diff --git a/package.json b/package.json
index 4428b0b5c..a82008d76 100644
--- a/package.json
+++ b/package.json
@@ -50,7 +50,7 @@
     "test": "gulp test",
     "test:browser": "cd tests/browser && npx mocha",
     "test:generators": "gulp testGenerators",
-    "test:mocha:interactive": "http-server ./ -o /tests/mocha/index.html -c-1",
+    "test:mocha:interactive": "npm run build && concurrently -n tsc,server \"tsc --watch --preserveWatchOutput --outDir \"build/src\" --declarationDir \"build/declarations\"\" \"http-server ./ -o /tests/mocha/index.html -c-1\"",
     "test:compile:advanced": "gulp buildAdvancedCompilationTest --debug",
     "updateGithubPages": "npm ci && gulp gitUpdateGithubPages"
   },