Feature/eslint config migration

.changeset/twelve-files-train.md

@@ -0,0 +1,5 @@
+---
+"@atomicsmash/coding-standards": minor
+---
+
+Add beta flat config for ESLint

packages/coding-standards/beta/eslint/index.js

@@ -0,0 +1,165 @@
+const OFF = 0;
+const WARN = 1;
+const ERROR = 2;
+
+import js from "@eslint/js";
+import esLintComments from "@eslint-community/eslint-plugin-eslint-comments";
+import { defineConfig } from "eslint/config";
+import importPlugin from "eslint-plugin-import";
+import { playwrightConfigs } from "eslint-plugin-playwright";
+import reactPlugin from "eslint-plugin-react";
+import reactHooksPlugin from "eslint-plugin-react-hooks";
+import globals from "globals";
+import tseslint from "typescript-eslint";
+
+export const config = defineConfig([
+	{
+		files: [
+			"**/*.js",
+			"**/*.cjs",
+			"**/*.mjs",
+			"**/*.ts",
+			"**/*.cts",
+			"**/*.mts",
+		],
+		extends: [
+			js.configs.recommended,
+			esLintComments.configs.recommended,
+			tseslint.configs.strictTypeChecked,
+			tseslint.configs.stylisticTypeChecked,
+			importPlugin.flatConfigs.typescript,
+		],
+		plugins: {
+			"@typescript-eslint": tseslint.plugin,
+			import: importPlugin,
+		},
+		languageOptions: {
+			ecmaVersion: 2022,
+			sourceType: "module",
+			globals: {
+				...globals.browser,
+				...globals.node,
+			},
+			parser: tseslint.parser,
+			parserOptions: {
+				projectService: true,
+			},
+		},
+		rules: {
+			"no-case-declarations": [OFF],
+			"import/order": [
+				ERROR,
+				{
+					alphabetize: {
+						order: "asc",
+					},
+					groups: [
+						"type",
+						"builtin",
+						"external",
+						"internal",
+						"parent",
+						["sibling", "index"],
+					],
+					"newlines-between": "ignore",
+					pathGroups: [],
+					pathGroupsExcludedImportTypes: [],
+				},
+			],
+			"prefer-const": [ERROR],
+			"no-var": [ERROR],
+			"import/no-duplicates": WARN,
+			"eslint-comments/no-unused-disable": [ERROR],
+			"eslint-comments/require-description": [
+				ERROR,
+				{ ignore: ["eslint-enable"] },
+			],
+			"@typescript-eslint/naming-convention": [
+				ERROR,
+				{
+					selector: "variableLike",
+					format: ["camelCase", "PascalCase", "UPPER_CASE"],
+					leadingUnderscore: "allow",
+				},
+				{ selector: "function", format: ["camelCase", "PascalCase"] },
+				{ selector: "typeLike", format: ["PascalCase"] },
+				{
+					selector: "variable",
+					types: ["boolean"],
+					format: ["PascalCase"],
+					prefix: ["is", "should", "has", "can", "did", "will", "are"],
+					leadingUnderscore: "allow",
+				},
+			],
+			"@typescript-eslint/consistent-type-definitions": [ERROR, "type"],
+			"@typescript-eslint/non-nullable-type-assertion-style": OFF,
+			"@typescript-eslint/no-unused-vars": [
+				ERROR,
+				{
+					args: "all",
+					argsIgnorePattern: "^_",
+					caughtErrors: "all",
+					caughtErrorsIgnorePattern: "^_",
+					destructuredArrayIgnorePattern: "^_",
+					varsIgnorePattern: "^_",
+					ignoreRestSiblings: true,
+				},
+			],
+		},
+	},
+	{
+		files: ["*.cjs"],
+		languageOptions: {
+			sourceType: "commonjs",
+		},
+	},
+	{
+		files: ["*.mjs"],
+		languageOptions: {
+			sourceType: "module",
+		},
+	},
+	{
+		files: ["**/*.test.*"],
+		rules: {
+			"@typescript-eslint/no-unused-vars": [OFF],
+		},
+	},
+	{
+		files: ["**/*.jsx", "**/*.tsx"],
+		extends: [
+			reactPlugin.configs.flat.recommended,
+			reactPlugin.configs.flat["jsx-runtime"],
+			reactHooksPlugin.configs.flat["recommended-latest"],
+		],
+		settings: {
+			react: {
+				version: "detect",
+			},
+		},
+		rules: {
+			"react-hooks/exhaustive-deps": [
+				WARN,
+				{
+					additionalHooks: "(useSelect|useSuspenseSelect)",
+				},
+			],
+		},
+	},
+]);
+
+export const playwrightConfig = defineConfig([
+	{
+		extends: [playwrightConfigs["flat/recommended"]],
+		rules: {
+			"playwright/expect-expect": [
+				ERROR,
+				{
+					assertFunctionNames: [
+						"playAudit", // This is the lighthouse playwright test, which contains threshold assertions.
+					],
+				},
+			],
+		},
+	},
+]);