diff --git a/babel.config.json b/babel.config.json
new file mode 100644
index 0000000..813a474
--- /dev/null
+++ b/babel.config.json
@@ -0,0 +1,3 @@
+{
+  "presets": [["@babel/preset-env", { "targets": { "node": "current" } }], "@babel/preset-typescript"]
+}
diff --git a/jest.config.json b/jest.config.json
deleted file mode 100644
index d2f5206..0000000
--- a/jest.config.json
+++ /dev/null
@@ -1,12 +0,0 @@
-{
-  "projects": ["<rootDir>/packages/*"],
-  "collectCoverageFrom": ["<rootDir>/src/**/*.ts"],
-  "coverageThreshold": {
-    "global": {
-      "branches": 20,
-      "functions": 30,
-      "lines": 30,
-      "statements": 30
-    }
-  }
-}
diff --git a/jest.config.ts b/jest.config.ts
new file mode 100644
index 0000000..01993f7
--- /dev/null
+++ b/jest.config.ts
@@ -0,0 +1,26 @@
+import fs from "fs"
+import type { Config } from "@jest/types"
+
+const projects = fs
+  .readdirSync("./packages", { withFileTypes: true })
+  .filter((directory) => directory.isDirectory())
+  .map(({ name }) => ({
+    rootDir: `packages/${name}`,
+    displayName: name,
+    moduleNameMapper: {
+      "@zk-kit/types": "<rootDir>/../../types/zk-kit/index.d.ts"
+    }
+  }))
+
+export default async (): Promise<Config.InitialOptions> => ({
+  projects,
+  collectCoverageFrom: ["<rootDir>/src/**/*.ts", "!<rootDir>/src/**/index.ts", "!<rootDir>/src/**/*.d.ts"],
+  coverageThreshold: {
+    global: {
+      branches: 20,
+      functions: 30,
+      lines: 30,
+      statements: 30
+    }
+  }
+})
diff --git a/package.json b/package.json
index 2122a3c..bf714df 100644
--- a/package.json
+++ b/package.json
@@ -7,13 +7,13 @@
   "bugs": "https://github.com/appliedzkp/zk-kit/issues",
   "private": true,
   "scripts": {
-    "install": "npm run bootstrap && npm run build",
-    "bootstrap": "lerna bootstrap --no-ci",
+    "install": "yarn bootstrap && yarn build",
+    "bootstrap": "lerna bootstrap",
     "build": "lerna run build",
     "build:watch": "lerna run --parallel build:watch -- -- --watch",
     "test": "jest --coverage",
     "test:watch": "jest --coverage --watch",
-    "test:prod": "npm run lint && npm test",
+    "test:prod": "yarn lint && yarn test",
     "lint": "eslint . --ext .js,.jsx,.ts,.tsx",
     "lint:fix": "eslint . --ext .js,.jsx,.ts,.tsx --fix",
     "prettier": "prettier -c .",
@@ -32,6 +32,9 @@
     "circom"
   ],
   "devDependencies": {
+    "@babel/core": "^7.16.7",
+    "@babel/preset-env": "^7.16.8",
+    "@babel/preset-typescript": "^7.16.7",
     "@commitlint/cli": "^16.0.2",
     "@commitlint/config-conventional": "^16.0.0",
     "@rollup/plugin-typescript": "^8.3.0",
@@ -39,6 +42,7 @@
     "@types/node": "^17.0.9",
     "@typescript-eslint/eslint-plugin": "^5.9.1",
     "@typescript-eslint/parser": "^5.9.1",
+    "babel-jest": "^27.4.6",
     "benny": "^3.7.1",
     "commitizen": "^4.2.4",
     "cz-conventional-changelog": "^3.3.0",
@@ -51,7 +55,6 @@
     "prettier": "^2.5.1",
     "rimraf": "^3.0.2",
     "rollup": "^2.64.0",
-    "ts-jest": "^27.1.3",
     "ts-node": "^10.4.0",
     "tslib": "^2.3.1",
     "typescript": "^4.5.4"
diff --git a/packages/identity/jest.config.json b/packages/identity/jest.config.json
deleted file mode 100644
index a46df71..0000000
--- a/packages/identity/jest.config.json
+++ /dev/null
@@ -1,6 +0,0 @@
-{
-  "displayName": "identity",
-  "transform": {
-    "\\.ts$": "ts-jest"
-  }
-}
diff --git a/packages/incremental-merkle-tree/jest.config.json b/packages/incremental-merkle-tree/jest.config.json
deleted file mode 100644
index cd92765..0000000
--- a/packages/incremental-merkle-tree/jest.config.json
+++ /dev/null
@@ -1,6 +0,0 @@
-{
-  "displayName": "incremental-merkle-tree",
-  "transform": {
-    "\\.ts$": "ts-jest"
-  }
-}
diff --git a/packages/protocols/jest.config.json b/packages/protocols/jest.config.json
deleted file mode 100644
index ca4facb..0000000
--- a/packages/protocols/jest.config.json
+++ /dev/null
@@ -1,7 +0,0 @@
-{
-  "displayName": "protocols",
-  "transform": {
-    "\\.ts$": "ts-jest"
-  },
-  "preset": "ts-jest/presets/js-with-ts-esm"
-}
diff --git a/packages/sparse-merkle-tree/jest.config.json b/packages/sparse-merkle-tree/jest.config.json
deleted file mode 100644
index 3b1616f..0000000
--- a/packages/sparse-merkle-tree/jest.config.json
+++ /dev/null
@@ -1,6 +0,0 @@
-{
-  "displayName": "sparse-merkle-tree",
-  "transform": {
-    "\\.ts$": "ts-jest"
-  }
-}