diff --git a/.gitignore b/.gitignore
index f222b0b5..87b58ca7 100644
--- a/.gitignore
+++ b/.gitignore
@@ -35,4 +35,5 @@ report.*.json
 # rust output
 target/
 # wasm-pack output
-pkg/
+pkg/*
+!pkg/package.json
diff --git a/package.json b/package.json
index 3238b1e9..1085ec58 100644
--- a/package.json
+++ b/package.json
@@ -11,9 +11,11 @@
         "lodash": "^4.17.15",
         "luxon": "^1.23.0",
         "monaco-editor": "^0.20.0",
-        "prs-rs": "file:src/core/data_formats/compression/prs/pkg",
         "three": "^0.115.0"
     },
+    "optionalDependencies": {
+        "prs-rs": "file:src/core/data_formats/compression/prs/pkg"
+    },
     "scripts": {
         "start": "webpack-dev-server --config webpack.dev.js",
         "build_prs_rs": "wasm-pack build src/core/data_formats/compression/prs",
diff --git a/src/core/data_formats/compression/prs/pkg/package.json b/src/core/data_formats/compression/prs/pkg/package.json
new file mode 100644
index 00000000..6487eb03
--- /dev/null
+++ b/src/core/data_formats/compression/prs/pkg/package.json
@@ -0,0 +1,4 @@
+{
+    "name": "prs-rs",
+    "version": "0.1.0"
+}