Revert "add microbundle (vercel#487)" (vercel#492)

This reverts commit 415ab93.

.eslintignore

@@ -1,2 +1,3 @@
 dist/**/*
+esm/**/*
 node_modules

.gitignore

@@ -1,5 +1,6 @@
 node_modules
 dist
+esm
 *.log
 *.tgz
 .env

package.json

@@ -2,22 +2,22 @@
   "name": "swr",
   "version": "0.2.3",
   "description": "React Hooks library for remote data fetching",
-  "source": "src/index.ts",
-  "main": "dist/index.js",
-  "module": "dist/index.module.js",
-  "umd:main": "dist/index.umd.js",
-  "unpkg": "dist/index.umd.js",
-  "react-native": "dist/index.module.js",
-  "types": "dist/index.d.ts",
+  "main": "./dist/index.js",
+  "module": "./esm/index.js",
+  "react-native": "./esm/index.js",
+  "types": "./dist/index.d.ts",
   "files": [
-    "dist/**"
+    "dist/**",
+    "esm/**"
   ],
   "repository": "vercel/swr",
   "homepage": "https://swr.now.sh",
   "license": "MIT",
   "scripts": {
     "dev": "vercel dev",
-    "build": "microbundle",
+    "build": "npm run build:esm && npm run build:cjs",
+    "build:cjs": "ncc build src/index.ts -o dist -m -e react",
+    "build:esm": "tsc --module ES6 --outDir esm",
     "watch": "tsc --watch",
     "types:check": "tsc --noEmit",
     "format": "prettier --write \"{src,test,examples}/**/*.{ts,tsx}\"",
@@ -44,12 +44,12 @@
     "@types/react": "16.9.11",
     "@typescript-eslint/eslint-plugin": "2.5.0",
     "@typescript-eslint/parser": "2.5.0",
+    "@zeit/ncc": "0.20.5",
     "eslint": "6.6.0",
     "eslint-config-prettier": "6.5.0",
     "husky": "2.4.1",
     "jest": "24.9.0",
     "lint-staged": "8.2.1",
-    "microbundle": "0.12.2",
     "prettier": "1.18.2",
     "react": "16.11.0",
     "react-dom": "16.11.0",

tsconfig.json

@@ -6,7 +6,7 @@
     "lib": [
       "esnext", "dom"
     ],
-    "module": "esnext",
+    "module": "commonjs",
     "moduleResolution": "node",
     "noEmitOnError": true,
     "noFallthroughCasesInSwitch": true,