parcel

1. Basic Parcel Configuration

const { ParcelBundler } = require('parcel-bundler');

const bundler = new ParcelBundler('index.html', {});

bundler.bundle();

2. Using a Custom Output Path

const { ParcelBundler } = require('parcel-bundler');

const bundler = new ParcelBundler('index.html', {
  outFile: 'dist/index.html',
});

bundler.bundle();

3. Serving Static Files

const express = require('express');
const { ParcelMiddleware } = require('parcel-bundler');

const app = express();
app.use(ParcelMiddleware({
  publicUrl: '/',
  outDir: './dist',
}));

app.listen(3000);

4. Including CSS and JS

<html>
<head>
  <link rel="stylesheet" href="/dist/index.css">
</head>
<body>
  <script src="/dist/index.js"></script>
</body>
</html>

5. Using Tailwind.css with Parcel

const { ParcelConfig } = require('parcel-bundler');
const tailwindcss = require('tailwindcss');
const postcss = require('postcss');

const parcelConfig = new ParcelConfig();

parcelConfig.addTransformer('css', async function (source, options) {
  const result = await postcss([tailwindcss()]).process(source);
  return result.css;
});

6. Building a Production Bundle

const { ParcelBundler } = require('parcel-bundler');

const bundler = new ParcelBundler('index.html', {
  env: 'production',
});

bundler.bundle();

7. Using a Polyfill

const { ParcelConfig } = require('parcel-bundler');
const autoprefixer = require('autoprefixer');
const postcss = require('postcss');

const parcelConfig = new ParcelConfig();

parcelConfig.addTransformer('css', async function (source, options) {
  const result = await postcss([autoprefixer()]).process(source);
  return result.css;
});

8. Bundling SVGs

<img src="./icon.svg">

9. Using Babel

const { ParcelConfig } = require('parcel-bundler');
const babelCore = require('@babel/core');

const parcelConfig = new ParcelConfig();

parcelConfig.addTransformer('js', async function (source, options) {
  const result = await babelCore.transformAsync(source, { presets: ['@babel/preset-env'] });
  return result.code;
});

10. Using TypeScript

const { ParcelConfig } = require('parcel-bundler');
const ts = require('typescript');

const parcelConfig = new ParcelConfig();

parcelConfig.addTransformer('ts', async function (source, options) {
  const result = ts.transpile(source);
  return result;
});

11. Bundling JSON

<script>
  const data = require('./data.json');
</script>

12. Using a Custom Plugin

const { ParcelBundler, transformers } = require('parcel-bundler');

const MyPlugin = {
  apply(bundler) {
    bundler.addAssetType('.my-extension', transformers.raw);
  },
};

const bundler = new ParcelBundler('index.html', { plugins: [MyPlugin] });

13. Watching for File Changes

const { ParcelBundler } = require('parcel-bundler');

const bundler = new ParcelBundler('index.html', { watch: true });

bundler.bundle();

14. Using a Custom Cache Directory

const { ParcelBundler } = require('parcel-bundler');

const bundler = new ParcelBundler('index.html', { cacheDir: './my-cache' });

bundler.bundle();

15. Using a Custom Resolver

const { ParcelConfig } = require('parcel-bundler');
const { NodeResolver } = require('@parcel/node-resolver');

const parcelConfig = new ParcelConfig();

parcelConfig.resolvers.unshift(new NodeResolver({ root: './node_modules' }));

16. Using a Custom Query String

const { ParcelBundler } = require('parcel-bundler');

const bundler = new ParcelBundler('index.html', {
  query: 'development=true',
});

bundler.bundle();

17. Using a Custom URL Prefix

const { ParcelBundler } = require('parcel-bundler');

const bundler = new ParcelBundler('index.html', {
  publicUrl: '//cdn.example.com',
});

bundler.bundle();

18. Using a Custom Source Map

const { ParcelBundler } = require('parcel-bundler');

const bundler = new ParcelBundler('index.html', {
  sourceMaps: true,
});

bundler.bundle();

19. Using a Custom Transform

const { ParcelConfig } = require('parcel-bundler');
const { Transform } = require('stream');

const parcelConfig = new ParcelConfig();

parcelConfig.addTransformer('js', async function (source, options) {
  return new Transform({
    transform(chunk, encoding, callback) {
      callback(null, chunk.toString().toUpperCase());
    },
  });
});

20. Using a Custom Webpack Loader

const { ParcelConfig } = require('parcel-bundler');
const { WebpackLoader } = require('@parcel/webpack-loader');

const parcelConfig = new ParcelConfig();

parcelConfig.addTransformer('js', new WebpackLoader({
  loaders: [
    {
      loader: 'babel-loader',
      options: {
        presets: ['@babel/preset-env']

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