Enable an optional namespace parameter for hasAction & hasFilter

packages/hooks/CHANGELOG.md

@@ -1,8 +1,14 @@
+## Master
+
+### New Feature
+
+ - Enable an optional namespace parameter for `hasAction` & `hasFilter`. When checking if an action or filter exists, `hasAction` and `hasFilter` now accept an optional paramter to limit matches by namespace.
+
 ## 2.4.0 (2019-06-12)
 
 ### New Feature
 
-- Enable support for the 'all' hook in non production environments. 
+- Enable support for the 'all' hook in non production environments.
 
 ## 2.0.4 (2019-01-03)
 

packages/hooks/README.md

@@ -39,8 +39,8 @@ In the WordPress context, API functions can be called via the global `wp.hooks`
 * `doingFilter( 'hookName' )`
 * `didAction( 'hookName' )`
 * `didFilter( 'hookName' )`
-* `hasAction( 'hookName' )`
-* `hasFilter( 'hookName' )`
+* `hasAction( 'hookName', 'namespace' )`
+* `hasFilter( 'hookName', 'namespace' )`
 * `actions`
 * `filters`
 

packages/hooks/src/createHasHook.js

@@ -5,17 +5,25 @@
  * @param  {Object}   hooks Stored hooks, keyed by hook name.
  *
  * @return {Function}       Function that returns whether any handlers are
- *                          attached to a particular hook.
+ *                          attached to a particular hook and optional namespace.
  */
 function createHasHook( hooks ) {
 	/**
-	 * Returns how many handlers are attached for the given hook.
+	 * Returns whether any handlers are attached for the given hookName and optional namespace.
 	 *
-	 * @param  {string}  hookName The name of the hook to check for.
+	 * @param {string}  hookName  The name of the hook to check for.
+	 * @param {?string} namespace Optional. The unique namespace identifying the callback
+	 *                                      in the form `vendor/plugin/function`.
 	 *
 	 * @return {boolean} Whether there are handlers that are attached to the given hook.
 	 */
-	return function hasHook( hookName ) {
+	return function hasHook( hookName, namespace ) {
+		// Use the namespace if provided.
+		if ( 'undefined' !== typeof namespace ) {
+			return hookName in hooks &&
+				hooks[ hookName ].handlers.some( ( hook ) => hook.namespace === namespace );
+		}
+
 		return hookName in hooks;
 	};
 }

packages/hooks/src/test/index.test.js

@@ -740,3 +740,38 @@ test( 'add multiple all actions and run it any hook to trigger them by priority'
 	expect( window.actionValue ).toBe( 'ba' );
 } );
 
+test( 'checking hasAction with named callbacks and removing', () => {
+	addAction( 'test.action', 'my_callback', () => {} );
+	expect( hasAction( 'test.action', 'not_my_callback' ) ).toBe( false );
+	expect( hasAction( 'test.action', 'my_callback' ) ).toBe( true );
+	removeAction( 'test.action', 'my_callback' );
+	expect( hasAction( 'test.action', 'my_callback' ) ).toBe( false );
+} );
+
+test( 'checking hasAction with named callbacks and removeAllActions', () => {
+	addAction( 'test.action', 'my_callback', () => {} );
+	addAction( 'test.action', 'my_second_callback', () => {} );
+	expect( hasAction( 'test.action', 'my_callback' ) ).toBe( true );
+	expect( hasAction( 'test.action', 'my_callback' ) ).toBe( true );
+	removeAllActions( 'test.action' );
+	expect( hasAction( 'test.action', 'my_callback' ) ).toBe( false );
+	expect( hasAction( 'test.action', 'my_callback' ) ).toBe( false );
+} );
+
+test( 'checking hasFilter with named callbacks and removing', () => {
+	addFilter( 'test.filter', 'my_callback', () => {} );
+	expect( hasFilter( 'test.filter', 'not_my_callback' ) ).toBe( false );
+	expect( hasFilter( 'test.filter', 'my_callback' ) ).toBe( true );
+	removeFilter( 'test.filter', 'my_callback' );
+	expect( hasFilter( 'test.filter', 'my_callback' ) ).toBe( false );
+} );
+
+test( 'checking hasFilter with named callbacks and removeAllActions', () => {
+	addFilter( 'test.filter', 'my_callback', () => {} );
+	addFilter( 'test.filter', 'my_second_callback', () => {} );
+	expect( hasFilter( 'test.filter', 'my_callback' ) ).toBe( true );
+	expect( hasFilter( 'test.filter', 'my_second_callback' ) ).toBe( true );
+	removeAllFilters( 'test.filter' );
+	expect( hasFilter( 'test.filter', 'my_callback' ) ).toBe( false );
+	expect( hasFilter( 'test.filter', 'my_second_callback' ) ).toBe( false );
+} );