diff --git a/.eslintrc.json b/.eslintrc.json
index c8c67ee3..ba8240fa 100755
--- a/.eslintrc.json
+++ b/.eslintrc.json
@@ -78,6 +78,12 @@
           { "allow": ["arrowFunctions"] }
         ]
       }
+    },
+    {
+      "files": ["src/polyfills/**"],
+      "rules": {
+        "@typescript-eslint/no-explicit-any": "off"
+      }
     }
   ],
   "settings": {
diff --git a/.github/workflows/ci_lint.yml b/.github/workflows/ci_lint.yml
index b06e8b49..474df9e2 100644
--- a/.github/workflows/ci_lint.yml
+++ b/.github/workflows/ci_lint.yml
@@ -33,8 +33,11 @@ jobs:
       - name: 📦 Installing Dependencies
         run: npm ci
 
+      - name: 🤹🏻‍♀️ Biome Check
+        run: npm run biome:check
+
       - name: 🤹🏻‍♀️ ESLint Check
-        run: npm run eslint:checker
+        run: npm run eslint:check
 
       - name: 🤹🏻‍♀️ Prettier Check
-        run: npm run prettier:checker
+        run: npm run prettier:check
diff --git a/.nycrc b/.nycrc
index 86335595..49b06f22 100644
--- a/.nycrc
+++ b/.nycrc
@@ -6,6 +6,7 @@
     "src/bin",
     "src/configs",
     "src/polyfills",
+    "src/index.ts",
     "benchmark",
     "ci",
     "fixtures",
diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
index d5d31d97..7824b57b 100644
--- a/CONTRIBUTING.md
+++ b/CONTRIBUTING.md
@@ -139,7 +139,7 @@ npm run test:ci
 ### Lint
 
 ```sh
-npm run lint:checker
+npm run lint:check
 ```
 
 > Also
diff --git a/biome.json b/biome.json
index 59a2af71..0fbca6d8 100644
--- a/biome.json
+++ b/biome.json
@@ -1,6 +1,7 @@
 {
   "$schema": "https://biomejs.dev/schemas/1.8.2/schema.json",
   "files": {
+    "include": ["**/**"],
     "ignore": [
       "node_modules",
       "lib",
@@ -43,7 +44,6 @@
       },
       "suspicious": {
         "all": true,
-        "noAsyncPromiseExecutor": "off",
         "noEmptyBlockStatements": "off",
         "noConsoleLog": "off"
       },
@@ -72,7 +72,7 @@
       }
     },
     {
-      "include": ["src/polyfills"],
+      "include": ["src/polyfills/**/**"],
       "linter": {
         "rules": {
           "suspicious": {
diff --git a/package.json b/package.json
index 7b7c1d04..290a266f 100644
--- a/package.json
+++ b/package.json
@@ -3,6 +3,7 @@
   "version": "1.20.0",
   "description": "🐷 Poku makes testing easy for Node.js, Bun, Deno, and you at the same time.",
   "license": "MIT",
+  "type": "commonjs",
   "main": "./lib/index.js",
   "bin": {
     "poku": "./lib/bin/index.js"
@@ -47,11 +48,12 @@
     "build": "tsc && tsc -p tsconfig.test.json",
     "postbuild": "tsx tools/compatibility/node.ts && shx cp fixtures/server/package.json ci/fixtures/server/package.json && npm run build:deno && shx chmod +x lib/bin/index.js",
     "build:deno": "esbuild src/polyfills/deno.mts --outfile=lib/polyfills/deno.mjs --format=esm",
-    "eslint:checker": "eslint . --ext .js,.ts",
+    "biome:check": "npx @biomejs/biome lint",
+    "eslint:check": "eslint . --ext .js,.ts",
     "eslint:fix": "eslint . --fix --config .eslintrc.json",
-    "lint:checker": "npm run eslint:checker && npm run prettier:checker",
+    "lint:check": "npm run biome:check && npm run eslint:check && npm run prettier:check",
     "lint:fix": "npm run eslint:fix && npm run prettier:fix",
-    "prettier:checker": "prettier --check .",
+    "prettier:check": "prettier --check .",
     "prettier:fix": "prettier --write .github/workflows/*.yml .",
     "update": "pu minor && npm i && npm audit fix",
     "postupdate": "npm run lint:fix",
diff --git a/src/index.ts b/src/index.ts
index 9a30d6c8..beb97b65 100755
--- a/src/index.ts
+++ b/src/index.ts
@@ -1,10 +1,5 @@
-/* c8 ignore start */
-
-// Essentials
 export { poku } from './modules/poku.js';
 export { assert } from './modules/assert.js';
-
-// Helpers
 export { test } from './modules/test.js';
 export { describe } from './modules/describe.js';
 export { it } from './modules/it.js';
@@ -21,8 +16,6 @@ export { exit } from './modules/exit.js';
 export { log } from './modules/log.js';
 export { publicListFiles as listFiles } from './modules/list-files-sync.js';
 export { assertPromise } from './modules/assert-promise.js';
-
-// Types
 export type { Code } from './@types/code.js';
 export type { Configs } from './@types/poku.js';
 export type {
@@ -38,5 +31,3 @@ export type {
   WaitForPortOptions,
 } from './@types/wait-for.js';
 export type { Configs as ListFilesConfigs } from './@types/list-files.js';
-
-/* c8 ignore stop */
diff --git a/src/polyfills/object.ts b/src/polyfills/object.ts
index 9a39e3a6..49b2bdd9 100644
--- a/src/polyfills/object.ts
+++ b/src/polyfills/object.ts
@@ -1,4 +1,3 @@
-// eslint-disable-next-line @typescript-eslint/no-explicit-any
 export const entries = (obj: { [key: string]: any }): [string, unknown][] => {
   const ownProps = Object.keys(obj);
   let i = ownProps.length;
diff --git a/src/services/run-test-file.ts b/src/services/run-test-file.ts
index a783d3c9..69cb1e78 100644
--- a/src/services/run-test-file.ts
+++ b/src/services/run-test-file.ts
@@ -13,50 +13,49 @@ import { beforeEach, afterEach } from './each.js';
 const cwd = processCWD();
 
 /* c8 ignore next */ // c8 bug
-export const runTestFile = (
+export const runTestFile = async (
   filePath: string,
   configs?: Configs
-): Promise<boolean> =>
-  new Promise(async (resolve) => {
-    /* c8 ignore start */
-    const runtimeOptions = runner(filePath, configs);
-    const runtime = runtimeOptions.shift()!;
-    const runtimeArguments = [
-      ...runtimeOptions,
-      configs?.deno?.cjs === true ||
-      (Array.isArray(configs?.deno?.cjs) &&
-        configs.deno.cjs.some((ext) => filePath.includes(ext)))
-        ? 'https://cdn.jsdelivr.net/npm/poku/lib/polyfills/deno.mjs'
-        : filePath,
-    ];
-    /* c8 ignore stop */
-
-    const fileRelative = relative(cwd, filePath);
-    const showLogs = !isQuiet(configs);
-
-    let output = '';
-
-    const stdOut = (data: Buffer): void => {
-      output += String(data);
-    };
-
-    if (!configs?.parallel) {
-      showLogs &&
-        write(
-          `${indentation.test}${format('●').info().dim()} ${format(fileRelative).dim()}`
-        );
-    }
-
-    const start = hrtime();
-    let end: ReturnType<typeof hrtime>;
-
-    /* c8 ignore start */
-    if (!(await beforeEach(fileRelative, configs))) {
-      return false;
-    }
-    /* c8 ignore stop */
-
-    // Export spawn helper is not an option
+): Promise<boolean> => {
+  /* c8 ignore start */ // multi-platform
+  const runtimeOptions = runner(filePath, configs);
+  const runtime = runtimeOptions.shift()!;
+  const runtimeArguments = [
+    ...runtimeOptions,
+    configs?.deno?.cjs === true ||
+    (Array.isArray(configs?.deno?.cjs) &&
+      configs.deno.cjs.some((ext) => filePath.includes(ext)))
+      ? 'https://cdn.jsdelivr.net/npm/poku/lib/polyfills/deno.mjs'
+      : filePath,
+  ];
+  /* c8 ignore stop */
+
+  const fileRelative = relative(cwd, filePath);
+  const showLogs = !isQuiet(configs);
+
+  let output = '';
+
+  const stdOut = (data: Buffer): void => {
+    output += String(data);
+  };
+
+  if (!configs?.parallel) {
+    showLogs &&
+      write(
+        `${indentation.test}${format('●').info().dim()} ${format(fileRelative).dim()}`
+      );
+  }
+
+  const start = hrtime();
+  let end: ReturnType<typeof hrtime>;
+
+  /* c8 ignore start */
+  if (!(await beforeEach(fileRelative, configs))) {
+    return false;
+  }
+  /* c8 ignore stop */
+
+  return new Promise((resolve) => {
     const child = spawn(runtime, runtimeArguments, {
       stdio: ['inherit', 'pipe', 'pipe'],
       /* c8 ignore next */
@@ -68,7 +67,6 @@ export const runTestFile = (
     });
 
     child.stdout.on('data', stdOut);
-
     child.stderr.on('data', stdOut);
 
     child.on('close', async (code) => {
@@ -86,7 +84,8 @@ export const runTestFile = (
 
       /* c8 ignore start */
       if (!(await afterEach(fileRelative, configs))) {
-        return false;
+        resolve(false);
+        return;
       }
       /* c8 ignore stop */
 
@@ -114,3 +113,4 @@ export const runTestFile = (
     });
     /* c8 ignore stop */
   });
+};
diff --git a/src/services/run-tests.ts b/src/services/run-tests.ts
index fdc93966..34d8ef2f 100644
--- a/src/services/run-tests.ts
+++ b/src/services/run-tests.ts
@@ -1,4 +1,4 @@
-/* c8 ignore start */ // c8 bug (incompatibility) =>
+/* c8 ignore start */ // c8 bug (incompatibility)
 /**
  * This service is strictly tested, but these tests use deep child process for it
  */
diff --git a/tsconfig.json b/tsconfig.json
index 4b792018..422d30d1 100755
--- a/tsconfig.json
+++ b/tsconfig.json
@@ -2,8 +2,8 @@
   "include": ["src"],
   "exclude": ["test", "tools", "src/@types"],
   "compilerOptions": {
-    "target": "ES2015",
-    "lib": ["ES2015"],
+    "target": "ES2016",
+    "lib": ["ES2016"],
     "module": "CommonJS",
     "moduleResolution": "Node",
     "outDir": "lib",