typescript-eslint · JoshuaKGoldberg · Apr 14, 2025 · Apr 5, 2025 · Apr 7, 2025 · Apr 8, 2025
diff --git a/packages/eslint-plugin/src/rules/no-explicit-any.ts b/packages/eslint-plugin/src/rules/no-explicit-any.ts
@@ -10,7 +10,11 @@ export type Options = [
     ignoreRestArgs?: boolean;
   },
 ];
-export type MessageIds = 'suggestNever' | 'suggestUnknown' | 'unexpectedAny';
+export type MessageIds =
+  | 'suggestNever'
+  | 'suggestPropertyKey'
+  | 'suggestUnknown'
+  | 'unexpectedAny';
 
 export default createRule<Options, MessageIds>({
   name: 'no-explicit-any',
@@ -25,6 +29,8 @@ export default createRule<Options, MessageIds>({
     messages: {
       suggestNever:
         "Use `never` instead, this is useful when instantiating generic type parameters that you don't need to know the type of.",
+      suggestPropertyKey:
+        'Use `PropertyKey` instead, this is more explicit than `keyof any`.',
       suggestUnknown:
         'Use `unknown` instead, this will force you to explicitly, and safely assert the type is correct.',
       unexpectedAny: 'Unexpected any. Specify a different type.',
@@ -170,8 +176,35 @@ export default createRule<Options, MessageIds>({
       );
     }
 
+    /**
+     * Checks if the node is within a keyof any expression
+     * @param node the node to be validated.
+     * @returns true if the node is within a keyof any expression, false otherwise
+     * @private
+     */
+    function isNodeWithinKeyofAny(node: TSESTree.TSAnyKeyword): boolean {
+      return (
+        node.parent.type === AST_NODE_TYPES.TSTypeOperator &&
+        node.parent.operator === 'keyof'
+      );
+    }
+
+    /**
+     * Creates a fixer that replaces a keyof any with PropertyKey
+     * @param node the node to be fixed.
+     * @returns a function that will fix the node.
+     * @private
+     */
+    function createPropertyKeyFixer(node: TSESTree.TSAnyKeyword) {
+      return (fixer: TSESLint.RuleFixer) => {
+        return fixer.replaceText(node.parent, 'PropertyKey');
+      };
+    }
+
     return {
       TSAnyKeyword(node): void {
+        const isKeyofAny = isNodeWithinKeyofAny(node);
+
         if (ignoreRestArgs && isNodeDescendantOfRestElementInFunction(node)) {
           return;
         }
@@ -181,25 +214,29 @@ export default createRule<Options, MessageIds>({
           suggest: TSESLint.ReportSuggestionArray<MessageIds> | null;
         } = {
           fix: null,
-          suggest: [
-            {
-              messageId: 'suggestUnknown',
-              fix(fixer): TSESLint.RuleFix {
-                return fixer.replaceText(node, 'unknown');
-              },
-            },
-            {
-              messageId: 'suggestNever',
-              fix(fixer): TSESLint.RuleFix {
-                return fixer.replaceText(node, 'never');
-              },
-            },
-          ],
+          suggest: isKeyofAny
+            ? [
+                {
+                  messageId: 'suggestPropertyKey',
+                  fix: createPropertyKeyFixer(node),
+                },
+              ]
+            : [
+                {
+                  messageId: 'suggestUnknown',
+                  fix: fixer => fixer.replaceText(node, 'unknown'),
+                },
+                {
+                  messageId: 'suggestNever',
+                  fix: fixer => fixer.replaceText(node, 'never'),
+                },
+              ],
         };
 
         if (fixToUnknown) {
-          fixOrSuggest.fix = (fixer): TSESLint.RuleFix =>
-            fixer.replaceText(node, 'unknown');
+          fixOrSuggest.fix = isKeyofAny
+            ? createPropertyKeyFixer(node)
+            : fixer => fixer.replaceText(node, 'unknown');
         }
 
         context.report({