lint: migrate to eslint flat config

Signed-off-by: JP-Ellis <josh@jpellis.me>

Author: JP-Ellis

.eslintignore

@@ -0,0 +1,18 @@
+// @ts-check
+
+import eslint from '@eslint/js';
+import tseslint from 'typescript-eslint';
+
+import importPlugin from 'eslint-plugin-import';
+import chaiFriendly from 'eslint-plugin-chai-friendly';
+import mochaPlugin from 'eslint-plugin-mocha';
+import eslintConfigPrettier from 'eslint-config-prettier/flat';
+
+export default tseslint.config(
+  eslint.configs.recommended,
+  tseslint.configs.recommended,
+  mochaPlugin.configs.recommended,
+  importPlugin.flatConfigs.recommended,
+  chaiFriendly.configs.recommendedFlat,
+  eslintConfigPrettier
+);