Compress public bytecode

yarn-project/circuits.js/package.json

@@ -46,6 +46,7 @@
     "@aztec/types": "workspace:^",
     "eslint": "^8.35.0",
     "lodash.chunk": "^4.2.0",
+    "pako": "^2.1.0",
     "tslib": "^2.4.0"
   },
   "devDependencies": {

yarn-project/circuits.js/src/contract/public_bytecode.ts

@@ -7,15 +7,24 @@ import {
 } from '@aztec/foundation/serialize';
 import { ContractClass } from '@aztec/types/contracts';
 
+import { deflate, inflate } from 'pako';
+
 import { FUNCTION_SELECTOR_NUM_BYTES } from '../constants.gen.js';
 
 /**
  * Packs together a set of public functions for a contract class.
  * @remarks This function should no longer be necessary once we have a single bytecode per contract.
  */
 export function packBytecode(publicFns: ContractClass['publicFunctions']): Buffer {
-  return serializeBufferArrayToVector(
-    publicFns.map(fn => serializeToBuffer(fn.selector, fn.isInternal, numToInt32BE(fn.bytecode.length), fn.bytecode)),
+  return Buffer.from(
+    deflate(
+      serializeBufferArrayToVector(
+        publicFns.map(fn =>
+          serializeToBuffer(fn.selector, fn.isInternal, numToInt32BE(fn.bytecode.length), fn.bytecode),
+        ),
+      ),
+      { raw: true, level: 9 },
+    ),
   );
 }
 
@@ -24,7 +33,7 @@ export function packBytecode(publicFns: ContractClass['publicFunctions']): Buffe
  * @remarks This function should no longer be necessary once we have a single bytecode per contract.
  */
 export function unpackBytecode(buffer: Buffer): ContractClass['publicFunctions'] {
-  const reader = BufferReader.asReader(buffer);
+  const reader = BufferReader.asReader(inflate(buffer, { raw: true }));
   return reader.readVector({
     fromBuffer: (reader: BufferReader) => ({
       selector: FunctionSelector.fromBuffer(reader.readBytes(FUNCTION_SELECTOR_NUM_BYTES)),

yarn-project/yarn.lock

@@ -313,6 +313,7 @@ __metadata:
     eslint: ^8.35.0
     jest: ^29.5.0
     lodash.chunk: ^4.2.0
+    pako: ^2.1.0
     prettier: ^2.8.4
     ts-jest: ^29.1.0
     ts-node: ^10.9.1