diff --git a/implementations/javascript/.npmignore b/implementations/javascript/.npmignore
new file mode 100644
index 0000000..e69de29
diff --git a/implementations/javascript/package.json b/implementations/javascript/package.json
index f2b8806..d947e1a 100644
--- a/implementations/javascript/package.json
+++ b/implementations/javascript/package.json
@@ -8,8 +8,8 @@
     "access": "public"
   },
   "repository": "gitlab:preserves/preserves",
-  "type": "module",
-  "main": "lib/index.js",
+  "main": "dist/preserves.js",
+  "module": "lib/index.js",
   "types": "lib/index.d.ts",
   "author": "Tony Garnock-Jones <tonyg@leastfixedpoint.com>",
   "devDependencies": {
diff --git a/implementations/javascript/rollup.config.js b/implementations/javascript/rollup.config.js
index 51395d1..ea85fdd 100644
--- a/implementations/javascript/rollup.config.js
+++ b/implementations/javascript/rollup.config.js
@@ -2,7 +2,7 @@ import pkg from './package.json';
 import { terser } from 'rollup-plugin-terser';
 
 function distfile(insertion) {
-  const f = `${pkg.name}-${pkg.version}${insertion}.js`;
+  const f = `${pkg.name}${insertion}.js`;
   return `dist/${f}`;
 }