.eslintrc.extension.js

const path = require('path');

module.exports = {
	root: true,
	env: {
		node: true,
	},
	parser: '@typescript-eslint/parser',
	parserOptions: {
		project: path.join(__dirname, 'tsconfig.extension.json'),
	},
	plugins: [
		'@typescript-eslint',
	],
	extends: [
		'airbnb-base',
		'airbnb-typescript/base',
		'eslint:recommended',
		'plugin:@typescript-eslint/recommended',
		'plugin:import/typescript',
	],
	settings: {
		'import/resolver': {
			typescript: {
				// This is needed to properly resolve paths.
				project: path.join(__dirname, 'tsconfig.extension.json'),
			},
		},
		'import/extensions': ['.js', '.jsx', '.ts', '.tsx'],
	},
	rules: {
		semi: ['error', 'always'],
		'@typescript-eslint/lines-between-class-members': 'off',
		// max-len set to ignore "import" lines (as they usually get long and messy).
		'max-len': ['error', { code: 100, ignorePattern: '^import\\s.+\\sfrom\\s.+;' }],
		// I mainly have this off as it ruins auto import sorting in VSCode.
		'object-curly-newline': 'off',
		'import/extensions': ['error', 'ignorePackages', {
			js: 'never',
			jsx: 'never',
			ts: 'never',
			tsx: 'never',
		}],
	},

	// Overrides for types.
	overrides: [{
		files: ['**/*.d.ts'],
		rules: {
			// @typescript-eslint/no-unused-vars does not work with type definitions
			'@typescript-eslint/no-unused-vars': 'off',
			// Sometimes eslint complains about this for types (usually when using namespaces).
			'import/prefer-default-export': 'off',
			// Types are only used for development (usually!) so dev dependencies are fine.
			'import/no-extraneous-dependencies': ['error', { devDependencies: true }],
		}
	}],
};