Plugins

Bunup's plugin system allows you to extend its functionality. The plugins option accepts both Bun's native bundler plugins and Bunup-specific plugins.

Plugin Types

Bunup supports two types of plugins:

1. Bun Plugins - Native Bun plugins that are passed directly to Bun's bundler
2. Bunup Plugins - Custom plugins with additional lifecycle hooks

You can use both types together in the same configuration.

Using Bun Plugins

Any Bun plugin can be used with Bunup. These plugins are passed directly to Bun's native bundler:

bunup.config.ts

import { defineConfig } from "bunup";
import type { BunPlugin } from "bun";

const myBunPlugin: BunPlugin = {
	name: "my-plugin",
	setup(build) {
		// Bun plugin setup
	},
};

export default defineConfig({
	entry: "src/index.ts",
	plugins: [myBunPlugin],
});

Using Bunup Plugins

Bunup plugins provide additional hooks into the build process:

bunup.config.ts

import { defineConfig, type BunupPlugin } from "bunup";

const myBunupPlugin: BunupPlugin = {
	name: "my-bunup-plugin",
	hooks: {
		onBuildStart(options) {
			// Called before build starts
		},
		onBuildDone(context) {
			// Called after build completes
		},
	},
};

export default defineConfig({
	entry: "src/index.ts",
	plugins: [myBunupPlugin],
});

Built-in Plugins

Bunup provides several built-in plugins:

• Copy - Copy files and directories to your build output
• Tailwind CSS - Official Tailwind CSS v4 plugin
• ...and more

Example usage:

bunup.config.ts

import { defineConfig } from "bunup";
import { copy } from "bunup/plugins";

export default defineConfig({
	entry: "src/index.ts",
	plugins: [copy(["README.md", "assets/**/*"])],
});

Plugin Development

To learn how to create your own Bunup plugins, see the Plugin Development Guide.