diff --git a/.github/workflows/reusable/cached-build/action.yml b/.github/workflows/reusable/cached-build/action.yml
index 3199597c6e..8d4efc9e2e 100644
--- a/.github/workflows/reusable/cached-build/action.yml
+++ b/.github/workflows/reusable/cached-build/action.yml
@@ -29,6 +29,7 @@ runs:
           packages/sdk/src/generated
           packages/autocertifier-client/generated
           packages/proto-rpc/generated
+          packages/proto-rpc/test/proto
           packages/dht/generated
           packages/trackerless-network/generated
     - name: ci
diff --git a/packages/autocertifier-client/tsconfig.json b/packages/autocertifier-client/tsconfig.json
index 8a784bac80..2f229666e8 100644
--- a/packages/autocertifier-client/tsconfig.json
+++ b/packages/autocertifier-client/tsconfig.json
@@ -1,8 +1,7 @@
 {
   "extends": "../../tsconfig.node.json",
   "compilerOptions": {
-    "outDir": "dist",
-    "noImplicitOverride": false
+    "outDir": "dist"
   },
   "include": [
     "src",
diff --git a/packages/dht/test/unit/PeerManager.test.ts b/packages/dht/test/unit/PeerManager.test.ts
index 43f28b3601..ba744d6445 100644
--- a/packages/dht/test/unit/PeerManager.test.ts
+++ b/packages/dht/test/unit/PeerManager.test.ts
@@ -17,7 +17,7 @@ const createDhtNodeRpcRemote = (
 ) => {
     const remote = new class extends DhtNodeRpcRemote {
         // eslint-disable-next-line class-methods-use-this
-        async ping(): Promise<boolean> {
+        override async ping(): Promise<boolean> {
             return !pingFailures.has(toNodeId(peerDescriptor))
         }
     }(localPeerDescriptor, peerDescriptor, undefined as any, new MockRpcCommunicator())
diff --git a/packages/dht/test/utils/utils.ts b/packages/dht/test/utils/utils.ts
index 1cc9db2fbc..fcd6c005aa 100644
--- a/packages/dht/test/utils/utils.ts
+++ b/packages/dht/test/utils/utils.ts
@@ -62,7 +62,7 @@ export const createMockRingNode = async (
         rpcRequestTimeout: 5000
     }
     const node = new class extends DhtNode {
-        async stop(): Promise<void> {
+        override async stop(): Promise<void> {
             await super.stop()
             await mockConnectionManager.stop()
         }
@@ -90,7 +90,7 @@ export const createMockConnectionDhtNode = async (
         rpcRequestTimeout: 5000
     }
     const node = new class extends DhtNode {
-        async stop(): Promise<void> {
+        override async stop(): Promise<void> {
             await super.stop()
             await mockConnectionManager.stop()
         }
diff --git a/packages/dht/tsconfig.jest.json b/packages/dht/tsconfig.jest.json
index a227c3edba..ebf2ebceba 100644
--- a/packages/dht/tsconfig.jest.json
+++ b/packages/dht/tsconfig.jest.json
@@ -1,16 +1,13 @@
 {
   "extends": "../../tsconfig.jest.json",
-  "compilerOptions": {
-    "noImplicitOverride": false
-  },
   "include": [
     "src",
-    "generated",
     "test",
     "package.json",
     "scripts"
   ],
   "references": [
+    { "path": "./tsconfig.proto.json" },
     { "path": "../utils/tsconfig.node.json" },
     { "path": "../test-utils/tsconfig.node.json" },
     { "path": "../proto-rpc/tsconfig.node.json" },
diff --git a/packages/dht/tsconfig.karma.json b/packages/dht/tsconfig.karma.json
index e1d0a37cc0..fa8692c9e0 100644
--- a/packages/dht/tsconfig.karma.json
+++ b/packages/dht/tsconfig.karma.json
@@ -2,10 +2,7 @@
   "extends": "../../tsconfig.karma.json",
   "compilerOptions": {
     "outDir": "dist",
-    "types": [
-      "jest",
-      "jest-extended"
-    ]
+    "types": ["jest", "jest-extended"]
   },
   "include": [
     "src",
diff --git a/packages/dht/tsconfig.node.json b/packages/dht/tsconfig.node.json
index 9adaea3779..4a73ff0585 100644
--- a/packages/dht/tsconfig.node.json
+++ b/packages/dht/tsconfig.node.json
@@ -1,15 +1,14 @@
 {
   "extends": "../../tsconfig.node.json",
   "compilerOptions": {
-    "outDir": "dist",
-    "noImplicitOverride": false
+    "outDir": "dist"
   },
   "include": [
     "src",
-    "generated",
     "package.json"
   ],
   "references": [
+    { "path": "./tsconfig.proto.json" },
     { "path": "../utils/tsconfig.node.json" },
     { "path": "../test-utils/tsconfig.node.json" },
     { "path": "../proto-rpc/tsconfig.node.json" },
diff --git a/packages/dht/tsconfig.proto.json b/packages/dht/tsconfig.proto.json
new file mode 100644
index 0000000000..16cd49bd0e
--- /dev/null
+++ b/packages/dht/tsconfig.proto.json
@@ -0,0 +1,9 @@
+{
+  "extends": "../../tsconfig.proto.json",
+  "compilerOptions": {
+    "outDir": "dist"
+  },
+  "include": [
+    "generated"
+  ]
+}
diff --git a/packages/proto-rpc/package.json b/packages/proto-rpc/package.json
index 59ff0f64a3..b053a17ece 100644
--- a/packages/proto-rpc/package.json
+++ b/packages/proto-rpc/package.json
@@ -18,8 +18,8 @@
   "license": "(Apache-2.0 AND BSD-3-Clause)",
   "author": "Streamr Network AG <contact@streamr.network>",
   "scripts": {
-    "prebuild": "./proto.sh",
-    "build": "tsc -b tsconfig.node.json",
+    "prebuild": "./proto.sh && ./test-proto.sh",
+    "build": "tsc -b tsconfig.node.json && tsc -b tsconfig.test-proto.json",
     "build-browser": "webpack --mode=development --progress",
     "check": "./test-proto.sh && tsc -p ./tsconfig.jest.json",
     "clean": "jest --clearCache || true; rm -rf dist *.tsbuildinfo node_modules/.cache || true",
diff --git a/packages/proto-rpc/test-proto.sh b/packages/proto-rpc/test-proto.sh
index 5c602334dd..bd35e64dcb 100755
--- a/packages/proto-rpc/test-proto.sh
+++ b/packages/proto-rpc/test-proto.sh
@@ -1,2 +1,9 @@
-mkdir -p ./test/proto
-npx protoc --ts_out ./test/proto --ts_opt server_generic,generate_dependencies --proto_path test/protos test/protos/*.proto --experimental_allow_proto3_optional
+# Run protoc only when test/protos exists (it's absent in Docker builds)
+if [ -d ./test/protos ]; then
+  mkdir -p ./test/proto
+  npx protoc \
+    --ts_out ./test/proto \
+    --ts_opt server_generic,generate_dependencies \
+    --proto_path test/protos test/protos/*.proto \
+    --experimental_allow_proto3_optional
+fi
diff --git a/packages/proto-rpc/tsconfig.jest.json b/packages/proto-rpc/tsconfig.jest.json
index c1b2113112..de17e3cec8 100644
--- a/packages/proto-rpc/tsconfig.jest.json
+++ b/packages/proto-rpc/tsconfig.jest.json
@@ -1,14 +1,15 @@
 {
   "extends": "../../tsconfig.jest.json",
-  "compilerOptions": {
-    "noImplicitOverride": false
-  },
   "include": [
     "src",
-    "generated",
     "test"
   ],
+  "exclude": [
+    "test/proto"
+  ],
   "references": [
+    { "path": "./tsconfig.proto.json" },
+    { "path": "./tsconfig.test-proto.json" },
     { "path": "../utils/tsconfig.node.json" },
     { "path": "../test-utils/tsconfig.node.json" }
   ]
diff --git a/packages/proto-rpc/tsconfig.karma.json b/packages/proto-rpc/tsconfig.karma.json
index f8f93ce799..fec2d7ecdd 100644
--- a/packages/proto-rpc/tsconfig.karma.json
+++ b/packages/proto-rpc/tsconfig.karma.json
@@ -2,9 +2,7 @@
   "extends": "../../tsconfig.karma.json",
   "compilerOptions": {
     "outDir": "dist",
-    "types": [
-      "jest"
-    ]
+    "types": ["jest"]
   },
   "include": [
     "src"
diff --git a/packages/proto-rpc/tsconfig.node.json b/packages/proto-rpc/tsconfig.node.json
index 8a784bac80..af1d2f7868 100644
--- a/packages/proto-rpc/tsconfig.node.json
+++ b/packages/proto-rpc/tsconfig.node.json
@@ -1,14 +1,13 @@
 {
   "extends": "../../tsconfig.node.json",
   "compilerOptions": {
-    "outDir": "dist",
-    "noImplicitOverride": false
+    "outDir": "dist"
   },
   "include": [
-    "src",
-    "generated"
+    "src"
   ],
   "references": [
+    { "path": "./tsconfig.proto.json" },
     { "path": "../utils/tsconfig.node.json" }
   ]
 }
diff --git a/packages/proto-rpc/tsconfig.proto.json b/packages/proto-rpc/tsconfig.proto.json
new file mode 100644
index 0000000000..16cd49bd0e
--- /dev/null
+++ b/packages/proto-rpc/tsconfig.proto.json
@@ -0,0 +1,9 @@
+{
+  "extends": "../../tsconfig.proto.json",
+  "compilerOptions": {
+    "outDir": "dist"
+  },
+  "include": [
+    "generated"
+  ]
+}
diff --git a/packages/proto-rpc/tsconfig.test-proto.json b/packages/proto-rpc/tsconfig.test-proto.json
new file mode 100644
index 0000000000..fe7cc69acf
--- /dev/null
+++ b/packages/proto-rpc/tsconfig.test-proto.json
@@ -0,0 +1,9 @@
+{
+  "extends": "../../tsconfig.proto.json",
+  "compilerOptions": {
+    "emitDeclarationOnly": true
+  },
+  "include": [
+    "test/proto"
+  ]
+}
diff --git a/packages/sdk/src/identity/EthereumKeyPairIdentity.ts b/packages/sdk/src/identity/EthereumKeyPairIdentity.ts
index 0a03c97208..e928eaea41 100644
--- a/packages/sdk/src/identity/EthereumKeyPairIdentity.ts
+++ b/packages/sdk/src/identity/EthereumKeyPairIdentity.ts
@@ -26,7 +26,7 @@ export class EthereumKeyPairIdentity extends KeyPairIdentity {
         return signingUtil.createSignature(payload, this.privateKey)
     }
 
-    async getTransactionSigner(rpcProviderSource: RpcProviderSource): Promise<SignerWithProvider> {
+    override async getTransactionSigner(rpcProviderSource: RpcProviderSource): Promise<SignerWithProvider> {
         const primaryProvider = rpcProviderSource.getProvider()
         return new Wallet(binaryToHex(this.privateKey), primaryProvider) as SignerWithProvider
     }
diff --git a/packages/sdk/tsconfig.jest.json b/packages/sdk/tsconfig.jest.json
index 59c7631e2f..9721f94084 100644
--- a/packages/sdk/tsconfig.jest.json
+++ b/packages/sdk/tsconfig.jest.json
@@ -3,8 +3,7 @@
   "compilerOptions": {
     "lib": ["es2021", "dom"],
     "experimentalDecorators": true,
-    "emitDecoratorMetadata": true,
-    "noImplicitOverride": false
+    "emitDecoratorMetadata": true
   },
   "include": [
     "package.json",
@@ -16,10 +15,13 @@
     "scripts"
   ],
   "exclude": [
+    "src/generated/google",
+    "src/generated/packages",
     "test/exports",
     "src/exports-esm.mjs"
   ],
   "references": [
+    { "path": "./tsconfig.proto.json" },
     { "path": "../test-utils/tsconfig.node.json" },
     { "path": "../dht/tsconfig.node.json" },
     { "path": "../trackerless-network/tsconfig.node.json" }
diff --git a/packages/sdk/tsconfig.node.json b/packages/sdk/tsconfig.node.json
index 0e9591b2cf..dcecc65dd2 100644
--- a/packages/sdk/tsconfig.node.json
+++ b/packages/sdk/tsconfig.node.json
@@ -5,17 +5,19 @@
     "declarationDir": "dist/types",
     "lib": ["es2021", "dom"],
     "experimentalDecorators": true,
-    "emitDecoratorMetadata": true,
-    "noImplicitOverride": false
+    "emitDecoratorMetadata": true
   },
   "include": [
     "src",
     "src/**/*.json"
   ],
   "exclude": [
+    "src/generated/google",
+    "src/generated/packages",
     "src/exports-esm.mjs"
   ],
   "references": [
+    { "path": "./tsconfig.proto.json" },
     { "path": "../test-utils/tsconfig.node.json" },
     { "path": "../trackerless-network/tsconfig.node.json" },
     { "path": "../dht/tsconfig.node.json" }
diff --git a/packages/sdk/tsconfig.proto.json b/packages/sdk/tsconfig.proto.json
new file mode 100644
index 0000000000..fca4cec775
--- /dev/null
+++ b/packages/sdk/tsconfig.proto.json
@@ -0,0 +1,11 @@
+{
+  "extends": "../../tsconfig.proto.json",
+  "compilerOptions": {
+    "outDir": "dist",
+    "declarationDir": "dist/types"
+  },
+  "include": [
+    "src/generated/google",
+    "src/generated/packages"
+  ]
+}
diff --git a/packages/trackerless-network/tsconfig.jest.json b/packages/trackerless-network/tsconfig.jest.json
index 15c903741d..51bb34badd 100644
--- a/packages/trackerless-network/tsconfig.jest.json
+++ b/packages/trackerless-network/tsconfig.jest.json
@@ -5,16 +5,15 @@
       "node",
       "jest",
       "@streamr/test-utils/customMatcherTypes"
-    ],
-    "noImplicitOverride": false
+    ]
   },
   "include": [
     "src",
-    "generated",
     "test",
     "package.json"
   ],
   "references": [
+    { "path": "./tsconfig.proto.json" },
     { "path": "../proto-rpc/tsconfig.node.json" },
     { "path": "../dht/tsconfig.node.json" }
   ]
diff --git a/packages/trackerless-network/tsconfig.karma.json b/packages/trackerless-network/tsconfig.karma.json
index 7e3aa6a7b8..e5c956bfcb 100644
--- a/packages/trackerless-network/tsconfig.karma.json
+++ b/packages/trackerless-network/tsconfig.karma.json
@@ -8,7 +8,6 @@
     ]
   },
   "include": [
-    "src",
-    "generated"
+    "src"
   ]
 }
diff --git a/packages/trackerless-network/tsconfig.node.json b/packages/trackerless-network/tsconfig.node.json
index 91ca0871c5..698bbf2c55 100644
--- a/packages/trackerless-network/tsconfig.node.json
+++ b/packages/trackerless-network/tsconfig.node.json
@@ -1,17 +1,16 @@
 {
   "extends": "../../tsconfig.node.json",
   "compilerOptions": {
-    "outDir": "dist",
-    "noImplicitOverride": false
+    "outDir": "dist"
   },
   "include": [
     "src",
-    "generated",
     "test/benchmark/first-message.ts",
     "test/utils/utils.ts",
     "package.json"
   ],
   "references": [
+    { "path": "./tsconfig.proto.json" },
     { "path": "../dht/tsconfig.node.json" }
   ]
 }
diff --git a/packages/trackerless-network/tsconfig.proto.json b/packages/trackerless-network/tsconfig.proto.json
new file mode 100644
index 0000000000..16cd49bd0e
--- /dev/null
+++ b/packages/trackerless-network/tsconfig.proto.json
@@ -0,0 +1,9 @@
+{
+  "extends": "../../tsconfig.proto.json",
+  "compilerOptions": {
+    "outDir": "dist"
+  },
+  "include": [
+    "generated"
+  ]
+}
diff --git a/tsconfig.proto.json b/tsconfig.proto.json
new file mode 100644
index 0000000000..ee7849f7fa
--- /dev/null
+++ b/tsconfig.proto.json
@@ -0,0 +1,6 @@
+{
+  "extends": "./tsconfig.node.json",
+  "compilerOptions": {
+    "noImplicitOverride": false
+  }
+}