feat!: esm only package (#651)

Part of vega/vega#3990

eslint.config.js

@@ -0,0 +1,82 @@
+import eslint from '@eslint/js';
+import tseslint from 'typescript-eslint';
+import tsParser from '@typescript-eslint/parser';
+import prettierConfig from 'eslint-plugin-prettier/recommended';
+import globals from 'globals';
+
+delete globals.browser['AudioWorkletGlobalScope '];
+
+/**
+ * @type {import('eslint').Linter.Config[]}
+ */
+export default [
+  {
+    ignores: ['build/**', 'coverage/**'],
+  },
+  eslint.configs.recommended,
+  ...tseslint.configs.recommendedTypeChecked,
+  {
+    languageOptions: {
+      parserOptions: {
+        project: true,
+        tsconfigRootDir: import.meta.dirname,
+      },
+    },
+  },
+  {
+    files: ['**/*.ts'],
+    languageOptions: {
+      parser: tsParser,
+      globals: {
+        ...globals.browser,
+      },
+    },
+    rules: {
+      'prettier/prettier': 'warn',
+      '@typescript-eslint/explicit-function-return-type': 'off',
+      '@typescript-eslint/no-explicit-any': 'warn',
+      '@typescript-eslint/prefer-for-of': 'error',
+      '@typescript-eslint/no-for-in-array': 'error',
+      '@typescript-eslint/no-require-imports': 'error',
+      '@typescript-eslint/no-parameter-properties': 'off',
+      '@typescript-eslint/no-unused-vars': [
+        'error',
+        {
+          vars: 'all',
+          args: 'after-used',
+          ignoreRestSiblings: true,
+        },
+      ],
+      '@typescript-eslint/no-shadow': 'error',
+      '@typescript-eslint/no-unsafe-member-access': 'warn',
+      '@typescript-eslint/no-unsafe-argument': 'warn',
+      '@typescript-eslint/no-unsafe-return': 'warn',
+      '@typescript-eslint/no-unsafe-assignment': 'warn',
+      '@typescript-eslint/no-unsafe-call': 'warn',
+      '@typescript-eslint/no-object-literal-type-assertion': 'off',
+      '@typescript-eslint/explicit-module-boundary-types': 'off',
+      '@typescript-eslint/no-namespace': 'error',
+      '@typescript-eslint/unbound-method': 'off',
+      '@typescript-eslint/no-base-to-string': 'off',
+      '@typescript-eslint/no-unnecessary-type-assertion': 'off',
+      '@typescript-eslint/restrict-template-expressions': 'off',
+      '@typescript-eslint/no-misused-promises': 'off',
+      'linebreak-style': ['error', 'unix'],
+      'no-irregular-whitespace': ['error', {skipComments: true}],
+      'no-alert': 'error',
+      'prefer-const': 'error',
+      'no-return-assign': 'error',
+      'no-useless-call': 'error',
+      'no-useless-concat': 'error',
+      'prefer-template': 'error',
+      'no-unused-vars': 'off',
+      // "no-undef": "off", // typescript takes care of this for us
+      'no-unreachable': 'off', // typescript takes care of this for us
+    },
+  },
+  prettierConfig,
+  {
+    files: ['**/*.js'],
+    ...tseslint.configs.disableTypeChecked,
+  },
+];