Add defineRules function

.eslintrc.cjs

@@ -1,5 +1,5 @@
 // @ts-check
-const { defineConfig } = require('.');
+const { defineConfig, defineTypeScriptRules, defineEslintRules } = require('.');
 const { readGitignoreFiles } = require('eslint-gitignore');
 
 module.exports = defineConfig({
@@ -26,59 +26,61 @@ module.exports = defineConfig({
   },
   plugins: ['@typescript-eslint', 'prettier'],
   rules: {
-    curly: ['error'],
-    'linebreak-style': ['error', 'unix'],
-    'no-case-declarations': 'warn',
-    quotes: ['error', 'single', { avoidEscape: true }],
-    semi: ['error', 'always'],
-
-    '@typescript-eslint/array-type': [
-      'error',
-      { default: 'array-simple', readonly: 'generic' },
-    ],
-    '@typescript-eslint/ban-ts-comment': 'error',
-    '@typescript-eslint/consistent-type-imports': 'error',
-    '@typescript-eslint/explicit-module-boundary-types': 'error',
-    '@typescript-eslint/naming-convention': [
-      'error',
-      {
-        format: ['PascalCase'],
-        selector: ['class', 'interface', 'typeAlias', 'typeParameter'],
-        leadingUnderscore: 'forbid',
-        trailingUnderscore: 'forbid',
-      },
-    ],
-    '@typescript-eslint/no-inferrable-types': 'off',
-    '@typescript-eslint/no-unsafe-argument': 'error',
-    '@typescript-eslint/no-unsafe-assignment': 'off',
-    '@typescript-eslint/no-unsafe-call': 'off',
-    '@typescript-eslint/no-unsafe-member-access': 'off',
-    '@typescript-eslint/no-unsafe-return': 'error',
-    '@typescript-eslint/padding-line-between-statements': [
-      'error',
-      { blankLine: 'always', prev: 'block-like', next: '*' },
-    ],
-    '@typescript-eslint/prefer-nullish-coalescing': 'warn',
-    '@typescript-eslint/prefer-optional-chain': 'warn',
-    '@typescript-eslint/prefer-readonly': 'warn',
-    '@typescript-eslint/restrict-template-expressions': [
-      'error',
-      { allowNumber: true, allowBoolean: true },
-    ],
-    '@typescript-eslint/typedef': [
-      'warn',
-      { memberVariableDeclaration: true, variableDeclaration: true },
-    ],
+    ...defineEslintRules({
+      curly: ['error'],
+      'linebreak-style': ['error', 'unix'],
+      'no-case-declarations': 'warn',
+      quotes: ['error', 'single', { avoidEscape: true }],
+      semi: ['error', 'always'],
+    }),
+    ...defineTypeScriptRules({
+      'array-type': ['error', { default: 'array-simple', readonly: 'generic' }],
+      'ban-ts-comment': 'error',
+      'consistent-type-imports': 'error',
+      'explicit-module-boundary-types': 'error',
+      'naming-convention': [
+        'error',
+        {
+          format: ['PascalCase'],
+          selector: ['class', 'interface', 'typeAlias', 'typeParameter'],
+          leadingUnderscore: 'forbid',
+          trailingUnderscore: 'forbid',
+        },
+      ],
+      'no-inferrable-types': 'off',
+      'no-unsafe-argument': 'error',
+      'no-unsafe-assignment': 'off',
+      'no-unsafe-call': 'off',
+      'no-unsafe-member-access': 'off',
+      'no-unsafe-return': 'error',
+      'padding-line-between-statements': [
+        'error',
+        { blankLine: 'always', prev: 'block-like', next: '*' },
+      ],
+      'prefer-nullish-coalescing': 'warn',
+      'prefer-optional-chain': 'warn',
+      'prefer-readonly': 'warn',
+      'restrict-template-expressions': [
+        'error',
+        { allowNumber: true, allowBoolean: true },
+      ],
+      typedef: [
+        'warn',
+        { memberVariableDeclaration: true, variableDeclaration: true },
+      ],
+    }),
   },
   overrides: [
     {
       // Rule files are generated by `generate:rules` script
       files: ['src/rules/**/*.d.ts'],
       rules: {
-        '@typescript-eslint/array-type': 'off',
-        '@typescript-eslint/no-duplicate-type-constituents': 'off',
-        '@typescript-eslint/no-explicit-any': 'off',
-        '@typescript-eslint/no-redundant-type-constituents': 'off',
+        ...defineTypeScriptRules({
+          'array-type': 'off',
+          'no-duplicate-type-constituents': 'off',
+          'no-explicit-any': 'off',
+          'no-redundant-type-constituents': 'off',
+        }),
       },
     },
   ],

src/define-rules.ts

@@ -0,0 +1,42 @@
+import type { EslintRules } from './rules/eslint';
+import type { RuleConfig } from './rules/rule-config';
+import type { TypeScriptRules } from './rules/typescript-eslint';
+
+type RemovePrefix<
+  TPrefix extends string,
+  TString extends string,
+> = TString extends `${TPrefix}${infer T}` ? T : never;
+
+export function defineEslintRules(
+  rules: Partial<{
+    [TKey in keyof EslintRules]: EslintRules[TKey];
+  }>,
+): Partial<EslintRules> {
+  return defineRules('eslint', rules);
+}
+
+export function defineTypeScriptRules(
+  rules: Partial<{
+    [TKey in RemovePrefix<
+      '@typescript-eslint/',
+      keyof TypeScriptRules
+    >]: TypeScriptRules[`@typescript-eslint/${TKey}`];
+  }>,
+): Partial<TypeScriptRules> {
+  return defineRules('@typescript-eslint', rules);
+}
+
+function defineRules<
+  TOutput,
+  TRules extends { [x: string]: RuleConfig | undefined },
+>(pluginName: string, rules: TRules): TOutput {
+  if (pluginName === 'eslint') {
+    return rules as unknown as TOutput;
+  }
+
+  return Object.entries(rules).reduce((prev, [key, value]) => {
+    // @ts-expect-error: do it
+    prev[`${pluginName}/${key}`] = value;
+    return prev;
+  }, {} as TOutput);
+}

src/index.ts

@@ -37,6 +37,8 @@ export function defineFlatConfig(config: unknown): unknown {
   return config;
 }
 
+export { defineEslintRules, defineTypeScriptRules } from './define-rules';
+
 export type * from './config';
 export type * from './flat-config';
 export type * from './parser-options';