fix(eslint-plugin): handle ternary expressions in queryFn (#7747)

Author: Eliya Cohen

packages/eslint-plugin-query/src/__tests__/exhaustive-deps.test.ts

@@ -402,6 +402,20 @@ ruleTester.run('exhaustive-deps', rule, {
         }
         `,
     },
+    {
+      name: 'queryFn as a ternary expression with dep and a skipToken',
+      code: normalizeIndent`
+        import { useQuery, skipToken } from "@tanstack/react-query";
+        const fetch = true
+        
+        function Component({ id }) {
+          useQuery({
+              queryKey: [id],
+              queryFn: fetch ? () => Promise.resolve(id) : skipToken
+          })
+        }
+      `,
+    },
   ],
   invalid: [
     {
@@ -733,5 +747,25 @@ ruleTester.run('exhaustive-deps', rule, {
         },
       ],
     },
+    {
+      name: 'should fail if queryFn is a ternary expression with missing dep and a skipToken',
+      code: normalizeIndent`
+        import { useQuery, skipToken } from "@tanstack/react-query";
+        const fetch = true
+        
+        function Component({ id }) {
+          useQuery({
+              queryKey: [],
+              queryFn: fetch ? () => Promise.resolve(id) : skipToken
+          })
+        }
+      `,
+      errors: [
+        {
+          messageId: 'missingDeps',
+          data: { deps: 'id' },
+        },
+      ],
+    },
   ],
 })

packages/eslint-plugin-query/src/rules/exhaustive-deps/exhaustive-deps.rule.ts

@@ -4,7 +4,7 @@ import { getDocsUrl } from '../../utils/get-docs-url'
 import { uniqueBy } from '../../utils/unique-by'
 import { detectTanstackQueryImports } from '../../utils/detect-react-query-imports'
 import { ExhaustiveDepsUtils } from './exhaustive-deps.utils'
-import type { TSESLint } from '@typescript-eslint/utils'
+import type { TSESLint, TSESTree } from '@typescript-eslint/utils'
 import type { ExtraRuleDocs } from '../../types'
 
 const QUERY_KEY = 'queryKey'
@@ -59,6 +59,7 @@ export const rule = createRule({
           !ASTUtils.isNodeOfOneOf(queryFn.value, [
             AST_NODE_TYPES.ArrowFunctionExpression,
             AST_NODE_TYPES.FunctionExpression,
+            AST_NODE_TYPES.ConditionalExpression,
           ])
         ) {
           return
@@ -88,15 +89,15 @@ export const rule = createRule({
         const externalRefs = ASTUtils.getExternalRefs({
           scopeManager,
           sourceCode: context.sourceCode,
-          node: queryFn.value,
+          node: getQueryFnRelevantNode(queryFn),
         })
 
         const relevantRefs = externalRefs.filter((reference) =>
           ExhaustiveDepsUtils.isRelevantReference({
             sourceCode: context.sourceCode,
             reference,
             scopeManager,
-            node: queryFn.value,
+            node: getQueryFnRelevantNode(queryFn),
           }),
         )
 
@@ -161,3 +162,18 @@ export const rule = createRule({
     }
   }),
 })
+
+function getQueryFnRelevantNode(queryFn: TSESTree.Property) {
+  if (queryFn.value.type !== AST_NODE_TYPES.ConditionalExpression) {
+    return queryFn.value
+  }
+
+  if (
+    queryFn.value.consequent.type === AST_NODE_TYPES.Identifier &&
+    queryFn.value.consequent.name === 'skipToken'
+  ) {
+    return queryFn.value.alternate
+  }
+
+  return queryFn.value.consequent
+}