Add UseMemoDirective and UseNoMemoDirective classes

javascript/ql/lib/change-notes/2026-05-05-use-memo-directive.md

@@ -0,0 +1,4 @@
+---
+category: feature
+---
+* Added `UseMemoDirective` and `UseNoMemoDirective` classes to model the React compiler directives `"use memo"` and `"use no memo"`.

javascript/ql/lib/semmle/javascript/Stmt.qll

@@ -435,6 +435,32 @@ module Directive {
     UseClientDirective() { this.getDirectiveText() = "use client" }
   }
 
+  /**
+   * A `use memo` directive.
+   *
+   * Example:
+   *
+   * ```
+   * "use memo";
+   * ```
+   */
+  class UseMemoDirective extends KnownDirective {
+    UseMemoDirective() { this.getDirectiveText() = "use memo" }
+  }
+
+  /**
+   * A `use no memo` directive.
+   *
+   * Example:
+   *
+   * ```
+   * "use no memo";
+   * ```
+   */
+  class UseNoMemoDirective extends KnownDirective {
+    UseNoMemoDirective() { this.getDirectiveText() = "use no memo" }
+  }
+
   /**
    * A `use cache` directive.
    *

javascript/ql/test/library-tests/Directives/KnownDirective.expected

@@ -3,14 +3,18 @@
 | tst.js:3:1:3:9 | 'bundle'; | bundle |
 | tst.js:4:1:4:13 | 'use server'; | use server |
 | tst.js:5:1:5:13 | 'use client'; | use client |
-| tst.js:6:1:6:12 | 'use cache'; | use cache |
-| tst.js:7:1:7:20 | 'use cache: remote'; | use cache: remote |
-| tst.js:8:1:8:21 | 'use ca ... ivate'; | use cache: private |
-| tst.js:17:3:17:12 | 'use asm'; | use asm |
-| tst.js:18:3:18:11 | 'bundle'; | bundle |
-| tst.js:19:3:19:15 | 'use server'; | use server |
-| tst.js:20:3:20:15 | 'use client'; | use client |
-| tst.js:21:3:21:14 | 'use cache'; | use cache |
-| tst.js:22:3:22:22 | 'use cache: remote'; | use cache: remote |
-| tst.js:23:3:23:23 | 'use ca ... ivate'; | use cache: private |
-| tst.js:30:5:30:17 | 'use strict'; | use strict |
+| tst.js:6:1:6:11 | 'use memo'; | use memo |
+| tst.js:7:1:7:14 | 'use no memo'; | use no memo |
+| tst.js:8:1:8:12 | 'use cache'; | use cache |
+| tst.js:9:1:9:20 | 'use cache: remote'; | use cache: remote |
+| tst.js:10:1:10:21 | 'use ca ... ivate'; | use cache: private |
+| tst.js:19:3:19:12 | 'use asm'; | use asm |
+| tst.js:20:3:20:11 | 'bundle'; | bundle |
+| tst.js:21:3:21:15 | 'use server'; | use server |
+| tst.js:22:3:22:15 | 'use client'; | use client |
+| tst.js:23:3:23:13 | 'use memo'; | use memo |
+| tst.js:24:3:24:16 | 'use no memo'; | use no memo |
+| tst.js:25:3:25:14 | 'use cache'; | use cache |
+| tst.js:26:3:26:22 | 'use cache: remote'; | use cache: remote |
+| tst.js:27:3:27:23 | 'use ca ... ivate'; | use cache: private |
+| tst.js:34:5:34:17 | 'use strict'; | use strict |

javascript/ql/test/library-tests/Directives/tst.js

@@ -3,6 +3,8 @@
 'bundle';// and this
 'use server';
 'use client';
+'use memo';
+'use no memo';
 'use cache';
 'use cache: remote';
 'use cache: private';
@@ -18,6 +20,8 @@ function f() {
   'bundle';
   'use server';
   'use client';
+  'use memo';
+  'use no memo';
   'use cache';
   'use cache: remote';
   'use cache: private';