diff --git a/web3.js/.travis/script.sh b/web3.js/.travis/script.sh
index a510b6c63..fcc4fdec9 100644
--- a/web3.js/.travis/script.sh
+++ b/web3.js/.travis/script.sh
@@ -9,7 +9,6 @@ ls -l lib
 test -r lib/index.iife.js
 test -r lib/index.cjs.js
 test -r lib/index.esm.js
-npm run doc
-npm run lint
+npm run ok
 npm run codecov
 npm run test:live-with-test-validator
diff --git a/web3.js/package.json b/web3.js/package.json
index 1e09ee2de..8ca9fa0fa 100644
--- a/web3.js/package.json
+++ b/web3.js/package.json
@@ -48,7 +48,8 @@
     "type:gen": "./scripts/typegen.sh",
     "lint": "set -ex; npm run pretty; eslint . --ext .js,.ts",
     "lint:fix": "npm run pretty:fix && eslint . --fix --ext .js,.ts",
-    "ok": "run-s lint test doc",
+    "type:check": "tsc -p tsconfig.json --noEmit",
+    "ok": "run-s lint test doc type:check",
     "pretty": "prettier --check '{,{src,test}/**/}*.{j,t}s'",
     "pretty:fix": "prettier --write '{,{src,test}/**/}*.{j,t}s'",
     "re": "semantic-release --repository-url git@github.com:solana-labs/solana-web3.js.git",
diff --git a/web3.js/src/connection.ts b/web3.js/src/connection.ts
index 9212203c2..f9ed8fb4d 100644
--- a/web3.js/src/connection.ts
+++ b/web3.js/src/connection.ts
@@ -1,7 +1,6 @@
 import bs58 from 'bs58';
 import {Buffer} from 'buffer';
 import fetch from 'cross-fetch';
-import type {Response} from 'cross-fetch';
 import {
   type as pick,
   number,
diff --git a/web3.js/tsconfig.json b/web3.js/tsconfig.json
index 8564dad9d..f588ae884 100644
--- a/web3.js/tsconfig.json
+++ b/web3.js/tsconfig.json
@@ -14,7 +14,9 @@
     "isolatedModules": true,
     "baseUrl": "src",
     "noFallthroughCasesInSwitch": true,
-    "noImplicitReturns": true
+    "noImplicitReturns": true,
+    "noUnusedParameters": true,
+    "noUnusedLocals": true
   },
   "include": ["src"]
 }