diff --git a/developer-extension/tsconfig.webpack.json b/developer-extension/tsconfig.webpack.json
index 41883bbadd..6a375dfe5e 100644
--- a/developer-extension/tsconfig.webpack.json
+++ b/developer-extension/tsconfig.webpack.json
@@ -3,12 +3,14 @@
 
   "compilerOptions": {
     "baseUrl": ".",
-    "module": "ES6",
+    "module": "preserve",
     "target": "esnext",
     "jsx": "react",
     "lib": ["ES2022", "DOM"],
     "types": ["chrome", "react", "react-dom", "jasmine"],
-    "skipLibCheck": true
+    "skipLibCheck": true,
+    "allowImportingTsExtensions": true,
+    "noEmit": true
   },
 
   "include": ["src"]
diff --git a/developer-extension/webpack.config.ts b/developer-extension/webpack.config.mts
similarity index 100%
rename from developer-extension/webpack.config.ts
rename to developer-extension/webpack.config.mts
diff --git a/eslint-local-rules/disallowEnumExports.js b/eslint-local-rules/disallowEnumExports.js
index 0d6ab50689..5fc2ae3a4e 100644
--- a/eslint-local-rules/disallowEnumExports.js
+++ b/eslint-local-rules/disallowEnumExports.js
@@ -1,4 +1,4 @@
-const { SymbolFlags } = require('typescript')
+import { SymbolFlags } from 'typescript'
 
 /**
  * This rule forbids exporting 'enums'.  It serves two purposes:
@@ -34,7 +34,7 @@ const { SymbolFlags } = require('typescript')
  * [1]: https://www.typescriptlang.org/tsconfig#isolatedModules
  * [2]: https://www.typescriptlang.org/docs/handbook/release-notes/typescript-3-8.html#type-only-imports-and-export
  */
-module.exports = {
+export default {
   meta: {
     docs: {
       description: 'Disallow export of enums.',
diff --git a/eslint-local-rules/disallowGenericUtils.js b/eslint-local-rules/disallowGenericUtils.js
index 3483981ded..13cc076fda 100644
--- a/eslint-local-rules/disallowGenericUtils.js
+++ b/eslint-local-rules/disallowGenericUtils.js
@@ -1,6 +1,6 @@
-const path = require('path')
+import path from 'path'
 
-module.exports = {
+export default {
   meta: {
     docs: {
       description: 'Disallow the use of too generic utility file names',
diff --git a/eslint-local-rules/disallowNonScripts.js b/eslint-local-rules/disallowNonScripts.js
index 0d530e83b0..817495c14b 100644
--- a/eslint-local-rules/disallowNonScripts.js
+++ b/eslint-local-rules/disallowNonScripts.js
@@ -1,4 +1,4 @@
-module.exports = {
+export default {
   meta: {
     docs: {
       description: 'Disallow JS files that are not used as a "script"',
diff --git a/eslint-local-rules/disallowProtectedDirectoryImport.js b/eslint-local-rules/disallowProtectedDirectoryImport.js
index f4ef8bbb4b..d35adc909b 100644
--- a/eslint-local-rules/disallowProtectedDirectoryImport.js
+++ b/eslint-local-rules/disallowProtectedDirectoryImport.js
@@ -1,10 +1,15 @@
-const path = require('path')
-const { minimatch } = require('minimatch')
-const resolve = require('eslint-module-utils/resolve').default
-const moduleVisitor = require('eslint-module-utils/moduleVisitor').default
-const importType = require('eslint-plugin-import/lib/core/importType').default
+import path from 'node:path'
+import { minimatch } from 'minimatch'
 
-module.exports = {
+import resolvePackage from 'eslint-module-utils/resolve.js'
+import moduleVisitorPackage from 'eslint-module-utils/moduleVisitor.js'
+import importTypePackage from 'eslint-plugin-import/lib/core/importType.js'
+
+const moduleVisitor = moduleVisitorPackage.default
+const importType = importTypePackage.default
+const resolve = resolvePackage.default
+
+export default {
   meta: {
     docs: {
       description:
diff --git a/eslint-local-rules/disallowSideEffects.js b/eslint-local-rules/disallowSideEffects.js
index f02fc9e968..5f24299ede 100644
--- a/eslint-local-rules/disallowSideEffects.js
+++ b/eslint-local-rules/disallowSideEffects.js
@@ -1,6 +1,6 @@
-const path = require('path')
+import path from 'path'
 
-module.exports = {
+export default {
   meta: {
     docs: {
       description:
@@ -22,7 +22,7 @@ module.exports = {
   },
 }
 
-const packagesRoot = path.resolve(__dirname, '..', 'packages')
+const packagesRoot = path.resolve(import.meta.dirname, '..', 'packages')
 
 // Those modules are known to have side effects when evaluated
 const pathsWithSideEffect = new Set([
diff --git a/eslint-local-rules/disallowSpecImport.js b/eslint-local-rules/disallowSpecImport.js
index 9c14f4cb18..861b8d29b3 100644
--- a/eslint-local-rules/disallowSpecImport.js
+++ b/eslint-local-rules/disallowSpecImport.js
@@ -1,4 +1,4 @@
-module.exports = {
+export default {
   meta: {
     docs: {
       description: 'Disallow importing spec file code to avoid to execute the tests from the imported spec file twice',
diff --git a/eslint-local-rules/disallowTestImportExportFromSrc.js b/eslint-local-rules/disallowTestImportExportFromSrc.js
index c7c52c4c38..c77e14a9a2 100644
--- a/eslint-local-rules/disallowTestImportExportFromSrc.js
+++ b/eslint-local-rules/disallowTestImportExportFromSrc.js
@@ -1,4 +1,4 @@
-module.exports = {
+export default {
   meta: {
     docs: {
       description:
diff --git a/eslint-local-rules/disallowUrlConstructorPatchValues.js b/eslint-local-rules/disallowUrlConstructorPatchValues.js
index 2edde3d6a7..b9748056d2 100644
--- a/eslint-local-rules/disallowUrlConstructorPatchValues.js
+++ b/eslint-local-rules/disallowUrlConstructorPatchValues.js
@@ -1,4 +1,4 @@
-module.exports = {
+export default {
   meta: {
     docs: {
       description: 'Disallow problematic URL constructor patched values.',
diff --git a/eslint-local-rules/disallowZoneJsPatchedValues.js b/eslint-local-rules/disallowZoneJsPatchedValues.js
index a4a2311f4a..7dbe8b248e 100644
--- a/eslint-local-rules/disallowZoneJsPatchedValues.js
+++ b/eslint-local-rules/disallowZoneJsPatchedValues.js
@@ -19,7 +19,7 @@ const PROBLEMATIC_IDENTIFIERS = {
   removeEventListener: 'Use `addEventListener().stop` from @datadog/browser-core instead',
 }
 
-module.exports = {
+export default {
   meta: {
     docs: {
       description: 'Disallow problematic ZoneJs patched values.',
diff --git a/eslint-local-rules/enforceProdDepsImports.js b/eslint-local-rules/enforceProdDepsImports.js
index 26ba27e88c..42ca104bef 100644
--- a/eslint-local-rules/enforceProdDepsImports.js
+++ b/eslint-local-rules/enforceProdDepsImports.js
@@ -1,7 +1,12 @@
-const fs = require('fs')
-const moduleVisitor = require('eslint-module-utils/moduleVisitor').default
-const importType = require('eslint-plugin-import/lib/core/importType').default
-const pkgUp = require('eslint-module-utils/pkgUp').default
+import fs from 'node:fs'
+
+import moduleVisitorPackage from 'eslint-module-utils/moduleVisitor.js'
+import importTypePackage from 'eslint-plugin-import/lib/core/importType.js'
+import pkgUpPackage from 'eslint-module-utils/pkgUp.js'
+
+const moduleVisitor = moduleVisitorPackage.default
+const pkgUp = pkgUpPackage.default
+const importType = importTypePackage.default
 
 // The import/no-extraneous-dependencies rule cannot catch this issue[1] where we imported an
 // aliased package in production code, because it resolves[2] the alias to the real package name, and
@@ -15,7 +20,7 @@ const pkgUp = require('eslint-module-utils/pkgUp').default
 
 const packageJsonCache = new Map()
 
-module.exports = {
+export default {
   meta: {
     docs: {
       description: 'Forbids importing non-prod dependencies in prod files',
diff --git a/eslint-local-rules/index.js b/eslint-local-rules/index.js
index 3fbbaf62bf..6f9134d952 100644
--- a/eslint-local-rules/index.js
+++ b/eslint-local-rules/index.js
@@ -1,3 +1,16 @@
+import disallowSideEffects from './disallowSideEffects.js'
+import disallowEnumExports from './disallowEnumExports.js'
+import disallowSpecImport from './disallowSpecImport.js'
+import disallowProtectedDirectoryImport from './disallowProtectedDirectoryImport.js'
+import disallowTestImportExportFromSrc from './disallowTestImportExportFromSrc.js'
+import disallowZoneJsPatchedValues from './disallowZoneJsPatchedValues.js'
+import disallowUrlConstructorPatchValues from './disallowUrlConstructorPatchValues.js'
+import disallowGenericUtils from './disallowGenericUtils.js'
+import disallowNonScripts from './disallowNonScripts.js'
+import enforceProdDepsImports from './enforceProdDepsImports.js'
+import secureCommandExecution from './secureCommandExecution.js'
+import monitorUntilCommentRules from './monitorUntilCommentRules.js'
+
 // Declare the local rules used by the Browser SDK
 //
 // See https://eslint.org/docs/developer-guide/working-with-rules for documentation on how to write
@@ -6,17 +19,17 @@
 // You can use https://astexplorer.net/ to explore the parsed data structure of a code snippet.
 // Choose '@typescript-eslint/parser' as a parser to have the exact same structure as our ESLint
 // parser.
-module.exports = {
-  'disallow-side-effects': require('./disallowSideEffects'),
-  'disallow-enum-exports': require('./disallowEnumExports'),
-  'disallow-spec-import': require('./disallowSpecImport'),
-  'disallow-protected-directory-import': require('./disallowProtectedDirectoryImport'),
-  'disallow-test-import-export-from-src': require('./disallowTestImportExportFromSrc'),
-  'disallow-zone-js-patched-values': require('./disallowZoneJsPatchedValues'),
-  'disallow-url-constructor-patched-values': require('./disallowUrlConstructorPatchValues.js'),
-  'disallow-generic-utils': require('./disallowGenericUtils'),
-  'disallow-non-scripts': require('./disallowNonScripts'),
-  'enforce-prod-deps-imports': require('./enforceProdDepsImports.js'),
-  'secure-command-execution': require('./secureCommandExecution'),
-  ...require('./monitorUntilCommentRules'),
+export default {
+  'disallow-side-effects': disallowSideEffects,
+  'disallow-enum-exports': disallowEnumExports,
+  'disallow-spec-import': disallowSpecImport,
+  'disallow-protected-directory-import': disallowProtectedDirectoryImport,
+  'disallow-test-import-export-from-src': disallowTestImportExportFromSrc,
+  'disallow-zone-js-patched-values': disallowZoneJsPatchedValues,
+  'disallow-url-constructor-patched-values': disallowUrlConstructorPatchValues,
+  'disallow-generic-utils': disallowGenericUtils,
+  'disallow-non-scripts': disallowNonScripts,
+  'enforce-prod-deps-imports': enforceProdDepsImports,
+  'secure-command-execution': secureCommandExecution,
+  ...monitorUntilCommentRules,
 }
diff --git a/eslint-local-rules/monitorUntilCommentRules.js b/eslint-local-rules/monitorUntilCommentRules.js
index 84afdb385f..895230ec7c 100644
--- a/eslint-local-rules/monitorUntilCommentRules.js
+++ b/eslint-local-rules/monitorUntilCommentRules.js
@@ -1,7 +1,7 @@
 const METHODS_TO_CHECK = ['addTelemetryDebug', 'addTelemetryMetrics']
 const MONITOR_COMMENT_FORMAT = /^\s*monitor-until: (\d{4}-\d{2}-\d{2}|forever)/
 
-module.exports = {
+export default {
   'enforce-monitor-until-comment': {
     meta: {
       docs: {
diff --git a/eslint-local-rules/secureCommandExecution.js b/eslint-local-rules/secureCommandExecution.js
index c5e106232b..6baf9a721a 100644
--- a/eslint-local-rules/secureCommandExecution.js
+++ b/eslint-local-rules/secureCommandExecution.js
@@ -1,4 +1,4 @@
-module.exports = {
+export default {
   meta: {
     docs: {
       description: 'Check command execution within nodejs scripts',
diff --git a/eslint.config.mjs b/eslint.config.mjs
index 4a44946d74..ff404c161b 100644
--- a/eslint.config.mjs
+++ b/eslint.config.mjs
@@ -330,7 +330,7 @@ export default tseslint.config(
 
   {
     // JS files. Allow weaker typings since TS can't infer types as accurately as TS files.
-    files: ['**/*.js', '**/*.mjs'],
+    files: ['**/*.{js,mjs}'],
     rules: {
       '@typescript-eslint/no-unsafe-call': 'off',
       '@typescript-eslint/no-unsafe-return': 'off',
@@ -432,9 +432,9 @@ export default tseslint.config(
   },
 
   {
-    files: ['**/webpack.*.ts'],
+    files: ['**/webpack.*.{ts,mts}', 'eslint-local-rules/**/*.js'],
     rules: {
-      // Webpack configuration files are expected to use a default export.
+      // Webpack configuration files and eslint rules files are expected to use a default export.
       'import/no-default-export': 'off',
     },
   },
diff --git a/package.json b/package.json
index f047d52eae..1ee71f5d95 100644
--- a/package.json
+++ b/package.json
@@ -5,8 +5,10 @@
   "workspaces": [
     "packages/*",
     "developer-extension",
-    "performances"
+    "performances",
+    "test/e2e"
   ],
+  "type": "module",
   "scripts": {
     "postinstall": "scripts/cli init_submodule",
     "build": "lerna run build --stream",
@@ -15,7 +17,7 @@
     "build:docs:json": "typedoc --logLevel Verbose --json ./docs.json",
     "build:docs:html": "typedoc --out ./docs",
     "format": "prettier --check .",
-    "lint": "scripts/cli lint .",
+    "lint": "NODE_OPTIONS='--max-old-space-size=4096' eslint .",
     "typecheck": "tsc -b --noEmit true",
     "dev": "node scripts/dev-server.ts",
     "release": "scripts/cli release",
diff --git a/packages/flagging/webpack.config.ts b/packages/flagging/webpack.config.mts
similarity index 100%
rename from packages/flagging/webpack.config.ts
rename to packages/flagging/webpack.config.mts
diff --git a/packages/logs/webpack.config.ts b/packages/logs/webpack.config.mts
similarity index 100%
rename from packages/logs/webpack.config.ts
rename to packages/logs/webpack.config.mts
diff --git a/packages/rum-slim/webpack.config.ts b/packages/rum-slim/webpack.config.mts
similarity index 100%
rename from packages/rum-slim/webpack.config.ts
rename to packages/rum-slim/webpack.config.mts
diff --git a/packages/rum/webpack.config.ts b/packages/rum/webpack.config.mts
similarity index 100%
rename from packages/rum/webpack.config.ts
rename to packages/rum/webpack.config.mts
diff --git a/packages/worker/webpack.config.ts b/packages/worker/webpack.config.mts
similarity index 100%
rename from packages/worker/webpack.config.ts
rename to packages/worker/webpack.config.mts
diff --git a/scripts/cli b/scripts/cli
index f2ffcafd70..614a69738f 100755
--- a/scripts/cli
+++ b/scripts/cli
@@ -26,11 +26,6 @@ cmd_typecheck () {
   tsc -p "$project_path" --noEmit true
 }
 
-cmd_lint () {
-  local project_path="${1}"
-  eslint "$project_path"
-}
-
 cmd_init_submodule () {
   git submodule update --init
 }
diff --git a/scripts/dev-server.ts b/scripts/dev-server.ts
index ba65fc115c..f08be09627 100644
--- a/scripts/dev-server.ts
+++ b/scripts/dev-server.ts
@@ -4,11 +4,11 @@ import HtmlWebpackPlugin from 'html-webpack-plugin'
 import webpack from 'webpack'
 import cors from 'cors'
 import webpackBase from '../webpack.base.ts'
-import logsConfig from '../packages/logs/webpack.config.ts'
-import rumSlimConfig from '../packages/rum-slim/webpack.config.ts'
-import rumConfig from '../packages/rum/webpack.config.ts'
-import flaggingConfig from '../packages/flagging/webpack.config.ts'
-import workerConfig from '../packages/worker/webpack.config.ts'
+import logsConfig from '../packages/logs/webpack.config.mts'
+import rumSlimConfig from '../packages/rum-slim/webpack.config.mts'
+import rumConfig from '../packages/rum/webpack.config.mts'
+import flaggingConfig from '../packages/flagging/webpack.config.mts'
+import workerConfig from '../packages/worker/webpack.config.mts'
 import { printLog, runMain } from './lib/executionUtils.ts'
 
 const sandboxPath = './sandbox'
diff --git a/test/e2e/lib/helpers/playwright.ts b/test/e2e/lib/helpers/playwright.ts
index be5173e471..a6affa5973 100644
--- a/test/e2e/lib/helpers/playwright.ts
+++ b/test/e2e/lib/helpers/playwright.ts
@@ -1,7 +1,7 @@
 import type { PlaywrightWorkerOptions } from '@playwright/test'
 import type { BrowserConfiguration } from '../../../browsers.conf'
-import { getBuildInfos } from '../../../envUtils'
-import packageJson from '../../../../package.json'
+import { getBuildInfos } from '../../../envUtils.ts'
+import packageJson from '../../../../package.json' with { type: 'json' }
 
 export const DEV_SERVER_BASE_URL = 'http://localhost:8080'
 
diff --git a/test/e2e/package.json b/test/e2e/package.json
new file mode 100644
index 0000000000..352055cdf8
--- /dev/null
+++ b/test/e2e/package.json
@@ -0,0 +1,3 @@
+{
+  "private": true
+}
diff --git a/test/e2e/playwright.base.config.ts b/test/e2e/playwright.base.config.ts
index 93ee21fd5f..9bc8fb1a0d 100644
--- a/test/e2e/playwright.base.config.ts
+++ b/test/e2e/playwright.base.config.ts
@@ -30,8 +30,11 @@ export const config: Config = {
   use: {
     trace: isCi ? 'off' : 'retain-on-failure',
   },
+
   webServer: isLocal
     ? {
+        stdout: 'pipe',
+        cwd: path.join(__dirname, '../..'),
         command: 'yarn dev',
         url: DEV_SERVER_BASE_URL,
         reuseExistingServer: true,
diff --git a/test/e2e/tsconfig.json b/test/e2e/tsconfig.json
index 887a50d94b..bd9d2a803a 100644
--- a/test/e2e/tsconfig.json
+++ b/test/e2e/tsconfig.json
@@ -8,9 +8,10 @@
     "moduleResolution": "node",
     "resolveJsonModule": true,
     "target": "ES2022",
-    "module": "ES2020",
+    "module": "preserve",
     "types": ["node", "ajv"],
     "allowJs": true,
-    "noEmit": true
+    "noEmit": true,
+    "allowImportingTsExtensions": true
   }
 }
diff --git a/test/envUtils.d.ts b/test/envUtils.d.ts
deleted file mode 100644
index e436b06bcf..0000000000
--- a/test/envUtils.d.ts
+++ /dev/null
@@ -1,4 +0,0 @@
-export function getIp(): string
-export function getRunId(): string
-export function getBuildInfos(): string
-export function getTestReportDirectory(): string
diff --git a/test/envUtils.js b/test/envUtils.ts
similarity index 65%
rename from test/envUtils.js
rename to test/envUtils.ts
index a67da0b92a..b0a197aaf4 100644
--- a/test/envUtils.js
+++ b/test/envUtils.ts
@@ -1,12 +1,12 @@
-const os = require('os')
+import os from 'os'
 
-function getIp() {
-  return Object.values(os.networkInterfaces())
+export function getIp() {
+  return (Object.values(os.networkInterfaces()) as os.NetworkInterfaceInfo[][])
     .flat()
-    .find(({ family, internal }) => family === 'IPv4' && !internal).address
+    .find(({ family, internal }) => family === 'IPv4' && !internal)!.address
 }
 
-function getBuildInfos() {
+export function getBuildInfos() {
   const ciInfos = getCIInfos()
   if (ciInfos) {
     return ciInfos
@@ -17,8 +17,8 @@ function getBuildInfos() {
   }
 }
 
-function getRunId() {
-  return process.env.CI_JOB_ID || process.env.USER
+export function getRunId() {
+  return process.env.CI_JOB_ID || process.env.USER || 'n/a'
 }
 
 function getCIInfos() {
@@ -32,24 +32,16 @@ function getLocalInfos() {
   return `${process.env.USER} ${new Date().toLocaleString()}`
 }
 
-function getTestReportDirectory() {
+export function getTestReportDirectory() {
   if (process.env.CI_JOB_NAME) {
     return `test-report/${process.env.CI_JOB_NAME}`
   }
 }
 
-function getCoverageReportDirectory() {
+export function getCoverageReportDirectory() {
   if (process.env.CI_JOB_NAME) {
     return `coverage/${process.env.CI_JOB_NAME}`
   }
 
   return 'coverage'
 }
-
-module.exports = {
-  getRunId,
-  getBuildInfos,
-  getIp,
-  getTestReportDirectory,
-  getCoverageReportDirectory,
-}
diff --git a/test/unit/browsers.conf.js b/test/unit/browsers.conf.ts
similarity index 84%
rename from test/unit/browsers.conf.js
rename to test/unit/browsers.conf.ts
index 1b06b9b363..858862ac5c 100644
--- a/test/unit/browsers.conf.js
+++ b/test/unit/browsers.conf.ts
@@ -1,9 +1,8 @@
 // Capabilities: https://www.browserstack.com/automate/capabilities
 
-/**
- * @type {Array<import('../browsers.conf').BrowserConfiguration>}
- */
-const browserConfigurations = [
+import type { BrowserConfiguration } from '../browsers.conf'
+
+export const browserConfigurations: BrowserConfiguration[] = [
   {
     sessionName: 'Edge',
     name: 'Edge',
@@ -47,7 +46,3 @@ const browserConfigurations = [
     device: 'iPhone 13',
   },
 ]
-
-module.exports = {
-  browserConfigurations,
-}
diff --git a/test/unit/jasmineSeedReporterPlugin.js b/test/unit/jasmineSeedReporterPlugin.js
index 3fb7dce313..e43e8ac6c3 100644
--- a/test/unit/jasmineSeedReporterPlugin.js
+++ b/test/unit/jasmineSeedReporterPlugin.js
@@ -9,6 +9,7 @@ function seedReporter(logger) {
 
 seedReporter.$inject = ['logger']
 
-module.exports = {
+// eslint-disable-next-line import/no-default-export
+export default {
   'reporter:jasmine-seed': ['type', seedReporter],
 }
diff --git a/test/unit/karma.base.conf.js b/test/unit/karma.base.conf.js
index 76a346a2f4..4202809aa1 100644
--- a/test/unit/karma.base.conf.js
+++ b/test/unit/karma.base.conf.js
@@ -1,14 +1,17 @@
-const { parseArgs } = require('util')
-const webpackConfig = require('../../webpack.base.ts').default({
+import { parseArgs } from 'node:util'
+import webpackBase from '../../webpack.base.ts'
+
+import { getTestReportDirectory } from '../envUtils.ts'
+import jasmineSeedReporterPlugin from './jasmineSeedReporterPlugin.js'
+import karmaSkippedFailedReporterPlugin from './karmaSkippedFailedReporterPlugin.js'
+import karmaDuplicateTestNameReporterPlugin from './karmaDuplicateTestNameReporterPlugin.js'
+
+const webpackConfig = webpackBase({
   mode: 'development',
   types: ['jasmine', 'chrome'],
   // do not replace some build env variables in unit test in order to test different build behaviors
   keepBuildEnvVariables: ['SDK_VERSION'],
 })
-const { getTestReportDirectory } = require('../envUtils')
-const jasmineSeedReporterPlugin = require('./jasmineSeedReporterPlugin')
-const karmaSkippedFailedReporterPlugin = require('./karmaSkippedFailedReporterPlugin')
-const karmaDuplicateTestNameReporterPlugin = require('./karmaDuplicateTestNameReporterPlugin')
 
 const reporters = ['spec', 'jasmine-seed', 'karma-skipped-failed', 'karma-duplicate-test-name']
 
@@ -30,7 +33,8 @@ const FILES_SPECS = [
   'developer-extension/@(src|test)/**/*.spec.@(ts|tsx)',
 ]
 
-module.exports = {
+// eslint-disable-next-line import/no-default-export
+export default {
   basePath: '../..',
   files: getFiles(),
   frameworks: ['jasmine', 'webpack'],
diff --git a/test/unit/karma.bs.conf.js b/test/unit/karma.bs.conf.js
index 2cd9328717..c6b4314a8c 100644
--- a/test/unit/karma.bs.conf.js
+++ b/test/unit/karma.bs.conf.js
@@ -1,8 +1,9 @@
-const { getBuildInfos } = require('../envUtils')
-const { browserConfigurations } = require('./browsers.conf')
-const karmaBaseConf = require('./karma.base.conf')
+import { getBuildInfos } from '../envUtils.ts'
+import { browserConfigurations } from './browsers.conf.ts'
+import karmaBaseConf from './karma.base.conf.js'
 
-module.exports = function (config) {
+// eslint-disable-next-line import/no-default-export
+export default function (config) {
   config.set({
     ...karmaBaseConf,
     exclude: [
diff --git a/test/unit/karma.local.conf.js b/test/unit/karma.local.conf.js
index 6bba34d0db..cc519e3c94 100644
--- a/test/unit/karma.local.conf.js
+++ b/test/unit/karma.local.conf.js
@@ -1,6 +1,6 @@
-const path = require('path')
-const { getCoverageReportDirectory } = require('../envUtils')
-const karmaBaseConf = require('./karma.base.conf')
+import path from 'node:path'
+import { getCoverageReportDirectory } from '../envUtils.ts'
+import karmaBaseConf from './karma.base.conf.js'
 
 const coverageReports = ['text-summary', 'html']
 
@@ -8,7 +8,8 @@ if (process.env.CI) {
   coverageReports.push('clover')
 }
 
-module.exports = function (config) {
+// eslint-disable-next-line import/no-default-export
+export default function (config) {
   config.set({
     ...karmaBaseConf,
     reporters: ['coverage-istanbul', ...karmaBaseConf.reporters],
@@ -28,7 +29,7 @@ module.exports = function (config) {
       module: withIstanbulRule(karmaBaseConf.webpack.module),
     },
     sourceMapLoader: {
-      remapSource: (source) => source.replace(/webpack:\/\//g, path.join(__dirname, '../../')),
+      remapSource: (source) => source.replace(/webpack:\/\//g, path.join(import.meta.dirname, '../../')),
     },
   })
 }
diff --git a/test/unit/karmaDuplicateTestNameReporterPlugin.js b/test/unit/karmaDuplicateTestNameReporterPlugin.js
index 27f453c590..f66dd08d3c 100644
--- a/test/unit/karmaDuplicateTestNameReporterPlugin.js
+++ b/test/unit/karmaDuplicateTestNameReporterPlugin.js
@@ -36,6 +36,7 @@ function KarmaDuplicateTestNameReporter(logger) {
 
 KarmaDuplicateTestNameReporter.$inject = ['logger']
 
-module.exports = {
+// eslint-disable-next-line import/no-default-export
+export default {
   'reporter:karma-duplicate-test-name': ['type', KarmaDuplicateTestNameReporter],
 }
diff --git a/test/unit/karmaSkippedFailedReporterPlugin.js b/test/unit/karmaSkippedFailedReporterPlugin.js
index 3ee46237d2..215c235660 100644
--- a/test/unit/karmaSkippedFailedReporterPlugin.js
+++ b/test/unit/karmaSkippedFailedReporterPlugin.js
@@ -13,6 +13,7 @@ function KarmaSkippedFailedReporter(logger) {
 
 KarmaSkippedFailedReporter.$inject = ['logger']
 
-module.exports = {
+// eslint-disable-next-line import/no-default-export
+export default {
   'reporter:karma-skipped-failed': ['type', KarmaSkippedFailedReporter],
 }
diff --git a/tsconfig.default.json b/tsconfig.default.json
index f9fbe7a532..da5376ce76 100644
--- a/tsconfig.default.json
+++ b/tsconfig.default.json
@@ -14,8 +14,9 @@
     "packages/*/bundle",
 
     // Files included in ./tsconfig.scripts.json
-    "**/webpack.*.ts",
+    "**/webpack.*",
     "scripts",
+    "test/envUtils.ts",
 
     // Files included in ./test/e2e/tsconfig.json
     "test/e2e",
diff --git a/tsconfig.scripts.json b/tsconfig.scripts.json
index ee9e02c00f..248668d87c 100644
--- a/tsconfig.scripts.json
+++ b/tsconfig.scripts.json
@@ -15,5 +15,5 @@
     "checkJs": false,
     "allowImportingTsExtensions": true
   },
-  "include": ["scripts", "**/webpack.*.ts"]
+  "include": ["scripts", "**/webpack.*.mts", "test/envUtils.ts"]
 }
diff --git a/yarn.lock b/yarn.lock
index 402d37292d..af352e28c0 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -5329,6 +5329,12 @@ __metadata:
   languageName: node
   linkType: hard
 
+"e2e-079dc0@workspace:test/e2e":
+  version: 0.0.0-use.local
+  resolution: "e2e-079dc0@workspace:test/e2e"
+  languageName: unknown
+  linkType: soft
+
 "eastasianwidth@npm:^0.2.0":
   version: 0.2.0
   resolution: "eastasianwidth@npm:0.2.0"