message: Suppress this undefined warning
diff: -import { RollupOptions } from 'rollup';
  +import { RollupOptions, RollupWarning } from 'rollup';
  import resolve from 'rollup-plugin-node-resolve';
  import commonjs from 'rollup-plugin-commonjs';
  import babel from 'rollup-plugin-babel';
  @@ -13,7 +13,6 @@ import page from './plugins/page';
  import removeSrc from './plugins/removeSrc';
  import rename from './plugins/rename';
  -
  const entries = getEntries();
  /**
  @@ -28,6 +27,10 @@ const config: RollupOptions = {
  },
  preserveModules: true,
  preserveSymlinks: true,
  + onwarn(warning, warn) {
  + if ((warning as RollupWarning).code === 'THIS_IS_UNDEFINED') return;
  + warn(warning); // this requires Rollup 0.46
  + },
  plugins: [
  commonjs({
  include: /node_modules/,
  