first version

rollup.config.js

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+import * as path from 'path';
+import { terser } from "rollup-plugin-terser";
+import typescript from 'rollup-plugin-typescript2';
+import serve from 'rollup-plugin-serve';
+
+const devMode = process.env.NODE_ENV === 'development';
+const shouldServe = !!process.env.SERVE;
+const filename = 'text-frame' + (devMode ? '' : '-min') + '.js';
+const plugins = [
+  typescript({
+    clean: true,
+    tsconfig: './tsconfig.json'
+  }),
+  !devMode && terser(),
+  shouldServe && serve({
+    open: true,
+    contentBase: './',
+    openPage: '/example/index.html',
+    port: 5000
+  })
+].filter(Boolean);
+
+export default {
+  input: 'src/text-frame.ts',
+  output: [
+    {
+      file: path.resolve('dist', 'esm', filename),
+      format: 'esm',
+      sourcemap: devMode
+    },
+    {
+      file: path.resolve('dist', 'umd', filename),
+      format: 'umd',
+      name: 'TextFrame',
+      sourcemap: devMode
+    }
+  ],
+  plugins: plugins,
+  watch: {
+    include: ['src/**/*', 'example/*']
+  }
+}