Run validation script without coverage

Code coverage is not relevant when validating annotations.
diff --git a/.mocharc.js b/.mocharc.js
index fbacce9..9ef86f5 100644
--- a/.mocharc.js
+++ b/.mocharc.js
@@ -20,6 +20,7 @@
 
 module.exports = {
   require: [
+    '@babel/register',
     'chai/register-assert',
   ],
 };
diff --git a/package.json b/package.json
index e0ff33f..a415d00 100644
--- a/package.json
+++ b/package.json
@@ -26,7 +26,7 @@
     "prepublishOnly": "yarn run build",
     "start": "webpack-dev-server --hot --mode development",
     "test": "cross-env BABEL_ENV=test nyc mocha packages/*/test/**/*.js",
-    "validate": "cross-env BABEL_ENV=test nyc mocha test/**/*.js"
+    "validate": "cross-env BABEL_ENV=test mocha -r esm test/**/*.js"
   },
   "husky": {
     "hooks": {