valid: [
+        // #1259 issue
+        rest({ // caseSensitiveStrict is disabled by default
+          code: `import foo from "${mismatchedPath}"`,
+        }),
+      ],
+
+      invalid: [
+        // #1259 issue
+        rest({ // test with enabled caseSensitiveStrict option
+          code: `import foo from "${mismatchedPath}"`,
+          options: [{ caseSensitiveStrict: true }],
+          errors: [`Casing of ${mismatchedPath} does not match the underlying filesystem.`],
+        }),
+      ],
+    });
   }
 
 }

utils/resolve.js

@@ -52,13 +52,13 @@ function tryRequire(target, sourceFile) {
 }
 
 // http://stackoverflow.com/a/27382838
-exports.fileExistsWithCaseSync = function fileExistsWithCaseSync(filepath, cacheSettings) {
+exports.fileExistsWithCaseSync = function fileExistsWithCaseSync(filepath, cacheSettings, strict) {
   // don't care if the FS is case-sensitive
   if (CASE_SENSITIVE_FS) return true;
 
   // null means it resolved to a builtin
   if (filepath === null) return true;
-  if (filepath.toLowerCase() === process.cwd().toLowerCase()) return true;
+  if (filepath.toLowerCase() === process.cwd().toLowerCase() && !strict) return true;
   const parsedPath = path.parse(filepath);
   const dir = parsedPath.dir;
 
@@ -73,7 +73,7 @@ exports.fileExistsWithCaseSync = function fileExistsWithCaseSync(filepath, cache
     if (filenames.indexOf(parsedPath.base) === -1) {
       result = false;
     } else {
-      result = fileExistsWithCaseSync(dir, cacheSettings);
+      result = fileExistsWithCaseSync(dir, cacheSettings, strict);
     }
   }
   fileExistsCache.set(filepath, result);