diff --git a/package.json b/package.json
index 738dc08..2d80712 100644
--- a/package.json
+++ b/package.json
@@ -14,6 +14,7 @@
     "cleanup": "prettier --write src --parser typescript",
     "test": "jest --silent --runInBand",
     "release": "sh scripts/release.sh",
+    "preinstall": "sh scripts/yarn.sh",
     "prepare": "husky install"
   },
   "repository": {
@@ -76,6 +77,7 @@
     "rollup-plugin-terser": "^7.0.2",
     "rollup-plugin-typescript2": "^0.30.0",
     "ts-jest": "^26.4.2",
-    "typescript": "next"
+    "tslib": "^2.2.0",
+    "typescript": "^4.2.4"
   }
 }
diff --git a/scripts/release.sh b/scripts/release.sh
index ed9e885..b9fedf6 100644
--- a/scripts/release.sh
+++ b/scripts/release.sh
@@ -1,4 +1,12 @@
 #!/bin/sh
+YELLOW_COLOR="\u001b[33m"
+GREEN_COLOR="\033[0;32m"
+RESET_COLOR="\u001b[39m"
+
+printf "${YELLOW_COLOR}Checking for errors...${RESET_COLOR}\n"
 source scripts/check.sh
+printf "${GREEN_COLOR}No errors found.${RESET_COLOR}\n"
+printf "${YELLOW_COLOR}Building distribution bundles...${RESET_COLOR}\n"
 source scripts/build.sh
-printf "\n\n\033[1;31m[!] \033[0;33mPlease run \033[0m\`\033[1;36mnp\033[0m\`\n\n"
+printf "${GREEN_COLOR}Built distribution bundles.${RESET_COLOR}\n"
+printf "${YELLOW_COLOR}Please run \`np\` manually to publish the package.${RESET_COLOR}"
diff --git a/scripts/yarn.sh b/scripts/yarn.sh
new file mode 100644
index 0000000..2f0ff5a
--- /dev/null
+++ b/scripts/yarn.sh
@@ -0,0 +1,8 @@
+#!/bin/sh
+YELLOW_COLOR="\u001b[33m"
+RESET_COLOR="\u001b[39m"
+
+if [[ $npm_execpath != *"yarn"* ]]; then
+  printf "${YELLOW_COLOR}This repository requires Yarn 1.x for scripts to work properly.${RESET_COLOR}\n\n"
+  exit 1
+fi
diff --git a/yarn.lock b/yarn.lock
index 91d7569..fec5e36 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -6465,6 +6465,11 @@ tslib@^1.8.1, tslib@^1.9.0:
   resolved "https://registry.yarnpkg.com/tslib/-/tslib-1.14.1.tgz#cf2d38bdc34a134bcaf1091c41f6619e2f672d00"
   integrity sha512-Xni35NKzjgMrwevysHTCArtLDpPvye8zV/0E4EyYn43P7/7qvQwPh9BGkHewbMulVntbigmcT7rdX3BNo9wRJg==
 
+tslib@^2.2.0:
+  version "2.2.0"
+  resolved "https://registry.yarnpkg.com/tslib/-/tslib-2.2.0.tgz#fb2c475977e35e241311ede2693cee1ec6698f5c"
+  integrity sha512-gS9GVHRU+RGn5KQM2rllAlR3dU6m7AcpJKdtH8gFvQiC4Otgk98XnmMU+nZenHt/+VhnBPWwgrJsyrdcw6i23w==
+
 tsutils@^3.17.1:
   version "3.21.0"
   resolved "https://registry.yarnpkg.com/tsutils/-/tsutils-3.21.0.tgz#b48717d394cea6c1e096983eed58e9d61715b623"
@@ -6545,10 +6550,10 @@ typedarray-to-buffer@^3.1.5:
   dependencies:
     is-typedarray "^1.0.0"
 
-typescript@next:
-  version "4.3.0-dev.20210506"
-  resolved "https://registry.yarnpkg.com/typescript/-/typescript-4.3.0-dev.20210506.tgz#65279fe5746ae4d82397f8ee82c16024e78e1e8c"
-  integrity sha512-91ypOFD5hHQrmldSns8/oIq9VZ0rpA/t5NC6M9b5ZLcUz6tSF66wDqIBs6fu/yOwvOd7oozYEEC5nuBfItMAsQ==
+typescript@^4.2.4:
+  version "4.2.4"
+  resolved "https://registry.yarnpkg.com/typescript/-/typescript-4.2.4.tgz#8610b59747de028fda898a8aef0e103f156d0961"
+  integrity sha512-V+evlYHZnQkaz8TRBuxTA92yZBPotr5H+WhQ7bD3hZUndx5tGOa1fuCgeSjxAzM1RiN5IzvadIXTVefuuwZCRg==
 
 unicode-canonical-property-names-ecmascript@^1.0.4:
   version "1.0.4"