fix: incorrect warning message for ignored dotfiles (#17196)

Author: mdjermanovic

lib/eslint/eslint-helpers.js

@@ -591,13 +591,9 @@ function isErrorMessage(message) {
  */
 function createIgnoreResult(filePath, baseDir) {
     let message;
-    const isHidden = filePath.split(path.sep)
-        .find(segment => /^\./u.test(segment));
     const isInNodeModules = baseDir && path.relative(baseDir, filePath).startsWith("node_modules");
 
-    if (isHidden) {
-        message = "File ignored by default.  Use a negated ignore pattern (like \"--ignore-pattern '!<relative/path/to/filename>'\") to override.";
-    } else if (isInNodeModules) {
+    if (isInNodeModules) {
         message = "File ignored by default because it is located under the node_modules directory. Use ignore pattern \"!**/node_modules/\" to override.";
     } else {
         message = "File ignored because of a matching ignore pattern. Use \"--no-ignore\" to override.";

tests/lib/eslint/flat-eslint.js

@@ -1340,6 +1340,26 @@ describe("FlatESLint", () => {
                 assert.strictEqual(results[0].suppressedMessages.length, 0);
             });
 
+            it("should return a warning about matching ignore patterns when an explicitly given dotfile is ignored", async () => {
+                eslint = new FlatESLint({
+                    overrideConfigFile: "eslint.config_with_ignores.js",
+                    cwd: getFixturePath()
+                });
+                const filePath = getFixturePath("dot-files/.a.js");
+                const results = await eslint.lintFiles([filePath]);
+
+                assert.strictEqual(results.length, 1);
+                assert.strictEqual(results[0].filePath, filePath);
+                assert.strictEqual(results[0].messages[0].severity, 1);
+                assert.strictEqual(results[0].messages[0].message, "File ignored because of a matching ignore pattern. Use \"--no-ignore\" to override.");
+                assert.strictEqual(results[0].errorCount, 0);
+                assert.strictEqual(results[0].warningCount, 1);
+                assert.strictEqual(results[0].fatalErrorCount, 0);
+                assert.strictEqual(results[0].fixableErrorCount, 0);
+                assert.strictEqual(results[0].fixableWarningCount, 0);
+                assert.strictEqual(results[0].suppressedMessages.length, 0);
+            });
+
             it("should return two messages when given a file in excluded files list while ignore is off", async () => {
                 eslint = new FlatESLint({
                     cwd: getFixturePath(),