diff --git a/packages/browser-logs/package.json b/packages/browser-logs/package.json
index ca0f4cef0..277d13cf2 100644
--- a/packages/browser-logs/package.json
+++ b/packages/browser-logs/package.json
@@ -52,5 +52,10 @@
   "devDependencies": {
     "@esm-bundle/chai": "^4.1.5",
     "puppeteer": "^21.5.0"
+  },
+  "mocha": {
+    "loader": "ts-node/esm",
+    "exit": true,
+    "retries": 3
   }
 }
diff --git a/packages/config-loader/package.json b/packages/config-loader/package.json
index 244922f5b..afbe08b71 100644
--- a/packages/config-loader/package.json
+++ b/packages/config-loader/package.json
@@ -46,5 +46,10 @@
       "import": "./index.mjs",
       "require": "./src/index.js"
     }
+  },
+  "mocha": {
+    "loader": "ts-node/esm",
+    "exit": true,
+    "retries": 3
   }
 }
diff --git a/packages/dev-server-core/package.json b/packages/dev-server-core/package.json
index 8b6dd4d32..4f11492b9 100644
--- a/packages/dev-server-core/package.json
+++ b/packages/dev-server-core/package.json
@@ -88,5 +88,10 @@
     "express": "^4.18.2",
     "nanoid": "^3.1.25",
     "portfinder": "^1.0.32"
+  },
+  "mocha": {
+    "loader": "ts-node/esm",
+    "exit": true,
+    "retries": 3
   }
 }
diff --git a/packages/dev-server-esbuild/package.json b/packages/dev-server-esbuild/package.json
index 26a368585..b7a63579e 100644
--- a/packages/dev-server-esbuild/package.json
+++ b/packages/dev-server-esbuild/package.json
@@ -63,5 +63,10 @@
     "@web/dev-server-rollup": "^0.6.1",
     "lit-element": "^3.0.0 || ^4.0.1",
     "preact": "^10.5.9"
+  },
+  "mocha": {
+    "loader": "ts-node/esm",
+    "exit": true,
+    "retries": 3
   }
 }
diff --git a/packages/dev-server-hmr/package.json b/packages/dev-server-hmr/package.json
index d7ccc1bbf..fa603063e 100644
--- a/packages/dev-server-hmr/package.json
+++ b/packages/dev-server-hmr/package.json
@@ -46,5 +46,10 @@
   "devDependencies": {
     "lit-html": "^2.7.3 || ^3.0.0",
     "puppeteer": "^20.0.0"
+  },
+  "mocha": {
+    "loader": "ts-node/esm",
+    "exit": true,
+    "retries": 3
   }
 }
diff --git a/packages/dev-server-import-maps/package.json b/packages/dev-server-import-maps/package.json
index 2f6e3d2f9..e8b99380c 100644
--- a/packages/dev-server-import-maps/package.json
+++ b/packages/dev-server-import-maps/package.json
@@ -60,5 +60,10 @@
   },
   "devDependencies": {
     "@web/test-runner": "^0.18.0"
+  },
+  "mocha": {
+    "loader": "ts-node/esm",
+    "exit": true,
+    "retries": 3
   }
 }
diff --git a/packages/dev-server-legacy/package.json b/packages/dev-server-legacy/package.json
index 0ed54d057..7fa5d8be5 100644
--- a/packages/dev-server-legacy/package.json
+++ b/packages/dev-server-legacy/package.json
@@ -73,5 +73,10 @@
     "@types/browserslist-useragent": "^3.0.2",
     "@types/caniuse-api": "^3.0.1",
     "@types/valid-url": "^1.0.3"
+  },
+  "mocha": {
+    "loader": "ts-node/esm",
+    "exit": true,
+    "retries": 3
   }
 }
diff --git a/packages/dev-server-polyfill/package.json b/packages/dev-server-polyfill/package.json
index 77cd2a624..3ed283b90 100644
--- a/packages/dev-server-polyfill/package.json
+++ b/packages/dev-server-polyfill/package.json
@@ -40,5 +40,10 @@
   "dependencies": {
     "@web/dev-server": "^0.4.0",
     "@web/polyfills-loader": "^2.2.0"
+  },
+  "mocha": {
+    "loader": "ts-node/esm",
+    "exit": true,
+    "retries": 3
   }
 }
diff --git a/packages/dev-server-rollup/package.json b/packages/dev-server-rollup/package.json
index 4ec3268fd..e673a737f 100644
--- a/packages/dev-server-rollup/package.json
+++ b/packages/dev-server-rollup/package.json
@@ -70,5 +70,10 @@
     "mocha": "^10.2.0",
     "postcss": "^8.4.31",
     "rollup-plugin-postcss": "^4.0.2"
+  },
+  "mocha": {
+    "loader": "ts-node/esm",
+    "exit": true,
+    "retries": 3
   }
 }
diff --git a/packages/dev-server-storybook/package.json b/packages/dev-server-storybook/package.json
index 4280f768c..535835d0f 100644
--- a/packages/dev-server-storybook/package.json
+++ b/packages/dev-server-storybook/package.json
@@ -77,5 +77,10 @@
     "@types/path-is-inside": "^1.0.0",
     "@web/dev-server": "^0.4.0",
     "htm": "^3.1.0"
+  },
+  "mocha": {
+    "loader": "ts-node/esm",
+    "exit": true,
+    "retries": 3
   }
 }
diff --git a/packages/dev-server/package.json b/packages/dev-server/package.json
index 7d8165f27..ef983b0fa 100644
--- a/packages/dev-server/package.json
+++ b/packages/dev-server/package.json
@@ -75,5 +75,10 @@
     "@types/command-line-usage": "^5.0.1",
     "lit-html": "^2.7.3 || ^3.0.0",
     "puppeteer": "^20.0.0"
+  },
+  "mocha": {
+    "loader": "ts-node/esm",
+    "exit": true,
+    "retries": 3
   }
 }
diff --git a/packages/mocks/package.json b/packages/mocks/package.json
index f32b6cd4b..3b27d8178 100644
--- a/packages/mocks/package.json
+++ b/packages/mocks/package.json
@@ -85,5 +85,10 @@
       ],
       "dependencies": []
     }
+  },
+  "mocha": {
+    "loader": "ts-node/esm",
+    "exit": true,
+    "retries": 3
   }
 }
diff --git a/packages/parse5-utils/package.json b/packages/parse5-utils/package.json
index 39c2cb0c2..2d79a9649 100644
--- a/packages/parse5-utils/package.json
+++ b/packages/parse5-utils/package.json
@@ -48,5 +48,10 @@
   },
   "devDependencies": {
     "@types/html-minifier-terser": "^7.0.0"
+  },
+  "mocha": {
+    "loader": "ts-node/esm",
+    "exit": true,
+    "retries": 3
   }
 }
diff --git a/packages/polyfills-loader/package.json b/packages/polyfills-loader/package.json
index 5445526fe..123f76c7f 100644
--- a/packages/polyfills-loader/package.json
+++ b/packages/polyfills-loader/package.json
@@ -71,5 +71,10 @@
     "@types/babel__core": "^7.1.12",
     "@types/parse5": "^6.0.1",
     "@types/valid-url": "^1.0.3"
+  },
+  "mocha": {
+    "loader": "ts-node/esm",
+    "exit": true,
+    "retries": 3
   }
 }
diff --git a/packages/rollup-plugin-copy/package.json b/packages/rollup-plugin-copy/package.json
index 699fdda8d..0938b5873 100644
--- a/packages/rollup-plugin-copy/package.json
+++ b/packages/rollup-plugin-copy/package.json
@@ -51,5 +51,10 @@
   "devDependencies": {
     "@types/glob": "^8.1.0"
   },
-  "types": "dist/copy.d.ts"
+  "types": "dist/copy.d.ts",
+  "mocha": {
+    "loader": "ts-node/esm",
+    "exit": true,
+    "retries": 3
+  }
 }
diff --git a/packages/rollup-plugin-html/package.json b/packages/rollup-plugin-html/package.json
index 421de6389..4737c7597 100644
--- a/packages/rollup-plugin-html/package.json
+++ b/packages/rollup-plugin-html/package.json
@@ -53,5 +53,10 @@
   "devDependencies": {
     "@types/html-minifier-terser": "^7.0.0",
     "rollup": "^4.4.0"
+  },
+  "mocha": {
+    "loader": "ts-node/esm",
+    "exit": true,
+    "retries": 3
   }
 }
diff --git a/packages/rollup-plugin-import-meta-assets/package.json b/packages/rollup-plugin-import-meta-assets/package.json
index 58fc20a5b..85c27c960 100644
--- a/packages/rollup-plugin-import-meta-assets/package.json
+++ b/packages/rollup-plugin-import-meta-assets/package.json
@@ -48,5 +48,10 @@
     "globby": "^13.2.2",
     "magic-string": "^0.30.0"
   },
-  "types": "dist/index"
+  "types": "dist/index",
+  "mocha": {
+    "loader": "ts-node/esm",
+    "exit": true,
+    "retries": 3
+  }
 }
diff --git a/packages/rollup-plugin-polyfills-loader/package.json b/packages/rollup-plugin-polyfills-loader/package.json
index 1a823e2a9..1a23d4fe7 100644
--- a/packages/rollup-plugin-polyfills-loader/package.json
+++ b/packages/rollup-plugin-polyfills-loader/package.json
@@ -51,5 +51,10 @@
   "devDependencies": {
     "@web/rollup-plugin-html": "^2.1.2",
     "rollup": "^4.4.0"
+  },
+  "mocha": {
+    "loader": "ts-node/esm",
+    "exit": true,
+    "retries": 3
   }
 }
diff --git a/packages/rollup-plugin-workbox/package.json b/packages/rollup-plugin-workbox/package.json
index 11d3c71ec..e6b2ce175 100644
--- a/packages/rollup-plugin-workbox/package.json
+++ b/packages/rollup-plugin-workbox/package.json
@@ -40,5 +40,10 @@
   "contributors": [
     "Pascal Schilp <pascalschilp@gmail.com>",
     "Benny Powers <web@bennypowers.com>"
-  ]
+  ],
+  "mocha": {
+    "loader": "ts-node/esm",
+    "exit": true,
+    "retries": 3
+  }
 }
diff --git a/packages/storybook-builder/package.json b/packages/storybook-builder/package.json
index 1cec50039..2530e9486 100644
--- a/packages/storybook-builder/package.json
+++ b/packages/storybook-builder/package.json
@@ -83,5 +83,10 @@
     "prettier": "^2.4.1",
     "prettier-plugin-package": "^1.3.0",
     "typescript": "~5.0.4"
+  },
+  "mocha": {
+    "loader": "ts-node/esm",
+    "exit": true,
+    "retries": 3
   }
 }
diff --git a/packages/storybook-framework-web-components/package.json b/packages/storybook-framework-web-components/package.json
index 15d084bd4..eb030d7c4 100644
--- a/packages/storybook-framework-web-components/package.json
+++ b/packages/storybook-framework-web-components/package.json
@@ -70,5 +70,10 @@
     "prettier": "^2.4.1",
     "prettier-plugin-package": "^1.3.0",
     "typescript": "~5.0.4"
+  },
+  "mocha": {
+    "loader": "ts-node/esm",
+    "exit": true,
+    "retries": 3
   }
 }
diff --git a/packages/storybook-utils/package.json b/packages/storybook-utils/package.json
index dc09972c2..793ad6714 100644
--- a/packages/storybook-utils/package.json
+++ b/packages/storybook-utils/package.json
@@ -47,5 +47,10 @@
   },
   "devDependencies": {
     "react": "^18.0.0"
+  },
+  "mocha": {
+    "loader": "ts-node/esm",
+    "exit": true,
+    "retries": 3
   }
 }
diff --git a/packages/test-runner-browserstack/package.json b/packages/test-runner-browserstack/package.json
index ca0ab6767..23f9771fb 100644
--- a/packages/test-runner-browserstack/package.json
+++ b/packages/test-runner-browserstack/package.json
@@ -56,5 +56,10 @@
     "@types/ip": "^1.1.0",
     "@web/dev-server-legacy": "^2.1.0",
     "portfinder": "^1.0.32"
+  },
+  "mocha": {
+    "loader": "ts-node/esm",
+    "exit": true,
+    "retries": 3
   }
 }
diff --git a/packages/test-runner-chrome/package.json b/packages/test-runner-chrome/package.json
index a8603fa29..575d1f356 100644
--- a/packages/test-runner-chrome/package.json
+++ b/packages/test-runner-chrome/package.json
@@ -56,5 +56,10 @@
   "devDependencies": {
     "@types/istanbul-reports": "^3.0.0",
     "@web/test-runner-mocha": "^0.9.0"
+  },
+  "mocha": {
+    "loader": "ts-node/esm",
+    "exit": true,
+    "retries": 3
   }
 }
diff --git a/packages/test-runner-cli/package.json b/packages/test-runner-cli/package.json
index 5a8637f0e..ae8a4ec7c 100644
--- a/packages/test-runner-cli/package.json
+++ b/packages/test-runner-cli/package.json
@@ -44,5 +44,10 @@
     "terminal",
     "console",
     "CLI"
-  ]
+  ],
+  "mocha": {
+    "loader": "ts-node/esm",
+    "exit": true,
+    "retries": 3
+  }
 }
diff --git a/packages/test-runner-commands/package.json b/packages/test-runner-commands/package.json
index 19d292e0f..5e499d462 100644
--- a/packages/test-runner-commands/package.json
+++ b/packages/test-runner-commands/package.json
@@ -58,5 +58,10 @@
     "@web/test-runner-playwright": "^0.11.0",
     "@web/test-runner-webdriver": "^0.8.0",
     "mocha": "^10.2.0"
+  },
+  "mocha": {
+    "loader": "ts-node/esm",
+    "exit": true,
+    "retries": 3
   }
 }
diff --git a/packages/test-runner-core/package.json b/packages/test-runner-core/package.json
index c8a1fc658..33b46b1e2 100644
--- a/packages/test-runner-core/package.json
+++ b/packages/test-runner-core/package.json
@@ -82,5 +82,10 @@
   },
   "devDependencies": {
     "portfinder": "^1.0.32"
+  },
+  "mocha": {
+    "loader": "ts-node/esm",
+    "exit": true,
+    "retries": 3
   }
 }
diff --git a/packages/test-runner-coverage-v8/package.json b/packages/test-runner-coverage-v8/package.json
index 0352ba7cc..eb756c835 100644
--- a/packages/test-runner-coverage-v8/package.json
+++ b/packages/test-runner-coverage-v8/package.json
@@ -53,5 +53,10 @@
   "devDependencies": {
     "@types/istanbul-lib-coverage": "^2.0.3",
     "@types/picomatch": "^2.2.1"
+  },
+  "mocha": {
+    "loader": "ts-node/esm",
+    "exit": true,
+    "retries": 3
   }
 }
diff --git a/packages/test-runner-junit-reporter/package.json b/packages/test-runner-junit-reporter/package.json
index a7a24d46e..de65fc362 100644
--- a/packages/test-runner-junit-reporter/package.json
+++ b/packages/test-runner-junit-reporter/package.json
@@ -54,5 +54,10 @@
   "devDependencies": {
     "@types/xml": "^1.0.11",
     "@web/test-runner-playwright": "^0.11.0"
+  },
+  "mocha": {
+    "loader": "ts-node/esm",
+    "exit": true,
+    "retries": 3
   }
 }
diff --git a/packages/test-runner-mocha/package.json b/packages/test-runner-mocha/package.json
index d50a873c5..3fea3fef5 100644
--- a/packages/test-runner-mocha/package.json
+++ b/packages/test-runner-mocha/package.json
@@ -42,5 +42,10 @@
     "@types/mocha": "^10.0.1",
     "deepmerge": "^4.2.2",
     "mocha": "^10.2.0"
+  },
+  "mocha": {
+    "loader": "ts-node/esm",
+    "exit": true,
+    "retries": 3
   }
 }
diff --git a/packages/test-runner-module-mocking/package.json b/packages/test-runner-module-mocking/package.json
index ada4d4e0b..aecbc4486 100644
--- a/packages/test-runner-module-mocking/package.json
+++ b/packages/test-runner-module-mocking/package.json
@@ -54,5 +54,10 @@
   "devDependencies": {
     "@web/test-runner-chrome": "^0.15.0",
     "@web/test-runner-core": "^0.13.0"
+  },
+  "mocha": {
+    "loader": "ts-node/esm",
+    "exit": true,
+    "retries": 3
   }
 }
diff --git a/packages/test-runner-playwright/package.json b/packages/test-runner-playwright/package.json
index 82b13683b..e9262d410 100644
--- a/packages/test-runner-playwright/package.json
+++ b/packages/test-runner-playwright/package.json
@@ -54,5 +54,10 @@
   "devDependencies": {
     "@web/test-runner-mocha": "^0.9.0",
     "portfinder": "^1.0.32"
+  },
+  "mocha": {
+    "loader": "ts-node/esm",
+    "exit": true,
+    "retries": 3
   }
 }
diff --git a/packages/test-runner-puppeteer/package.json b/packages/test-runner-puppeteer/package.json
index 35a1be9cc..e6931fa2c 100644
--- a/packages/test-runner-puppeteer/package.json
+++ b/packages/test-runner-puppeteer/package.json
@@ -54,5 +54,10 @@
   "devDependencies": {
     "@web/test-runner-mocha": "^0.9.0",
     "puppeteer-core": "^20.0.0"
+  },
+  "mocha": {
+    "loader": "ts-node/esm",
+    "exit": true,
+    "retries": 3
   }
 }
diff --git a/packages/test-runner-saucelabs/package.json b/packages/test-runner-saucelabs/package.json
index 91319cd39..b132ba9bb 100644
--- a/packages/test-runner-saucelabs/package.json
+++ b/packages/test-runner-saucelabs/package.json
@@ -59,5 +59,10 @@
     "@web/dev-server-esbuild": "^1.0.0",
     "@web/dev-server-legacy": "^2.1.0",
     "portfinder": "^1.0.32"
+  },
+  "mocha": {
+    "loader": "ts-node/esm",
+    "exit": true,
+    "retries": 3
   }
 }
diff --git a/packages/test-runner-selenium/package.json b/packages/test-runner-selenium/package.json
index 20c0e6f27..07eb72108 100644
--- a/packages/test-runner-selenium/package.json
+++ b/packages/test-runner-selenium/package.json
@@ -55,5 +55,10 @@
     "@types/selenium-standalone": "^7.0.1",
     "@types/selenium-webdriver": "^4.0.11",
     "selenium-standalone": "^8.0.4"
+  },
+  "mocha": {
+    "loader": "ts-node/esm",
+    "exit": true,
+    "retries": 3
   }
 }
diff --git a/packages/test-runner-visual-regression/package.json b/packages/test-runner-visual-regression/package.json
index c6e0398b4..9362fd5fe 100644
--- a/packages/test-runner-visual-regression/package.json
+++ b/packages/test-runner-visual-regression/package.json
@@ -64,5 +64,10 @@
     "@web/test-runner-playwright": "^0.11.0",
     "@web/test-runner-webdriver": "^0.8.0",
     "mocha": "^10.2.0"
+  },
+  "mocha": {
+    "loader": "ts-node/esm",
+    "exit": true,
+    "retries": 3
   }
 }
diff --git a/packages/test-runner-webdriver/package.json b/packages/test-runner-webdriver/package.json
index 10c180966..20051e372 100644
--- a/packages/test-runner-webdriver/package.json
+++ b/packages/test-runner-webdriver/package.json
@@ -55,5 +55,10 @@
   "devDependencies": {
     "@types/selenium-standalone": "^7.0.1",
     "selenium-standalone": "^8.0.4"
+  },
+  "mocha": {
+    "loader": "ts-node/esm",
+    "exit": true,
+    "retries": 3
   }
 }
diff --git a/packages/test-runner/package.json b/packages/test-runner/package.json
index 846d7139c..cb790e956 100644
--- a/packages/test-runner/package.json
+++ b/packages/test-runner/package.json
@@ -102,5 +102,10 @@
     "@web/test-runner-saucelabs": "^0.11.0",
     "babel-plugin-istanbul": "^6.0.0",
     "concurrently": "^8.0.1"
+  },
+  "mocha": {
+    "loader": "ts-node/esm",
+    "exit": true,
+    "retries": 3
   }
 }