diff --git a/examples/molecule-codegen-dir/generated/common/basic_types.ts b/examples/molecule-codegen-dir/generated/common/basic_types.ts
index 19269563c..6ad145edc 100644
--- a/examples/molecule-codegen-dir/generated/common/basic_types.ts
+++ b/examples/molecule-codegen-dir/generated/common/basic_types.ts
@@ -3,12 +3,9 @@
 import { bytes, createBytesCodec, createFixedBytesCodec, molecule } from "@ckb-lumos/codec";
 import  { Uint32, Uint64, Uint128, DepType, HashType }  from '../../customized'
 
-const { array, vector, union, option, struct, table } = molecule;
+const { array, vector, union, option, struct, table, byteVecOf } = molecule;
 
-const fallbackBytesCodec = createBytesCodec({
-  pack: bytes.bytify,
-  unpack: bytes.hexify,
-});
+const fallbackBytesCodec = byteVecOf({ pack: bytes.bytify, unpack: bytes.hexify });
 
 function createFallbackFixedBytesCodec(byteLength: number) {
   return createFixedBytesCodec({
diff --git a/examples/molecule-codegen-dir/generated/skills.ts b/examples/molecule-codegen-dir/generated/skills.ts
index 60c92b0c7..5797ad904 100644
--- a/examples/molecule-codegen-dir/generated/skills.ts
+++ b/examples/molecule-codegen-dir/generated/skills.ts
@@ -4,12 +4,9 @@ import { bytes, createBytesCodec, createFixedBytesCodec, molecule } from "@ckb-l
 import  { Uint32, Uint64, Uint128, DepType, HashType }  from '../customized'
 import { AttrValue, SkillLevel, Uint8, Uint16 } from './common/basic_types'
 
-const { array, vector, union, option, struct, table } = molecule;
+const { array, vector, union, option, struct, table, byteVecOf } = molecule;
 
-const fallbackBytesCodec = createBytesCodec({
-  pack: bytes.bytify,
-  unpack: bytes.hexify,
-});
+const fallbackBytesCodec = byteVecOf({ pack: bytes.bytify, unpack: bytes.hexify });
 
 function createFallbackFixedBytesCodec(byteLength: number) {
   return createFixedBytesCodec({
diff --git a/examples/molecule-codegen/blockchain.ts b/examples/molecule-codegen/blockchain.ts
index cffb4fd3d..a539c8660 100644
--- a/examples/molecule-codegen/blockchain.ts
+++ b/examples/molecule-codegen/blockchain.ts
@@ -1,15 +1,11 @@
 // This file is generated by @ckb-lumos/molecule, please do not modify it manually.
 /* eslint-disable */
-
 import { bytes, createBytesCodec, createFixedBytesCodec, molecule } from "@ckb-lumos/codec";
 import { Uint32, Uint64, Uint128, DepType, HashType } from './customized'
 
-const { array, vector, union, option, struct, table } = molecule;
+const { array, vector, union, option, struct, table, byteVecOf } = molecule;
 
-const fallbackBytesCodec = createBytesCodec({
-  pack: bytes.bytify,
-  unpack: bytes.hexify,
-});
+const fallbackBytesCodec = byteVecOf({ pack: bytes.bytify, unpack: bytes.hexify });
 
 function createFallbackFixedBytesCodec(byteLength: number) {
   return createFixedBytesCodec({
@@ -140,3 +136,4 @@ export const BlockV1 = table({
   proposals: ProposalShortIdVec,
   extension: Bytes
 }, ['header', 'uncles', 'transactions', 'proposals', 'extension']);
+