feat: add hooks.has to find if a hook already exists

src/Hooks/index.ts

@@ -47,6 +47,19 @@ export class Hooks {
     return handler
   }
 
+  /**
+   * Returns a boolean whether a handler has been already registered or not
+   */
+  public has (lifecycle: 'before' | 'after', action: string, handler: HooksHandler | string): boolean {
+    const handlers = this.hooks[lifecycle].get(action)
+    const resolvedHandler = this.resolveHandler(handler)
+    if (!handlers) {
+      return false
+    }
+
+    return handlers.has(resolvedHandler)
+  }
+
   /**
    * Register hook handler for a given event and lifecycle
    */

test/hooks.spec.ts

@@ -157,6 +157,21 @@ test.group('Hooks', () => {
     await hooks.exec('before', 'save', ['foo', 'bar'])
     assert.deepEqual(stack, [])
   })
+
+  test('find if a hook already exists', async (assert) => {
+    const stack: string[] = []
+    const hooks = new Hooks()
+
+    function beforeSave (): Promise<void> {
+      return new Promise((resolve) => {
+        stack.push('one')
+        setTimeout(resolve, 100)
+      })
+    }
+
+    hooks.add('before', 'save', beforeSave)
+    assert.isTrue(hooks.has('before', 'save', beforeSave))
+  })
 })
 
 test.group('Hooks | Ioc Resolver', () => {
@@ -243,4 +258,22 @@ test.group('Hooks | Ioc Resolver', () => {
     await hooks.exec('before', 'save', ['foo', 'bar'])
     assert.deepEqual(stack, [])
   })
+
+  test('find if ioc container reference hook already exists', async (assert) => {
+    const stack: string[] = []
+
+    const ioc = new Ioc()
+    ioc.bind('User', () => {
+      return {
+        save () {
+          stack.push(String(stack.length + 1))
+        },
+      }
+    })
+
+    const hooks = new Hooks(ioc.getResolver())
+
+    hooks.add('before', 'save', 'User.save')
+    assert.isTrue(hooks.has('before', 'save', 'User.save'))
+  })
 })