Update to esm, update deepslate (#244)

.eslintrc.cjs

@@ -0,0 +1,73 @@
+module.exports = {
+	env: {
+		es6: true,
+		node: true,
+	},
+	parser: '@typescript-eslint/parser',
+	parserOptions: {
+		tsconfigRootDir: __dirname,
+		project: './tsconfig-eslint.json',
+	},
+	plugins: [
+		'@typescript-eslint',
+	],
+	ignorePatterns: [
+		'**/node_modules',
+		'**/dist',
+	],
+	rules: {
+		'@typescript-eslint/consistent-type-imports': [
+			'warn',
+			{
+				prefer: 'type-imports',
+			},
+		],
+		'@typescript-eslint/prefer-readonly': 'warn',
+		'@typescript-eslint/quotes': [
+			'warn',
+			'single',
+			{
+				avoidEscape: true,
+			},
+		],
+		'@typescript-eslint/semi': [
+			'warn',
+			'never',
+		],
+		'@typescript-eslint/indent': [
+			'warn',
+			'tab',
+		],
+		'@typescript-eslint/member-delimiter-style': [
+			'warn',
+			{
+				multiline: {
+					delimiter: 'comma',
+					requireLast: true,
+				},
+				singleline: {
+					delimiter: 'comma',
+					requireLast: false,
+				},
+				overrides: {
+					interface: {
+						multiline: {
+							delimiter: undefined,
+						},
+					},
+				},
+			},
+		],
+		'comma-dangle': 'off',
+		'@typescript-eslint/comma-dangle': ['warn', 'always-multiline'],
+		indent: 'off',
+		'eol-last': 'warn',
+		'no-fallthrough': 'warn',
+		'prefer-const': 'warn',
+		'prefer-object-spread': 'warn',
+		'quote-props': [
+			'warn',
+			'as-needed',
+		],
+	},
+}