Merge pull request #30 from ef4/explicit-esm-runtime

Offer an explicit import path for esm vs cjs runtime

Author: ef4

Diff for: package.json

@@ -19,6 +19,8 @@
       "import": "./dist/runtime.js",
       "require": "./dist/runtime.cjs"
     },
+    "./runtime-esm": "./dist/runtime.js",
+    "./runtime-cjs": "./dist/runtime.cjs",
     "./globals": {
       "import": "./dist/globals.js",
       "require": "./dist/globals.cjs"