prefer-w: Add support for v flag (#578)

* `prefer-w`: Add support for `v` flag

* Use new `UnicodeSet` API

* Create tasty-penguins-cheat.md

---------

Co-authored-by: Yosuke Ota <[email protected]>

Author: RunDevelopment

.changeset/tasty-penguins-cheat.md

@@ -0,0 +1,5 @@
+---
+"eslint-plugin-regexp": minor
+---
+
+`prefer-w`: Add support for `v` flag

lib/rules/prefer-w.ts

@@ -16,7 +16,7 @@ import {
     CP_DIGIT_NINE,
     CP_LOW_LINE,
 } from "../utils"
-import { Chars, toCharSet } from "regexp-ast-analysis"
+import { Chars, toUnicodeSet } from "regexp-ast-analysis"
 import { mention } from "../utils/mention"
 
 function isSmallLetterRange(node: CharacterClassElement) {
@@ -40,7 +40,7 @@ function isDigitRangeOrSet(node: CharacterClassElement) {
         (node.type === "CharacterClassRange" &&
             node.min.value === CP_DIGIT_ZERO &&
             node.max.value === CP_DIGIT_NINE) ||
-        (node.type === "CharacterSet" && node.kind === "digit")
+        (node.type === "CharacterSet" && node.kind === "digit" && !node.negate)
     )
 }
 
@@ -73,14 +73,13 @@ export default createRule("prefer-w", {
         }: RegExpContext): RegExpVisitor.Handlers {
             return {
                 onCharacterClassEnter(ccNode: CharacterClass) {
-                    // FIXME: TS Error
-                    // @ts-expect-error -- FIXME
-                    const charSet = toCharSet(ccNode, flags)
+                    const charSet = toUnicodeSet(ccNode, flags)
 
                     let predefined: string | undefined = undefined
-                    if (charSet.equals(Chars.word(flags))) {
+                    const word = Chars.word(flags)
+                    if (charSet.equals(word)) {
                         predefined = "\\w"
-                    } else if (charSet.equals(Chars.word(flags).negate())) {
+                    } else if (charSet.equals(word.negate())) {
                         predefined = "\\W"
                     }
 

tests/lib/rules/prefer-w.ts

@@ -3,13 +3,13 @@ import rule from "../../../lib/rules/prefer-w"
 
 const tester = new RuleTester({
     parserOptions: {
-        ecmaVersion: 2020,
+        ecmaVersion: "latest",
         sourceType: "module",
     },
 })
 
 tester.run("prefer-w", rule as any, {
-    valid: ["/\\w/"],
+    valid: ["/\\w/", "/[\\Da-zA-Z_#]/", "/\\w/v", "/[\\Da-zA-Z_#]/v"],
     invalid: [
         {
             code: "/[0-9a-zA-Z_]/",
@@ -35,6 +35,20 @@ tester.run("prefer-w", rule as any, {
                 },
             ],
         },
+        {
+            code: "/[\\da-zA-Z_#]/",
+            output: "/[\\w#]/",
+            errors: [
+                "Unexpected character class ranges '[\\da-zA-Z_]'. Use '\\w' instead.",
+            ],
+        },
+        {
+            code: "/[0-9a-z_[\\s&&\\p{ASCII}]]/iv",
+            output: "/[\\w[\\s&&\\p{ASCII}]]/iv",
+            errors: [
+                "Unexpected character class ranges '[0-9a-z_]'. Use '\\w' instead.",
+            ],
+        },
         {
             code: "/[0-9a-z_]/i",
             output: "/\\w/i",