JS: Add UseServer and UseClient directives

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

@@ -406,6 +406,32 @@ module Directive {
   class BundleDirective extends KnownDirective {
     BundleDirective() { this.getDirectiveText() = "bundle" }
   }
+
+  /**
+   * A `use server` directive.
+   *
+   * Example:
+   *
+   * ```
+   * "use server";
+   * ```
+   */
+  class UseServerDirective extends KnownDirective {
+    UseServerDirective() { this.getDirectiveText() = "use server" }
+  }
+
+  /**
+   * A `use client` directive.
+   *
+   * Example:
+   *
+   * ```
+   * "use client";
+   * ```
+   */
+  class UseClientDirective extends KnownDirective {
+    UseClientDirective() { this.getDirectiveText() = "use client" }
+  }
 }
 
 /** DEPRECATED. Use `Directive::KnownDirective` instead. */

javascript/ql/test/query-tests/Expressions/UnknownDirective/UnknownDirective.expected

@@ -11,7 +11,7 @@
 | UnknownDirective.js:12:5:12:17 | "use struct;" | Unknown directive: 'use struct;'. |
 | UnknownDirective.js:13:5:13:17 | "Use Strict"; | Unknown directive: 'Use Strict'. |
 | UnknownDirective.js:14:5:14:14 | "use bar"; | Unknown directive: 'use bar'. |
-| UnknownDirective.js:38:5:38:17 | "[0, 0, 0];"; | Unknown directive: '[0, 0, 0];'. |
+| UnknownDirective.js:40:5:40:17 | "[0, 0, 0];"; | Unknown directive: '[0, 0, 0];'. |
-| UnknownDirective.js:39:5:39:65 | "[0, 0, ... , 0];"; | Unknown directive: '[0, 0, 0, 0, 0, 0, 0 ... (truncated)'. |
+| UnknownDirective.js:41:5:41:65 | "[0, 0, ... , 0];"; | Unknown directive: '[0, 0, 0, 0, 0, 0, 0 ... (truncated)'. |
-| UnknownDirective.js:45:5:45:15 | ":nomunge"; | Unknown directive: ':nomunge'. |
+| UnknownDirective.js:47:5:47:15 | ":nomunge"; | Unknown directive: ':nomunge'. |
-| UnknownDirective.js:46:5:46:30 | "foo(), ... munge"; | Unknown directive: 'foo(), bar, baz:nomu ... (truncated)'. |
+| UnknownDirective.js:48:5:48:30 | "foo(), ... munge"; | Unknown directive: 'foo(), bar, baz:nomu ... (truncated)'. |

javascript/ql/test/query-tests/Expressions/UnknownDirective/UnknownDirective.js

@@ -32,6 +32,8 @@ function good() {
     "ngNoInject"; // OK
     "deps foo"; // OK
     "deps bar"; // OK
+    "use server"; // OK
+    "use client"; // OK
 }
 
 function data() {