Upgrade to eslint flat config

Author: annervisser

e2e-test/.eslintrc.js

@@ -0,0 +1,37 @@
+import globals from 'globals';
+import pluginJs from '@eslint/js';
+import tseslint from 'typescript-eslint';
+import playwright from 'eslint-plugin-playwright';
+import eslintConfigPrettier from 'eslint-config-prettier';
+
+/** @type { import("eslint").Linter.Config[] } */
+export default [
+	{ files: ['**/*.{js,mjs,cjs,ts}'] },
+	// eslint-disable-next-line @typescript-eslint/no-unsafe-assignment,@typescript-eslint/no-unsafe-member-access
+	{ languageOptions: { globals: globals.node } },
+	// eslint-disable-next-line @typescript-eslint/no-unsafe-member-access
+	pluginJs.configs.recommended,
+	eslintConfigPrettier,
+	playwright.configs['flat/recommended'],
+	...tseslint.configs.strictTypeChecked,
+	{
+		languageOptions: {
+			parserOptions: {
+				projectService: {
+					allowDefaultProject: ['eslint.config.mjs'],
+				},
+				tsconfigRootDir: import.meta.dirname,
+			},
+		},
+	},
+	{
+		rules: {
+			'@typescript-eslint/no-unused-vars': [
+				'error',
+				{
+					argsIgnorePattern: '^_',
+				},
+			],
+		},
+	},
+];

e2e-test/eslint.config.mjs

@@ -18,8 +18,6 @@ export class CLI {
 		await this.page.keyboard.press(key);
 	}
 
-	async command(command: string): Promise<void>;
-	async command(commands: string[]): Promise<void>;
 	async command(commands: string | string[]): Promise<void> {
 		commands = typeof commands === 'string' ? [commands] : commands;
 		for (const command of commands) {
@@ -34,6 +32,6 @@ export class CLI {
 
 	async assertExitCode(code: number) {
 		await this.command('echo $?'); // get exit code
-		await expect(this.lineN(-2)).toHaveText(`${code}`);
+		await expect(this.lineN(-2)).toHaveText(code.toString());
 	}
 }

e2e-test/helpers/CLI.ts

@@ -1,7 +1,7 @@
 import { expect, test as base } from '@playwright/test';
 import { CLI } from '@helpers/CLI';
 
-export const test = base.extend<{ cli: CLI; _tmpdir: void }>({
+export const test = base.extend<{ cli: CLI; _tmpdir: undefined }>({
 	cli: async ({ page }, use) => {
 		await page.goto('/');
 		await expect(page).toHaveTitle(/bash/);

e2e-test/helpers/cli-test.ts

@@ -11,14 +11,20 @@
 		"fix:prettier": "prettier --write ."
 	},
 	"devDependencies": {
+		"@eslint/js": "^9.10.0",
 		"@playwright/test": "1.47.1",
+		"@types/eslint": "^9.6.1",
+		"@types/eslint__js": "^8.42.3",
 		"@types/node": "20.16.5",
 		"@typescript-eslint/eslint-plugin": "8.6.0",
 		"@typescript-eslint/parser": "8.6.0",
-		"eslint": "9.10.0",
+		"eslint": "^9.10.0",
 		"eslint-config-prettier": "9.1.0",
 		"eslint-plugin-playwright": "1.6.2",
+		"globals": "^15.9.0",
 		"npm-run-all2": "6.2.3",
-		"prettier": "3.3.3"
+		"prettier": "3.3.3",
+		"typescript": "^5.6.2",
+		"typescript-eslint": "^8.6.0"
 	}
 }