feat(ts): ban const enum (#201)

packages/eslint-config-ts/index.js

@@ -159,6 +159,7 @@ module.exports = {
     'antfu/generic-spacing': 'error',
     'antfu/no-cjs-exports': 'error',
     'antfu/no-ts-export-equal': 'error',
+    'antfu/no-const-enum': 'error',
 
     // off
     '@typescript-eslint/consistent-indexed-object-style': 'off',

packages/eslint-plugin-antfu/src/index.ts

@@ -5,6 +5,7 @@ import preferInlineTypeImport from './rules/prefer-inline-type-import'
 import topLevelFunction from './rules/top-level-function'
 import noTsExportEqual from './rules/no-ts-export-equal'
 import noCjsExports from './rules/no-cjs-exports'
+import noConstEnum from './rules/no-const-enum'
 
 export default {
   rules: {
@@ -15,5 +16,6 @@ export default {
     'top-level-function': topLevelFunction,
     'no-cjs-exports': noCjsExports,
     'no-ts-export-equal': noTsExportEqual,
+    'no-const-enum': noConstEnum,
   },
 }

packages/eslint-plugin-antfu/src/rules/no-const-enum.test.ts

@@ -0,0 +1,25 @@
+import { RuleTester } from '@typescript-eslint/utils/dist/ts-eslint'
+import { it } from 'vitest'
+import rule, { RULE_NAME } from './no-const-enum'
+
+const valids = [
+  'enum E {}',
+]
+
+const invalids = [
+  'const enum E {}',
+]
+
+it('runs', () => {
+  const ruleTester: RuleTester = new RuleTester({
+    parser: require.resolve('@typescript-eslint/parser'),
+  })
+
+  ruleTester.run(RULE_NAME, rule, {
+    valid: valids,
+    invalid: invalids.map(i => ({
+      code: i,
+      errors: [{ messageId: 'noConstEnum' }],
+    })),
+  })
+})

packages/eslint-plugin-antfu/src/rules/no-const-enum.ts

@@ -0,0 +1,33 @@
+import { createEslintRule } from '../utils'
+
+export const RULE_NAME = 'no-const-enum'
+export type MessageIds = 'noConstEnum'
+export type Options = []
+
+export default createEslintRule<Options, MessageIds>({
+  name: RULE_NAME,
+  meta: {
+    type: 'problem',
+    docs: {
+      description: 'Disallow using `const enum` expression',
+      recommended: 'error',
+    },
+    schema: [],
+    messages: {
+      noConstEnum: 'Do not use `const enum` expression',
+    },
+  },
+  defaultOptions: [],
+  create: (context) => {
+    return {
+      TSEnumDeclaration: (node) => {
+        if (node.const) {
+          context.report({
+            node,
+            messageId: 'noConstEnum',
+          })
+        }
+      },
+    }
+  },
+})