change babel config to export ESM

Author: PaulieScanlon

packages/mdx-embed/.babelrc

@@ -1,13 +1,13 @@
 {
-  "presets": ["@babel/preset-env", "@babel/preset-react", "@babel/preset-typescript"],
-  "plugins": [
+  "presets": [
     [
-      "@babel/plugin-transform-modules-commonjs",
+      "@babel/preset-env",
       {
-        "strictMode": false
+        "modules": false
       }
     ],
-    "@babel/plugin-proposal-class-properties",
-    "@babel/plugin-proposal-object-rest-spread"
-  ]
+    "@babel/preset-react",
+    "@babel/preset-typescript"
+  ],
+  "plugins": ["@babel/plugin-proposal-class-properties", "@babel/plugin-proposal-object-rest-spread"]
 }

packages/mdx-embed/package.json

@@ -10,7 +10,6 @@
     "build:types": "tsc",
     "build:js": "babel -d dist src --extensions=\".ts,.tsx\"",
     "build": "npm run build:types && npm run build:js",
-    "develop": "babel -d dist src --extensions=\".ts,.tsx\" -w",
     "test": "jest",
     "test:watch": "jest --watch",
     "test:coverage": "jest --coverage"
@@ -44,7 +43,6 @@
     "@babel/core": "^7.11.4",
     "@babel/plugin-proposal-class-properties": "^7.10.4",
     "@babel/plugin-proposal-object-rest-spread": "^7.11.0",
-    "@babel/plugin-transform-modules-commonjs": "^7.10.4",
     "@babel/preset-env": "^7.11.5",
     "@babel/preset-react": "^7.10.4",
     "@babel/preset-typescript": "^7.10.4",

packages/mdx-embed/tsconfig.json

@@ -11,7 +11,7 @@
     // Set declartion to true
     "declaration": true,
     // Determine where the d.ts files are put
-    "declarationDir": "./dist/types",
+    "declarationDir": "./dist/",
     // Redirect to declarationDir
     "outDir": "./dist/",
     // Enable strictest settings like strictNullChecks & noImplicitAny.