deriveBits: directly use goja.NewPromise

webcrypto/subtle_crypto.go

@@ -606,7 +606,6 @@ func (sc *SubtleCrypto) DeriveKey(
 //
 // The `length` parameter is the number of bits to derive. The number should be a multiple of 8.
 func (sc *SubtleCrypto) DeriveBits(algorithm goja.Value, baseKey goja.Value, length int) *goja.Promise {
-	promise, resolve, reject := promises.New(sc.vu)
 	rt := sc.vu.Runtime()
 
 	var publicKey, privateKey CryptoKey
@@ -636,12 +635,15 @@ func (sc *SubtleCrypto) DeriveBits(algorithm goja.Value, baseKey goja.Value, len
 
 		return nil
 	}()
+
+	promise, resolve, reject := rt.NewPromise()
+	callback := sc.vu.RegisterCallback()
 	if err != nil {
 		reject(err)
 		return promise
 	}
 
-	go func() {
+	callback(func() error {
 		result, err := func() ([]byte, error) {
 			deriver, err := newBitsDeriver(algName)
 			if err != nil {
@@ -661,11 +663,12 @@ func (sc *SubtleCrypto) DeriveBits(algorithm goja.Value, baseKey goja.Value, len
 		}()
 		if err != nil {
 			reject(err)
-			return
+			return nil
 		}
 
 		resolve(rt.NewArrayBuffer(result))
-	}()
+		return nil
+	})
 
 	return promise
 }