feat(build): use rollup based buildsystem

.babelrc.js

@@ -0,0 +1,24 @@
+const { NODE_ENV } = process.env
+
+const defaultPlugins = [['ramda', { useES: NODE_ENV === 'es' }]]
+
+module.exports = {
+  presets: [
+    [
+      '@babel/env',
+      {
+        corejs: 3,
+        loose: true,
+        modules: NODE_ENV === 'test' ? 'auto' : false,
+        targets: { node: 8 },
+        useBuiltIns: 'usage',
+      },
+    ],
+  ],
+  plugins: ['es', 'cjs', 'test'].includes(NODE_ENV)
+    ? [
+        ...defaultPlugins,
+        ['@babel/transform-runtime', { useESModules: NODE_ENV === 'es' }],
+      ]
+    : defaultPlugins,
+}

.gitignore

@@ -26,11 +26,9 @@ package.lock
 .env.*
 
 # Build generated.
-build/
 coverage/
-dist/
-es/
 lib/
+tmp/
 
 # SublimeText.
 *.stTheme.cache

jsconfig.json

@@ -1,8 +1,7 @@
 {
   "compilerOptions": {
-    "target": "es2017",
-    "checkJs": true,
-    "allowSyntheticDefaultImports": true
+    "allowSyntheticDefaultImports": true,
+    "target": "es2017"
   },
   "include": ["src/**/*", "test/**/*"]
 }