Migrate eslint to flat config

.eslintignore

@@ -1,2 +0,0 @@
-dist
-node_modules

.eslintrc.js

@@ -1,10 +0,0 @@
-module.exports = {
-  root: true,
-  parser: "@typescript-eslint/parser",
-  plugins: ["@typescript-eslint"],
-  extends: [
-    "eslint:recommended",
-    "plugin:@typescript-eslint/recommended",
-    "prettier",
-  ],
-};

eslint.config.mjs

@@ -0,0 +1,27 @@
+import { FlatCompat } from "@eslint/eslintrc";
+import path from "path";
+import { fileURLToPath } from "url";
+import ts from "@typescript-eslint/eslint-plugin";
+import js from "@eslint/js";
+import parser from "@typescript-eslint/parser";
+
+const __filename = fileURLToPath(import.meta.url);
+const __dirname = path.dirname(__filename);
+
+const compat = new FlatCompat({
+    baseDirectory: __dirname
+});
+
+export default [
+  js.configs.recommended,
+    ...compat.extends("plugin:@typescript-eslint/recommended"),
+    ...compat.extends("prettier"),
+  {
+    ignores: [ "jest.config.js", "node_modules/*" ],
+    files: [ "**/*.ts" ],
+    languageOptions: {
+      parser: parser,
+    },
+    plugins: { "@typescript-eslint": ts },
+  }
+];

jest.config.js

@@ -1,3 +1,4 @@
+/* eslint-disable */
 const { compilerOptions }  = require("./tsconfig.json");
 
 /** @type {import('ts-jest/dist/types').InitialOptionsTsJest} */

package.json

@@ -13,8 +13,8 @@
   },
   "scripts": {
     "clean": "yarn cache clean && rm -rf dist",
-    "lint": "yarn run eslint . --ext .ts",
+    "lint": "yarn run eslint .",
-    "lint:fix": "yarn run eslint --fix . --ext .ts",
+    "lint:fix": "yarn run eslint --fix .",
     "format:check": "yarn run prettier --check src/**",
     "format": "yarn run prettier --write src/**",
     "test": "yarn jest",

src/__test__/guards.test.ts

@@ -2,7 +2,6 @@ import { Err, Ok } from "..";
 import { isResult, __internals } from "../guards";
 
 describe("guards.ts", () => {
-  /* eslint-disable @typescript-eslint/no-empty-function */
   const combinators = {
     and: () => {},
     andThen: () => {},
@@ -16,7 +15,6 @@ describe("guards.ts", () => {
     yieldOr: () => {},
     yieldOrElse: () => {},
   };
-  /* eslint-enable */
 
   const mockSuccess = {
     kind: "ok",

src/index.ts

@@ -213,7 +213,6 @@ export namespace Result {
       return this;
     }
 
-    // eslint-disable-next-line @typescript-eslint/no-unused-vars
     yieldOr<U>(_: U, f: (t: T) => U): Result<U, never> {
       return this.yield(f);
     }