diff --git a/packages/interpreter/build.rs b/packages/interpreter/build.rs
index 8066cec89..236467eaf 100644
--- a/packages/interpreter/build.rs
+++ b/packages/interpreter/build.rs
@@ -7,6 +7,7 @@ use std::{
 fn main() {
     // If any TS changes, re-run the build script
     println!("cargo:rerun-if-changed=src/ts/*.ts");
+    println!("cargo:rerun-if-changed=*.json");
 
     // Compute the hash of the ts files
     let hash = hash_dir("src/ts");
diff --git a/packages/interpreter/src/js/README.md b/packages/interpreter/src/js/README.md
new file mode 100644
index 000000000..851ef6751
--- /dev/null
+++ b/packages/interpreter/src/js/README.md
@@ -0,0 +1 @@
+this files are generated - do not edit them!
diff --git a/packages/interpreter/tsconfig.json b/packages/interpreter/tsconfig.json
index fe0cdc8ab..0207f8ca7 100644
--- a/packages/interpreter/tsconfig.json
+++ b/packages/interpreter/tsconfig.json
@@ -5,8 +5,7 @@
             "ES2015",
             "DOM",
             "dom",
-            "dom.iterable",
-            "esnext"
+            "dom.iterable"
         ],
         "noImplicitAny": true,
         "removeComments": true,