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rollup.config.js
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rollup.config.js
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/* globals process */
import svelte from 'rollup-plugin-svelte';
import resolve from 'rollup-plugin-node-resolve';
import commonjs from 'rollup-plugin-commonjs';
import babel from 'rollup-plugin-babel';
import livereload from 'rollup-plugin-livereload';
import { terser } from 'rollup-plugin-terser';
const production = !process.env.ROLLUP_WATCH;
export default {
input: 'src/index.js',
output: {
sourcemap: true,
format: 'esm',
file: 'dist/bundle.js'
},
plugins: [
svelte({
// enable run-time checks when not in production
dev: !production,
// we'll extract any component CSS out into
// a separate file — better for performance
css: css => {
css.write('dist/bundle.css');
}
}),
babel({
extensions: ['.js', '.mjs', '.html', '.svelte'],
runtimeHelpers: true,
exclude: ['node_modules/@babel/**', 'node_modules/core-js-pure/**'],
presets: [['@babel/preset-env', {
targets: '> 0.25%, not dead'
}]],
plugins: [['@babel/plugin-transform-runtime', {
useESModules: true,
corejs: 3,
proposals: true
}]]
}),
// If you have external dependencies installed from
// npm, you'll most likely need these plugins. In
// some cases you'll need additional configuration —
// consult the documentation for details:
// https://github.com/rollup/rollup-plugin-commonjs
resolve(),
commonjs(),
// Watch the `dist` directory and refresh the
// browser on changes when not in production
!production && livereload('dist'),
// If we're building for production (npm run build
// instead of npm run dev), minify
production && terser()
],
watch: {
clearScreen: false
}
};