build: disallow JS, separate ES6 module build

package.json

@@ -95,7 +95,6 @@
     "rollup-plugin-uglify": "6.0.4",
     "standard-version": "8.0.2",
     "ts-jest": "26.1.3",
-    "tslib": "2.0.0",
     "typescript": "3.9.7"
   },
   "dependencies": {

rollup.config.js

@@ -42,6 +42,24 @@ export default [
         file: pkg.main,
         format: 'cjs',
       },
+    ],
+  },
+  {
+    input: 'src/index.ts',
+    external: Object.keys(pkg.dependencies),
+    plugins: [
+      typescript({
+        target: 'ES6',
+      }),
+      production &&
+        terser({
+          output: {
+            comments: false,
+          },
+        }),
+    ],
+    context: 'window',
+    output: [
       {
         exports: 'named',
         file: pkg.module,

tsconfig.json

@@ -1,17 +1,17 @@
 {
   "compilerOptions": {
     "target": "ES5",
-    "lib": ["DOM", "ESNext"],
     "module": "ESNext",
     "moduleResolution": "Node",
     "declaration": false,
     "strict": true,
     "esModuleInterop": true,
     "noEmitOnError": false,
-    "allowJs": true,
+    "allowJs": false,
     "checkJs": false,
     "skipLibCheck": false,
-    "incremental": false
+    "incremental": false,
+    "importHelpers": false
   },
   "include": ["./src"]
 }

yarn.lock

@@ -9072,11 +9072,6 @@ tsconfig-paths@^3.9.0:
     minimist "^1.2.0"
     strip-bom "^3.0.0"
 
-[email protected]:
-  version "2.0.0"
-  resolved "https://registry.yarnpkg.com/tslib/-/tslib-2.0.0.tgz#18d13fc2dce04051e20f074cc8387fd8089ce4f3"
-  integrity sha512-lTqkx847PI7xEDYJntxZH89L2/aXInsyF2luSafe/+0fHOMjlBNXdH6th7f70qxLDhul7KZK0zC8V5ZIyHl0/g==
-
 tslib@^1.8.1, tslib@^1.9.0:
   version "1.11.1"
   resolved "https://registry.yarnpkg.com/tslib/-/tslib-1.11.1.tgz#eb15d128827fbee2841549e171f45ed338ac7e35"