JS: Recognize Workflow SDK 'use workflow' and 'use step' directives

Fixes #22701

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

Author: jketema

javascript/ql/lib/change-notes/2026-09-30-workflow-sdk-directives.md

@@ -0,0 +1,4 @@
+---
+category: minorAnalysis
+---
+* The Workflow SDK directives `"use workflow"` and `"use step"` are now recognized as known directives, so the `js/unknown-directive` query no longer flags them.

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

@@ -490,6 +490,32 @@ module Directive {
   class WorkletDirective extends KnownDirective {
     WorkletDirective() { this.getDirectiveText() = "worklet" }
   }
+
+  /**
+   * A Workflow SDK `use workflow` directive.
+   *
+   * Example:
+   *
+   * ```
+   * "use workflow";
+   * ```
+   */
+  class UseWorkflowDirective extends KnownDirective {
+    UseWorkflowDirective() { this.getDirectiveText() = "use workflow" }
+  }
+
+  /**
+   * A Workflow SDK `use step` directive.
+   *
+   * Example:
+   *
+   * ```
+   * "use step";
+   * ```
+   */
+  class UseStepDirective extends KnownDirective {
+    UseStepDirective() { this.getDirectiveText() = "use step" }
+  }
 }
 
 /**

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

@@ -19,4 +19,6 @@
 | tst.js:27:3:27:14 | 'use cache'; | use cache |
 | tst.js:28:3:28:22 | 'use cache: remote'; | use cache: remote |
 | tst.js:29:3:29:23 | 'use ca ... ivate'; | use cache: private |
-| tst.js:36:5:36:17 | 'use strict'; | use strict |
+| tst.js:30:3:30:17 | 'use workflow'; | use workflow |
+| tst.js:31:3:31:13 | 'use step'; | use step |
+| tst.js:38:5:38:17 | 'use strict'; | use strict |

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

@@ -27,6 +27,8 @@ function f() {
   'use cache';
   'use cache: remote';
   'use cache: private';
+  'use workflow';
+  'use step';
   ;
   'use strict'; // but this isn't a directive
 }

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:43:5:43:17 | "[0, 0, 0];"; | Unknown directive: '[0, 0, 0];'. |
-| UnknownDirective.js:44:5:44:65 | "[0, 0, ... , 0];"; | Unknown directive: '[0, 0, 0, 0, 0, 0, 0 ... (truncated)'. |
-| UnknownDirective.js:50:5:50:15 | ":nomunge"; | Unknown directive: ':nomunge'. |
-| UnknownDirective.js:51:5:51:30 | "foo(), ... munge"; | Unknown directive: 'foo(), bar, baz:nomu ... (truncated)'. |
+| UnknownDirective.js:45:5:45:17 | "[0, 0, 0];"; | Unknown directive: '[0, 0, 0];'. |
+| UnknownDirective.js:46:5:46:65 | "[0, 0, ... , 0];"; | Unknown directive: '[0, 0, 0, 0, 0, 0, 0 ... (truncated)'. |
+| UnknownDirective.js:52:5:52:15 | ":nomunge"; | Unknown directive: ':nomunge'. |
+| UnknownDirective.js:53:5:53:30 | "foo(), ... munge"; | Unknown directive: 'foo(), bar, baz:nomu ... (truncated)'. |

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

@@ -37,6 +37,8 @@ function good() {
     "use cache";
     "use cache: remote";
     "use cache: private";
+    "use workflow";
+    "use step";
 }
 
 function data() {