Trying to build correctly

Author: krainboltgreene

.babelrc

@@ -1,15 +1,24 @@
 {
+  "sourceMaps": true,
   "presets": [
     "@babel/preset-typescript",
-    "@babel/env",
     "minify"
   ],
   "plugins": [
     ["module-resolver", {"alias": {"^@types/(.+)$": "./types/\\1"}}],
-    "@babel/plugin-syntax-dynamic-import",
     "@babel/plugin-proposal-object-rest-spread"
   ],
   "env": {
+    "main": {
+      "presets": [
+        ["@babel/preset-env", {"targets": {"node": 10}, "useBuiltIns": "usage", "corejs": 3}],
+      ]
+    },
+    "browser": {
+      "presets": [
+        ["@babel/preset-env", {"useBuiltIns": "usage", "corejs": 3}],
+      ]
+    },
     "test": {
       "plugins": [
         "istanbul",

package.json

@@ -29,8 +29,8 @@
     "prepublishOnly": "npm run build",
     "test": "NODE_ENV=test tap --100 './test.js'",
     "build": "npm run build:browser && npm run build:main",
-    "build:main": "babel --source-type module --source-maps true --out-file './main.js' './index.js'",
-    "build:browser": "babel --source-type module --source-maps true --out-file './browser.js' './index.js'",
+    "build:main": "babel --env-name main --out-file './main.js' './index.js'",
+    "build:browser": "babel --env-name browser --out-file './browser.js' './index.js'",
     "lint": "eslint './index.js'",
     "ci": "npm run test"
   },