added "exports"-field markedjs#1692

Signed-off-by: kilian <kilian@catsoft.com>

package.json

@@ -14,6 +14,12 @@
     "man/",
     "marked.min.js"
   ],
+  "exports": {
+    ".": {
+      "import": "lib/marked.esm.js",
+      "require": "lib/marked.js"
+    }
+  },
   "repository": "git://github.com/markedjs/marked.git",
   "homepage": "https://marked.js.org",
   "bugs": {
@@ -34,6 +40,8 @@
     "@babel/core": "^7.9.6",
     "@babel/preset-env": "^7.9.6",
     "@markedjs/html-differ": "^3.0.2",
+    "@types/node": "^14.0.9",
+    "babel-eslint": "^10.1.0",
     "cheerio": "^1.0.0-rc.3",
     "commonmark": "0.29.x",
     "eslint": "^7.0.0",
@@ -51,6 +59,7 @@
     "rollup-plugin-babel": "^4.4.0",
     "rollup-plugin-commonjs": "^10.1.0",
     "rollup-plugin-license": "^2.0.1",
+    "standardx": "^5.0.0",
     "uglify-js": "^3.9.3",
     "vuln-regex-detector": "^1.3.0"
   },