fix(sort-character-class-elements): wrong fix for ^ (#859)

* fix(sort-character-class-elements): wrong fix for `^`

* Create spicy-rats-invent.md

Author: ota-meshi

.changeset/spicy-rats-invent.md

@@ -0,0 +1,5 @@
+---
+"eslint-plugin-regexp": patch
+---
+
+fix(sort-character-class-elements): wrong autofix for `^`

lib/rules/sort-character-class-elements.ts

@@ -296,6 +296,15 @@ function escapeRaw(node: CharacterClassElement, target: CharacterClassElement) {
         ) {
             raw = `\\${raw}`
         }
+    } else if (raw.startsWith("^")) {
+        const parent = target.parent as CharacterClass
+        const elements: (
+            | UnicodeSetsCharacterClassElement
+            | ClassRangesCharacterClassElement
+        )[] = parent.elements
+        if (elements.indexOf(target) === 0) {
+            raw = `\\${raw}`
+        }
     }
     if (target.raw.startsWith("-")) {
         if (node.type === "Character" || node.type === "CharacterSet") {

tests/lib/rules/__snapshots__/sort-character-class-elements.ts.eslintsnap

@@ -375,3 +375,29 @@ Output:
 
 [1] Expected character class elements to be in ascending order. '\q{aa}' should be before '\q{ab}'.
 ---
+
+
+Test: sort-character-class-elements >> invalid
+Code:
+  1 | /[~^*]/
+    |    ^ [1]
+    |     ^ [2]
+
+Output:
+  1 | /[*\^~]/
+
+[1] Expected character class elements to be in ascending order. '^' should be before '~'.
+[2] Expected character class elements to be in ascending order. '*' should be before '~'.
+---
+
+
+Test: sort-character-class-elements >> invalid
+Code:
+  1 | /[~^]/
+    |    ^ [1]
+
+Output:
+  1 | /[\^~]/
+
+[1] Expected character class elements to be in ascending order. '^' should be before '~'.
+---

tests/lib/rules/sort-character-class-elements.ts

@@ -96,5 +96,7 @@ tester.run("sort-character-class-elements", rule as any, {
         String.raw`/[\q{b}\q{c}\q{a}]/v`,
         String.raw`/[\q{ac}\q{ab}\q{aa}]/v`,
         String.raw`/[\q{ab}\q{ac}\q{aa}]/v`,
+        String.raw`/[~^*]/`,
+        String.raw`/[~^]/`,
     ],
 })