fix(extensions): always calculate fix option

.changeset/angry-lions-learn.md

@@ -0,0 +1,5 @@
+---
+"eslint-plugin-import-x": patch
+---
+
+fix(extensions): always calculate `fix` option

docs/rules/extensions.md

@@ -4,6 +4,18 @@
 
 <!-- end auto-generated rule header -->
 
+> [!NOTE]
+>
+> This rule is only fixable when the `fix` option is set to `true` for compatibility, otherwise `suggestions` will be provided instead.
+>
+> Example:
+>
+> ```json
+> "import-x/extensions": ["error", "never", { "fix": true }]
+> ```
+>
+> It will change to be automatically fixable in the next major version.
+
 Some file resolve algorithms allow you to omit the file extension within the import source path. For example the `node` resolver (which does not yet support ESM/`import`) can resolve `./foo/bar` to the absolute path `/User/someone/foo/bar.js` because the `.js` extension is resolved automatically by default in CJS. Depending on the resolver you can configure more extensions to get resolved automatically.
 
 In order to provide a consistent use of file extensions across your code base, this rule can enforce or disallow the use of certain file extensions.

src/rules/extensions.ts

@@ -132,6 +132,10 @@ function buildProperties(context: RuleContext<MessageId, Options>) {
       continue
     }
 
+    if (obj.fix != null) {
+      result.fix = Boolean(obj.fix)
+    }
+
     // If this is not the new structure, transfer all props to result.pattern
     if (
       (!('pattern' in obj) || obj.pattern == null) &&
@@ -156,10 +160,6 @@ function buildProperties(context: RuleContext<MessageId, Options>) {
       result.checkTypeImports = obj.checkTypeImports
     }
 
-    if (obj.fix != null) {
-      result.fix = Boolean(obj.fix)
-    }
-
     if (Array.isArray(obj.pathGroupOverrides)) {
       result.pathGroupOverrides = obj.pathGroupOverrides
     }

test/rules/extensions.spec.ts

@@ -173,6 +173,83 @@ ruleTester.run('extensions', rule, {
   ],
 
   invalid: [
+    tInvalid({
+      name: 'extensions should provide suggestions by default',
+      code: 'import a from "./foo.js"',
+      options: ['never'],
+      errors: [
+        {
+          messageId: 'unexpected',
+          data: { extension: 'js', importPath: './foo.js' },
+          line: 1,
+          column: 15,
+          suggestions: [
+            {
+              messageId: 'removeUnexpected',
+              data: {
+                extension: 'js',
+                importPath: './foo.js',
+                fixedImportPath: './foo',
+              },
+              output: 'import a from "./foo"',
+            },
+          ],
+        },
+      ],
+    }),
+    tInvalid({
+      name: 'extensions should autofix when fix is set to true',
+      code: 'import a from "./foo.js"',
+      options: ['never', { fix: true }],
+      errors: [
+        {
+          messageId: 'unexpected',
+          data: { extension: 'js', importPath: './foo.js' },
+          line: 1,
+          column: 15,
+        },
+      ],
+      output: 'import a from "./foo"',
+    }),
+    tInvalid({
+      name: 'extensions should autofix when fix is set to true and a pattern object is provided',
+      code: 'import a from "./foo.js"',
+      options: ['never', { fix: true, pattern: {} }],
+      errors: [
+        {
+          messageId: 'unexpected',
+          data: { extension: 'js', importPath: './foo.js' },
+          line: 1,
+          column: 15,
+        },
+      ],
+      output: 'import a from "./foo"',
+    }),
+    tInvalid({
+      name: 'extensions should not autofix when fix is set to false',
+      code: 'import a from "./foo.js"',
+      options: ['never', { fix: false }],
+      errors: [
+        {
+          messageId: 'unexpected',
+          data: { extension: 'js', importPath: './foo.js' },
+          line: 1,
+          column: 15,
+          suggestions: [
+            {
+              messageId: 'removeUnexpected',
+              data: {
+                extension: 'js',
+                importPath: './foo.js',
+                fixedImportPath: './foo',
+              },
+              output: 'import a from "./foo"',
+            },
+          ],
+        },
+      ],
+      output: null,
+    }),
     tInvalid({
       code: 'import a from "a/index.js"',
       errors: [