Add rollup configs

Author: zerodevx

rollup.config.js

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+import svelte from 'rollup-plugin-svelte'
+import resolve from '@rollup/plugin-node-resolve'
+import commonjs from '@rollup/plugin-commonjs'
+import livereload from 'rollup-plugin-livereload'
+import { terser } from 'rollup-plugin-terser'
+
+const production = !process.env.ROLLUP_WATCH
+
+function serve () {
+  let server
+  function toExit () {
+    if (server) server.kill(0)
+  }
+  return {
+    writeBundle () {
+      if (server) return
+      server = require('child_process').spawn('npm', ['run', 'start', '--', '--dev'], {
+        stdio: ['ignore', 'inherit', 'inherit'],
+        shell: true
+      })
+      process.on('SIGTERM', toExit)
+      process.on('exit', toExit)
+    }
+  }
+}
+
+export default {
+  input: 'docs/main.js',
+  output: {
+    sourcemap: true,
+    format: 'iife',
+    name: 'app',
+    file: 'docs/build/bundle.js'
+  },
+  plugins: [
+    svelte({
+      dev: !production,
+      css: true
+    }),
+    resolve(),
+    commonjs(),
+    !production && serve(),
+    !production && livereload('docs'),
+    production && terser()
+  ],
+  watch: {
+    clearScreen: false
+  }
+}

rollup.dist.config.js

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+import svelte from 'rollup-plugin-svelte'
+import resolve from '@rollup/plugin-node-resolve'
+import commonjs from '@rollup/plugin-commonjs'
+import { terser } from 'rollup-plugin-terser'
+import pkg from './package.json'
+
+export default {
+  input: 'src/index.js',
+  output: [
+    { file: pkg.module, format: 'es' },
+    { file: pkg.main, format: 'umd', name: 'SvelteToast' }
+  ],
+  plugins: [
+    svelte(),
+    resolve(),
+    commonjs(),
+    terser()
+  ]
+}