update structure, better support for es modules tailwind config

docs/example/tailwind.config.js

@@ -6,6 +6,6 @@ module.exports = {
         extend: {},
     },
     plugins: [
-        require('../../src/plugin.js')
+        require('../../src/plugin/index.cjs')
     ],
 }

jest/plugin.test.js

@@ -6,7 +6,7 @@ function run(config, plugin = tailwindcss) {
     const { currentTestName } = expect.getState()
 
     config = {
-        plugins: [require('../src/plugin.js')],
+        plugins: [require('../src/plugin/index.cjs')],
         corePlugins: { preflight: false },
         ...config,
     }

scripts/build.js

@@ -6,26 +6,12 @@ if (! fs.existsSync('./dist')) {
 }
 
 build({
-    entryPoints: ['src/observer.cdn.js'],
+    entryPoints: ['src/observer/cdn.js'],
     outfile: 'dist/observer.min.js',
     platform: 'browser',
     define: { CDN: 'true' },
 });
 
-build({
-    entryPoints: ['src/observer.js'],
-    outfile: 'dist/observer.esm.js',
-    platform: 'neutral',
-    mainFields: ['main', 'module'],
-});
-
-build({
-    entryPoints: ['src/plugin.js'],
-    outfile: 'dist/plugin.js',
-    target: ['node10.4'],
-    platform: 'node',
-});
-
 function build(options) {
     options.define || (options.define = {});
 

src/index.js

@@ -0,0 +1,5 @@
+import observer from './observer/index.js'
+import intersect from './plugin.js'
+
+export default observer
+export { intersect }

src/observer/cdn.js

@@ -0,0 +1,3 @@
+import Observer from './index.js'
+
+Observer.start()