Add support for v flag to regexp/optimal-quantifier-concatenation (#618)

* Add support for `v` flag to `regexp/optimal-quantifier-concatenation`

* Create beige-suns-clap.md

Author: RunDevelopment

.changeset/beige-suns-clap.md

@@ -0,0 +1,5 @@
+---
+"eslint-plugin-regexp": minor
+---
+
+Add support for `v` flag to `regexp/optimal-quantifier-concatenation`

lib/rules/optimal-quantifier-concatenation.ts

@@ -18,8 +18,8 @@ import type { Ancestor, ReadonlyFlags } from "regexp-ast-analysis"
 import {
     Chars,
     hasSomeDescendant,
-    toCharSet,
     getConsumedChars,
+    toUnicodeSet,
 } from "regexp-ast-analysis"
 import { getParser } from "../utils/regexp-ast"
 import type { CharSet } from "refa"
@@ -76,13 +76,13 @@ function getSingleConsumedChar(
         case "Character":
         case "CharacterSet":
         case "CharacterClass":
-        case "ExpressionCharacterClass":
+        case "ExpressionCharacterClass": {
+            const set = toUnicodeSet(element, flags)
             return {
-                // FIXME: TS Error
-                // @ts-expect-error -- FIXME
-                char: toCharSet(element, flags),
-                complete: true,
+                char: set.chars,
+                complete: set.accept.isEmpty,
             }
+        }
 
         case "Group":
         case "CapturingGroup": {

tests/lib/rules/optimal-quantifier-concatenation.ts

@@ -3,7 +3,7 @@ import rule from "../../../lib/rules/optimal-quantifier-concatenation"
 
 const tester = new RuleTester({
     parserOptions: {
-        ecmaVersion: 2020,
+        ecmaVersion: "latest",
         sourceType: "module",
     },
 })
@@ -291,5 +291,26 @@ tester.run("optimal-quantifier-concatenation", rule as any, {
                 "'\\d*' can be removed because it is already included by '\\d+'. This cannot be fixed automatically because it involves a capturing group.",
             ],
         },
+        {
+            code: String.raw`/\d+(\d*)/v`,
+            output: null,
+            errors: [
+                "'\\d*' can be removed because it is already included by '\\d+'. This cannot be fixed automatically because it involves a capturing group.",
+            ],
+        },
+        {
+            code: String.raw`/a+[a\q{}]+/v`,
+            output: String.raw`/a+[a\q{}]/v`,
+            errors: [
+                "'[a\\q{}]+' can be replaced with '[a\\q{}]' because of 'a+'.",
+            ],
+        },
+        {
+            code: String.raw`/[ab]*[\q{a|bb}]+/v`,
+            output: String.raw`/[ab]*[\q{a|bb}]/v`,
+            errors: [
+                "'[\\q{a|bb}]+' can be replaced with '[\\q{a|bb}]' because of '[ab]*'.",
+            ],
+        },
     ],
 })