Fix #1259 for no-unresolved, add caseSensitiveStrict option

Author: sergei-startsev

Diff for: 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

Diff for: src/rules/no-unresolved.js

@@ -17,14 +17,16 @@ 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)
 
@@ -35,15 +37,15 @@ 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.`)
         }
 
       }
     }
 
-    return moduleVisitor(checkSourceValue, context.options[0])
+    return moduleVisitor(checkSourceValue, options)
 
   },
 }

Diff for: tests/src/core/resolve.js

@@ -152,7 +152,11 @@ 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'
@@ -162,14 +166,19 @@ 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 () {

Diff for: 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)
@@ -203,12 +203,21 @@ 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
           code: 'import foo from "./jsx/MyUncoolComponent.jsx"',
           options: [{ caseSensitive: false }],
         }),
+        // #1259 issue
+        rest({ // test with explicit flag
+          code: `import foo from "${mismatchedPath}"`,
+          options: [{ caseSensitive: true }],
+        }),
       ],
 
       invalid: [
@@ -221,6 +230,12 @@ function runResolverTests(resolver) {
           options: [{ caseSensitive: true }],
           errors: [`Casing of ./jsx/MyUncoolComponent.jsx does not match the underlying filesystem.`],
         }),
+        // #1259 issue
+        rest({ // test with explicit flag
+          code: `import foo from "${mismatchedPath}"`,
+          options: [{ caseSensitiveStrict: true }],
+          errors: [`Casing of ${mismatchedPath} does not match the underlying filesystem.`],
+        }),
       ],
     })
   }

Diff for: utils/resolve.js

@@ -29,13 +29,13 @@ function tryRequire(target) {
 }
 
 // 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)
       , dir = parsedPath.dir
 
@@ -50,7 +50,7 @@ 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)