chore: add no-case-declarations rule

Author: Christopher Quadflieg

src/rules/eslint/index.d.ts

@@ -1,11 +1,18 @@
 import type { CommaDangleRule } from './comma-dangle';
 import type { CurlyRule } from './curly';
 import type { LinebreakStyleRule } from './linebreak-style';
+import type { NoCaseDeclarationsRule } from './no-case-declarations';
 import type { NoDebuggerRule } from './no-debugger';
 import type { QuotesRule } from './quotes';
 import type { SemiRule } from './semi';
 
 /**
  * All eslint rules.
  */
-export type EslintRules = CommaDangleRule & CurlyRule & LinebreakStyleRule & NoDebuggerRule & QuotesRule & SemiRule;
+export type EslintRules = CommaDangleRule &
+  CurlyRule &
+  LinebreakStyleRule &
+  NoCaseDeclarationsRule &
+  NoDebuggerRule &
+  QuotesRule &
+  SemiRule;

src/rules/eslint/no-case-declarations.d.ts

@@ -0,0 +1,22 @@
+import type { RuleConfig } from '../rule-config';
+
+/**
+ * Disallow lexical declarations in case/default clauses.
+ *
+ * @see [no-case-declarations](https://eslint.org/docs/rules/no-case-declarations)
+ */
+export type NoCaseDeclarationsRuleConfig = RuleConfig;
+
+/**
+ * Disallow lexical declarations in case/default clauses.
+ *
+ * @see [no-case-declarations](https://eslint.org/docs/rules/no-case-declarations)
+ */
+export interface NoCaseDeclarationsRule {
+  /**
+   * Disallow lexical declarations in case/default clauses.
+   *
+   * @see [no-case-declarations](https://eslint.org/docs/rules/no-case-declarations)
+   */
+  'no-case-declarations': NoCaseDeclarationsRuleConfig;
+}