diff --git a/package.json b/package.json
index 05ef9b0..b2e56f7 100644
--- a/package.json
+++ b/package.json
@@ -21,7 +21,7 @@
     "test": "jest --config jest.config.json --passWithNoTests --coverage",
     "build:esm": "tsc --project tsconfig.esm.json",
     "build:cjs": "tsc --project tsconfig.cjs.json",
-    "build": "yarn clean && yarn build:cjs && yarn build:esm && ./bin/post-build.sh",
+    "build": "yarn build:cjs && yarn build:esm && ./bin/post-build.sh",
     "clean": "rm -rf ./dist/*",
     "format": "prettier --write \"src/**/*.(ts|js)\"",
     "lint": "eslint -c .eslintrc.json --ignore-path .eslintignore --ext .ts src",
diff --git a/src/config/NodeConfig.ts b/src/config/NodeConfig.ts
index 412ce82..412971a 100644
--- a/src/config/NodeConfig.ts
+++ b/src/config/NodeConfig.ts
@@ -1,10 +1,10 @@
 export const NodeConfig: {
-  env: string;
+  env: "production" | "developement" | "testing";
   version: string;
   modules: string[];
   yarnVersion: string;
 } = {
-  env: process.env.NODE_ENV as string,
+  env: process.env.NODE_ENV as "production" | "developement" | "testing",
   version: process.env.NODE_VERSION as string,
   modules: Object.keys(process.env)
     .filter(m => /npm_package_dependencies_/g.test(m))