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rollup.config.js
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rollup.config.js
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import svelte from 'rollup-plugin-svelte-hot';
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';
import hmr from 'rollup-plugin-hot';
// Set this to true to pass the --single flag to sirv (this serves your
// index.html for any unmatched route, which is a requirement for SPA
// routers using History API / pushState)
//
// NOTE This will have no effect when running with Nollup. For Nollup, you'd
// have to add the --history-api-fallback yourself in your package.json
// scripts (see: https://github.com/PepsRyuu/nollup/#nollup-options)
//
// eslint-disable-next-line no-unused-vars
const spa = false;
// NOTE The NOLLUP env variable is picked by various HMR plugins to switch
// in compat mode. You should not change its name (and set the env variable
// yourself if you launch nollup with custom comands).
const isNollup = !!process.env.NOLLUP;
const isWatch = !!process.env.ROLLUP_WATCH;
const isLiveReload = !!process.env.LIVERELOAD;
const isDev = isWatch || isLiveReload;
const isProduction = !isDev;
const isHot = isWatch && !isLiveReload;
function serve() {
let server;
function toExit() {
if (server) server.kill(0);
}
return {
name: 'svelte/template:serve',
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: 'src/main.js',
output: {
sourcemap: true,
format: 'iife',
name: 'app',
file: 'public/build/bundle.js',
},
plugins: [
svelte({
// enable run-time checks when not in production
dev: !isProduction,
// we'll extract any component CSS out into
// a separate file - better for performance
// NOTE when hot option is enabled, a blank file will be written to
// avoid CSS rules conflicting with HMR injected ones
css: css => {
css.write(isNollup ? 'build/bundle.css' : 'bundle.css');
},
hot: isHot && {
// Optimistic will try to recover from runtime
// errors during component init
optimistic: true,
// Turn on to disable preservation of local component
// state -- i.e. non exported `let` variables
noPreserveState: false,
// See docs of rollup-plugin-svelte-hot for all available options:
//
// https://github.com/rixo/rollup-plugin-svelte-hot#usage
},
}),
// 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/plugins/tree/master/packages/commonjs
resolve({
browser: true,
dedupe: ['svelte'],
}),
commonjs(),
// In dev mode, call `npm run start` once
// the bundle has been generated
isDev && !isNollup && serve(),
// Watch the `public` directory and refresh the
// browser on changes when not in production
isLiveReload && livereload('public'),
// If we're building for production (npm run build
// instead of npm run dev), minify
isProduction && terser(),
hmr({
public: 'public',
inMemory: true,
// Default host for the HMR server is localhost, change this option if
// you want to serve over the network
// host: '0.0.0.0',
// You can also change the default HMR server port, if you fancy
// port: '12345'
// This is needed, otherwise Terser (in npm run build) chokes
// on import.meta. With this option, the plugin will replace
// import.meta.hot in your code with module.hot, and will do
// nothing else.
compatModuleHot: !isHot,
}),
],
watch: {
clearScreen: false,
},
};