synv/eslint.config.ts at main · dak-engineering/synv · GitHub

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import path from 'node:path'
import { fileURLToPath } from 'node:url'
import js from '@eslint/js'
import eslintConfigPrettier from 'eslint-config-prettier'
import eslintPluginPrettier from 'eslint-plugin-prettier'
import { defineConfig, globalIgnores } from 'eslint/config'
import tseslint from 'typescript-eslint'

import { noAnyExceptInGenerics } from './eslint/no-any-except-in-generics'

// -----------------------------------------------------------------------------------------
// Helpers
// -----------------------------------------------------------------------------------------
const __filename = fileURLToPath(import.meta.url)
const __dirname = path.dirname(__filename)

// -----------------------------------------------------------------------------------------
// Export the flat config array using the `typescript-eslint` helper. This automatically
// wires up the correct parser/plugin and exposes the `strictTypeChecked` preset.
// -----------------------------------------------------------------------------------------
export default defineConfig(
	globalIgnores(['node_modules/**', '**/dist', '**/*.js']),

	// Base JavaScript rules.
	js.configs.recommended,

	// TypeScript rules - start with the recommended set and then enable the strict
	// type-checked variant which performs full program-level analysis.
	...tseslint.configs.recommended,
	...tseslint.configs.strictTypeChecked,

	// Disable strict type checking for custom ESLint rules
	{
		files: ['eslint/**/*.ts'],
		rules: {
			'@typescript-eslint/no-unsafe-assignment': 'off',
			'@typescript-eslint/no-unsafe-call': 'off',
			'@typescript-eslint/no-unsafe-member-access': 'off',
			'@typescript-eslint/no-unsafe-argument': 'off',
			'@typescript-eslint/no-explicit-any': 'off',
			'@typescript-eslint/restrict-template-expressions': 'off',
			'@typescript-eslint/ban-ts-comment': 'off',
		},
	},

	// Provide project-aware parsing so that the strict presets have full type info.
	{
		languageOptions: {
			parserOptions: {
				projectService: true,
				tsconfigRootDir: __dirname,
			},
		},
	},

	// Prettier plugin + our opinionated overrides.
	{
		plugins: {
			prettier: eslintPluginPrettier,
		},
		rules: {
			'prettier/prettier': 'error',

			'newline-before-return': 'error',

			// ----------------------------------------------------------------------
			// Existing project-specific rule tweaks
			// ----------------------------------------------------------------------
			camelcase: 'off',
			'import/prefer-default-export': 'off',

			// Align with previous configuration - soften a few rules that are too strict
			'no-use-before-define': 'off',
			'@typescript-eslint/no-var-requires': 'off',
			'@typescript-eslint/explicit-function-return-type': 'off',
			'@typescript-eslint/explicit-module-boundary-types': 'off',
			'@typescript-eslint/no-misused-promises': [
				'error',
				{
					checksVoidReturn: false,
				},
			],
			'@typescript-eslint/no-use-before-define': [
				'error',
				{
					functions: false,
				},
			],

			// TypeScript-specific relaxations
			'@typescript-eslint/no-unused-vars': [
				'error',
				{
					argsIgnorePattern: '^_',
					varsIgnorePattern: '^_',
				},
			],
			'@typescript-eslint/no-explicit-any': 'off',
		},
	},

	eslintConfigPrettier,

	// Custom configs
	defineConfig({
		files: ['src/**/*.ts'],
		ignores: ['src/**/*.dts.ts'],
		plugins: {
			'@nuances': {
				rules: {
					'no-any-except-in-generics': noAnyExceptInGenerics,
				},
			},
		},
		rules: {
			'@nuances/no-any-except-in-generics': 'error',
		},
	}),
)