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Next-generation ES module bundler ported for Deno

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<p align="center">
  <h1 align="center">deno-rollup</h1>
</p>
<p align="center">
Next-generation ES module bundler for <a href="https://deno.land/">Deno</a> ported from <a href="https://github.com/rollup/rollup">Rollup</a>.</p>
<p align="center">
   <a href="https://github.com/cmorten/deno-rollup/tags/"><img src="https://img.shields.io/github/tag/cmorten/deno-rollup" alt="Current version" /></a>
   <img src="https://github.com/cmorten/deno-rollup/workflows/Test/badge.svg" alt="Current test status" />
   <a href="https://doc.deno.land/https/deno.land/x/drollup/mod.ts"><img src="https://doc.deno.land/badge.svg" alt="Deno docs" /></a>
   <a href="http://makeapullrequest.com"><img src="https://img.shields.io/badge/PRs-welcome-brightgreen.svg" alt="PRs are welcome" /></a>
   <a href="https://github.com/cmorten/deno-rollup/issues/"><img src="https://img.shields.io/github/issues/cmorten/deno-rollup" alt="deno-rollup issues" /></a>
   <img src="https://img.shields.io/github/stars/cmorten/deno-rollup" alt="deno-rollup stars" />
   <img src="https://img.shields.io/github/forks/cmorten/deno-rollup" alt="deno-rollup forks" />
   <img src="https://img.shields.io/github/license/cmorten/deno-rollup" alt="deno-rollup license" />
   <a href="https://github.com/cmorten/deno-rollup/graphs/commit-activity"><img src="https://img.shields.io/badge/Maintained%3F-yes-green.svg" alt="deno-rollup is maintained" /></a>
</p>
<p align="center">
   <a href="https://deno.land/x/drollup"><img src="https://img.shields.io/endpoint?url=https%3A%2F%2Fdeno-visualizer.danopia.net%2Fshields%2Flatest-version%2Fx%2Fdrollup%2Fmod.ts" alt="deno-rollup latest /x/ version" /></a>
   <a href="https://github.com/denoland/deno/blob/main/Releases.md"><img src="https://img.shields.io/badge/deno-^1.11.4-brightgreen?logo=deno" alt="Minimum supported Deno version" /></a>
   <a href="https://deno-visualizer.danopia.net/dependencies-of/https/deno.land/x/drollup/mod.ts"><img src="https://img.shields.io/endpoint?url=https%3A%2F%2Fdeno-visualizer.danopia.net%2Fshields%2Fdep-count%2Fx%2Fdrollup%2Fmod.ts" alt="deno-rollup dependency count" /></a>
   <a href="https://deno-visualizer.danopia.net/dependencies-of/https/deno.land/x/drollup/mod.ts"><img src="https://img.shields.io/endpoint?url=https%3A%2F%2Fdeno-visualizer.danopia.net%2Fshields%2Fupdates%2Fx%2Fdrollup%2Fmod.ts" alt="deno-rollup dependency outdatedness" /></a>
   <a href="https://deno-visualizer.danopia.net/dependencies-of/https/deno.land/x/drollup/mod.ts"><img src="https://img.shields.io/endpoint?url=https%3A%2F%2Fdeno-visualizer.danopia.net%2Fshields%2Fcache-size%2Fx%2Fdrollup%2Fmod.ts" alt="deno-rollup cached size" /></a>
</p>

---

**Deprecation Notice**: _Deno now supports a [`--compat` flag](https://github.com/denoland/deno/issues/12295) that allows for the running of Node modules in Deno through the [Node compatibility layer](https://deno.land/std@0.129.0/node). See the [official Rollup docs on Deno usage](https://rollupjs.org/guide/en/#deno)._

_From [Deno 1.25 there is also has support for using NPM specifiers](https://deno.com/blog/v1.25#experimental-npm-support):_

```ts
import { rollup } from "npm:rollup";
```

```console
deno run --unstable --allow-env --allow-read --allow-write npm:rollup
```

_This renders the core and CLI parts of this module obsolete._

_Future efforts will be spent bolstering the Node compatibility layer instead of keeping this module aligned with Rollup for Node._

---

## Table of Contents

- [Overview](#overview)
- [Installation](#installation)
- [Documentation](#documentation)
- [Plugins](#plugins)
- [Examples](#examples)
- [Contributing](#contributing)
- [License](#license)

## Overview

[Rollup](https://github.com/rollup/rollup) is a module bundler for JavaScript
which compiles small pieces of code into something larger and more complex, such
as a library or application.

This library extends Rollup so that it can be used in Deno - supporting core
Deno features out-of-the-box such as URL imports, Typescript and JSX.

## Installation

deno-rollup can be used either through a
[command line interface (CLI)](https://rollupjs.org/guide/en/#command-line-reference)
with an optional configuration file, or else through its
[JavaScript API](https://rollupjs.org/guide/en/#javascript-api).

### CLI

To install the CLI run:

```console
deno install -f -q --allow-read --allow-write --allow-net --allow-env --unstable https://deno.land/x/drollup@2.58.0+0.20.0/rollup.ts
```

And follow any suggestions to update your `PATH` environment variable.

You can then use the CLI to bundle your modules:

```console
# compile to an ESM
rollup main.js --format es --name "myBundle" --file bundle.js
```

You can also rebuild the bundle when it's source or config files change on disk
using the `--watch` flag:

```console
# recompile based on `rollup.config.ts` when source files change
rollup -c --watch
```

### JavaScript API

You can import deno-rollup straight into your project to bundle your modules:

```ts
import { rollup } from "https://deno.land/x/drollup@2.58.0+0.20.0/mod.ts";

const options = {
  input: "./mod.ts",
  output: {
    dir: "./dist",
    format: "es" as const,
    sourcemap: true,
  },
};

const bundle = await rollup(options);
await bundle.write(options.output);
await bundle.close();
```

Or using the `watch` API:

```ts
import { watch } from "https://deno.land/x/drollup@2.58.0+0.20.0/mod.ts";

const options = {
  input: "./src/mod.ts",
  output: {
    dir: "./dist",
    format: "es" as const,
    sourcemap: true,
  },
  watch: {
    include: ["src/**"],
  },
};

const watcher = await watch(options);

watcher.on("event", (event) => {
  // event.code can be one of:
  //   START        — the watcher is (re)starting
  //   BUNDLE_START — building an individual bundle
  //                  * event.input will be the input options object if present
  //                  * event.outputFiles contains an array of the "file" or
  //                    "dir" option values of the generated outputs
  //   BUNDLE_END   — finished building a bundle
  //                  * event.input will be the input options object if present
  //                  * event.outputFiles contains an array of the "file" or
  //                    "dir" option values of the generated outputs
  //                  * event.duration is the build duration in milliseconds
  //                  * event.result contains the bundle object that can be
  //                    used to generate additional outputs by calling
  //                    bundle.generate or bundle.write. This is especially
  //                    important when the watch.skipWrite option is used.
  //                  You should call "event.result.close()" once you are done
  //                  generating outputs, or if you do not generate outputs.
  //                  This will allow plugins to clean up resources via the
  //                  "closeBundle" hook.
  //   END          — finished building all bundles
  //   ERROR        — encountered an error while bundling
  //                  * event.error contains the error that was thrown
});

// This will make sure that bundles are properly closed after each run
watcher.on("event", (event) => {
  if (event.code === "BUNDLE_END") {
    event.result.close();
  }
});

// stop watching
watcher.close();
```

## Documentation

Please refer to the official [Rollup Documentation](https://rollupjs.org).

Known deviations from Rollup:

- Deno code support: TypeScript and URL imports supported out-of-the-box.
- CLI does not currently support some nested "dot" flags, namely:
  `--no-treeshake.*`, `--watch.*` and `--no-watch.*`.
- CLI does not currently support the `--plugin` flag.
- Some warnings have yet to be implemented.

Where further deviations / incompatibility are found, please raise an issue.

## Plugins

A suite of deno-rollup compatible plugins are available in the
[plugins](./plugins) directory.

## Examples

To run the [examples](./examples) you have a couple of options:

### Direct from repository

1. Run the deno-rollup `helloDeno` example directly from the repository:

```console
   deno run --allow-read="./" --allow-write="./dist" --allow-net="deno.land" --allow-env --unstable https://deno.land/x/drollup@2.58.0+0.20.0/examples/helloDeno/rollup.build.ts
   ```

This will create a `./dist` directory with the bundled files in your current
   working directory.

### Clone

1. Clone the deno-rollup repo locally:

```bash
   git clone git://github.com/cmorten/deno-rollup.git --depth 1
   cd deno-rollup
   ```

2. Then enter the desired examples directory and run the build script:

```bash
   cd examples/helloDeno
   deno run --allow-read="./" --allow-write="./dist" --allow-net="deno.land" --allow-env --unstable ./rollup.build.ts
   ```

This will create a `./dist` directory with the bundled files in the current
   directory.

3. Further details are available in each example directory.

## Contributing

[Contributing guide](https://github.com/cmorten/deno-rollup/blob/main/.github/CONTRIBUTING.md)

---

## License

deno-rollup is licensed under the [MIT License](./LICENSE.md).

The license for the Rollup library, which this library adapts, is available at
[ROLLUP_LICENSE](./ROLLUP_LICENSE.md).

Derived works other than from [Rollup](https://github.com/rollup/rollup) are
attributed with their license in source.

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