test: fix watch console clearing

Author: jedwards1211

package.json

@@ -17,7 +17,7 @@
     "build:types": "tsc --emitDeclarationOnly",
     "build:js": "babel src --out-dir es --extensions \".ts\" --source-maps inline && cross-env BABEL_ENV=es5 babel src --out-dir . --extensions \".ts\"",
     "test": "cross-env NODE_ENV=test BABEL_ENV=es5 mocha $npm_package_config_mocha && cross-env NODE_ENV=test BABEL_ENV=coverage nyc --reporter=lcov --reporter=text mocha $npm_package_config_mocha",
-    "test:watch": "cross-env NODE_ENV=test BABEL_ENV=test mocha $npm_package_config_mocha --watch --watch-extensions ts",
+    "test:watch": "cross-env NODE_ENV=test BABEL_ENV=test mocha $npm_package_config_mocha --watch --watch-extensions js,ts",
     "test:debug": "cross-env NODE_ENV=test BABEL_ENV=test mocha --inspect-brk $npm_package_config_mocha",
     "codecov": "nyc report --reporter=text-lcov > coverage.lcov; codecov",
     "prepublishOnly": "npm run clean && npm run prettier:check && npm run lint && npm test && npm run build",