Update to eslint 9 and ts-eslint 8

Fixes #75

Author: sweepline

README.md

@@ -4,15 +4,11 @@ Find and remove unused es6 module imports. It works by splitting up the `no-unus
 
 ## _Versions_
 
+-   Version 4.x.x is for eslint 9 with @typescript-eslint/eslint-plugin 8
 -   Version 3.x.x is for eslint 8 with @typescript-eslint/eslint-plugin 6 - 7
 -   Version 2.x.x is for eslint 8 with @typescript-eslint/eslint-plugin 5
 -   Version 1.x.x is for eslint 6 and 7.
 
-## _Important for version 1.1_
-
-The `-ts` rules are deprecated, the package now looks for `@typescript-eslint/eslint-plugin` to exist to decide between the typescript and eslint version.
-The `-ts` rule will still work, but point to the new rule instead.
-
 ## Typescript
 
 If running typescript with [@typescript-eslint](https://github.com/typescript-eslint/typescript-eslint) make sure to use both `@typescript-eslint/eslint-plugin` and `@typescript-eslint/parser`.
@@ -39,20 +35,18 @@ npm install eslint-plugin-unused-imports --save-dev
 
 ## Usage
 
-Add `unused-imports` to the plugins section of your `.eslintrc` configuration file. You can omit the `eslint-plugin-` prefix:
+Add `unused-imports` to the plugins section of your `.eslintrc` configuration file.
 
 ```jsonc
-{
-	"plugins": [<other_plugins_you_use>, "unused-imports"]
-}
-```
-
-Then configure the rules you want to use under the rules section. I can recommend adding a check for underscores, e.g.
+import unusedImports from "eslint-plugin-unused-imports";
 
-```jsonc
-{
-    "rules": {
-        "no-unused-vars": "off", // or "@typescript-eslint/no-unused-vars": "off",
+export default [{
+    plugins: {
+        "unused-imports": unusedImports,
+    },
+    rules: {
+       "no-unused-vars": "off",
+        "@typescript-eslint/no-unused-vars": "off",
         "unused-imports/no-unused-imports": "error",
         "unused-imports/no-unused-vars": [
             "warn",
@@ -62,9 +56,9 @@ Then configure the rules you want to use under the rules section. I can recommen
                 "args": "after-used",
                 "argsIgnorePattern": "^_",
             },
-        ],
-    },
-}
+        ]
+    }
+}];
 ```
 
 ## Supported Rules

lib/__test__/no-unused-imports-ts.test.js

@@ -1,8 +1,9 @@
 RuleTester = require("eslint").RuleTester;
+const tsParser = require("@typescript-eslint/parser");
 
 const ruleTester = new RuleTester({
-    parser: require.resolve('@typescript-eslint/parser'),
-    parserOptions: {
+    languageOptions: {
+        parser: tsParser,
         ecmaVersion: 2015,
         sourceType: "module",
     },

lib/__test__/no-unused-imports.test.js

@@ -1,7 +1,7 @@
 RuleTester = require("eslint").RuleTester;
 
 const ruleTester = new RuleTester({
-    parserOptions: { ecmaVersion: 2015, sourceType: "module" },
+    languageOptions: { ecmaVersion: 2015, sourceType: "module" },
 });
 
 const cases = require("./cases");

lib/index.js

@@ -7,10 +7,15 @@
 const noUnusedVars = require("./rules/no-unused-vars");
 const noUnusedImports = require("./rules/no-unused-imports");
 
-// import all rules in lib/rules
-module.exports.rules = {
-    "no-unused-vars": noUnusedVars,
-    "no-unused-imports": noUnusedImports,
-    "no-unused-vars-ts": noUnusedVars,
-    "no-unused-imports-ts": noUnusedImports,
+const plugin = {
+    meta: {},
+    configs: {},
+    rules: {
+        "no-unused-vars": noUnusedVars,
+        "no-unused-imports": noUnusedImports,
+    },
+    processors: {},
 };
+
+// import all rules in lib/rules
+module.exports = plugin;

lib/rules/load-rule.js

@@ -7,6 +7,6 @@ try {
     rule = tslint.rules["no-unused-vars"];
 } catch (_) {
     const eslint = require("eslint");
-    rule = new eslint.Linter().getRules().get("no-unused-vars");
+    rule = new eslint.Linter({ configType: "eslintrc" }).getRules().get("no-unused-vars");
 }
 module.exports = rule;