feat: add transform for v9 migration

README.md

@@ -23,7 +23,6 @@ Where:
 
 `path` - Files or directory to transform.
 
-
 For more information on jscodeshift, check their official [docs](https://github.com/facebook/jscodeshift).
 
 ## Transforms
@@ -49,3 +48,76 @@ module.exports = {
  create: function(context) { ... }
 };
 ```
+
+### v9-rule-migration
+
+Transform that migrates an ESLint rule definition from the old Rule API:
+
+```javascript
+module.exports = {
+    create(context) {
+        return {
+            Program(node) {
+                const sourceCode = context.getSourceCode();
+                const cwd = context.getCwd();
+                const filename = context.getFilename();
+                const physicalFilename = context.getPhysicalFilename();
+                const sourceCodeText = context.getSource();
+                const sourceLines = context.getSourceLines();
+                const allComments = context.getAllComments();
+                const nodeByRangeIndex = context.getNodeByRangeIndex();
+                const commentsBefore = context.getCommentsBefore(node);
+                const commentsAfter = context.getCommentsAfter(node);
+                const commentsInside = context.getCommentsInside(node);
+                const jsDocComment = context.getJSDocComment();
+                const firstToken = context.getFirstToken(node);
+                const firstTokens = context.getFirstTokens(node);
+                const lastToken = context.getLastToken(node);
+                const lastTokens = context.getLastTokens(node);
+                const tokenAfter = context.getTokenAfter(node);
+                const tokenBefore = context.getTokenBefore(node);
+                const tokenByRangeStart = context.getTokenByRangeStart(node);
+                const getTokens = context.getTokens(node);
+                const tokensAfter = context.getTokensAfter(node);
+                const tokensBefore = context.getTokensBefore(node);
+                const tokensBetween = context.getTokensBetween(node);
+                const parserServices = context.parserServices;
+            },
+        };
+    },
+};
+```
+
+to the new [Rule API introduced in ESLint 9.0.0](https://eslint.org/blog/2023/09/preparing-custom-rules-eslint-v9/):
+
+```javascript
+module.exports = {
+    create(context) {
+        const sourceCode = context.sourceCode ?? context.getSourceCode();
+        return {
+            Program(node) {
+                const sourceCodeText = sourceCode.getText();
+                const sourceLines = sourceCode.getLines();
+                const allComments = sourceCode.getAllComments();
+                const nodeByRangeIndex = sourceCode.getNodeByRangeIndex();
+                const commentsBefore = sourceCode.getCommentsBefore(nodeOrToken);
+                const commentsAfter = sourceCode.getCommentsAfter(nodeOrToken);
+                const commentsInside = sourceCode.getCommentsInside(nodeOrToken);
+                const jsDocComment = sourceCode.getJSDocComment();
+                const firstToken = sourceCode.getFirstToken(node);
+                const firstTokens = sourceCode.getFirstTokens(node);
+                const lastToken = sourceCode.getLastToken(node);
+                const lastTokens = sourceCode.getLastTokens(node);
+                const tokenAfter = sourceCode.getTokenAfter(node);
+                const tokenBefore = sourceCode.getTokenBefore(node);
+                const tokenByRangeStart = sourceCode.getTokenByRangeStart(node);
+                const getTokens = sourceCode.getTokens(node);
+                const tokensAfter = sourceCode.getTokensAfter(node);
+                const tokensBefore = sourceCode.getTokensBefore(node);
+                const tokensBetween = sourceCode.getTokensBetween(node);
+                const parserServices = sourceCode.parserServices;
+            },
+        };
+    },
+};
+```