diff --git a/package.json b/package.json
index 1221b85..51d17b1 100644
--- a/package.json
+++ b/package.json
@@ -17,8 +17,8 @@
     "start": "nodemon --exec \"clear && ts-node src/main.ts && ../../wabt/out/wasm2wast example.wasm && ../../wabt/out/wasm-interp example.wasm\" --watch src -e ts,js",
     "build": "tsc",
     "watch": "tsc -w",
-    "test": "npm run build:wasm-mocks && jest",
-    "test:watch": "nodemon --exec \"npm run build:wasm-mocks && jest --watchAll\" --watch test -e wast",
+    "test": "tsc --noEmit && npm run build:wasm-mocks && jest",
+    "test:watch": "nodemon --exec \"tsc --noEmit && npm run build:wasm-mocks && jest --watchAll\" --watch test -e wast,ts --watch src",
     "build:third-party": "cd third-party/wabt && make",
     "build:wasm-mocks": "scripts/build/wasm-mocks.sh",
     "clean:wasm-mocks": "rm test/*.wasm",
@@ -29,6 +29,7 @@
     "transform": {
       ".ts": "<rootDir>/node_modules/ts-jest/preprocessor.js"
     },
+    "testResultsProcessor": "<rootDir>/node_modules/ts-jest/coverageprocessor.js",
     "testRegex": "test/.*.ts$",
     "moduleFileExtensions": [
       "ts",
diff --git a/tsconfig.json b/tsconfig.json
index 9edcb83..7cf8dff 100644
--- a/tsconfig.json
+++ b/tsconfig.json
@@ -4,6 +4,7 @@
     "target": "es6",
     "sourceMap": true,
     "strictNullChecks": true,
+    "noEmitOnError": true,
     "types": [
       "node"
     ],