Rollup Plugin Commands

Configurable Rollup plugin to run async functions in sequence. Also provides a shell command for convenience.

Features:

• Runs one or more commands in sequence, waiting for each to finish
• Run commands when Rollup calls generateBundle or writeBundle, as specified by options
• Each command is passed the parameters outputOptions and bundle that are passed to the plugin
• Run commands only once, or each time Rollup calls generateBundle or writeBundle
• Run async or synchronous functions
• Run shell commands with parameters in a single string (i.e. 'npm test'), courtesy execa and cross-spawn.

Installation

Using npm:

npm install --save-dev @toolbuilder/rollup-plugin-commands

Use

If you want just the plugin, but not the shellCommand, import like this:

import runCommands from '@toolbuilder/rollup-plugin-commands'

If you want the shellCommand, import like this:

import runCommands, { shellCommand } from '@toolbuilder/rollup-plugin-commands'

Alternately, import like this if you don't like the syntax above:

import { runCommands, shellCommand } from '@toolbuilder/rollup-plugin-commands'

Example

The Rollup config rollup.test.config.js tests the pack file for this package. It uses @toolbuilder/rollup-plugin-commands to install dependencies and run the tests in a temporary directory.

API

shellCommand

This function creates an async function that executes a shell command with option { stdio: 'inherit' } so that the output is part of the Rollup stream. It uses execa to execute the script. If the script does not return 0, an exception is thrown.

Typical use of shellCommand looks like this:

import runCommands, { shellCommand } from '@toolbuilder/rollup-plugin-commands'

export default [{
  /* other configuration here */
  plugins: [
    runCommands({
      commands: [
        shellCommand(`npm pack`) // runs when 'writeBundle' is called
      ]
    })
  ]
}]

RunCommands

The plugin does nothing without options. The plugin exposes two methods for Rollup to call: writeBundle and generateBundle. At the appropriate point in Rollup's workflow, these methods will be called with two parameters: outputOptions and bundle. Depending on your Rollup configuration, these methods may be called more than once. You can control how this plugin behaves with options.

Option parameters are as follows:

commands

• Type: [Function|AsyncFunction]
• Default: []

The commands option specifies the commands you want to run. They are run in the sequence provided, and each function must finish before the next function is called. Each function is called with the outputOptions and bundle parameters passed to the plugin by Rollup. If a function throws, the thrown value is passed to Rollup's context function (i.e. this.error(yourError)) so that Rollup reports it normally. However, the command is not passed Rollup's context object - you might as well write your own plugin if you want that.

If you want to run async functions in parallel, just call them from sync functions that do not return the Promise.

const options = {
  commands: [
    async (outputOptions, bundle) => "do something async",
    () => "do something sync next"
  ]
}

runOn

• Type: String
• Default: writeBundle

Set the runOn option to generateBundle if you want to run the commands when Rollup calls that method. Depending on the option value, the commands will be run either when writeBundle is called or when generateBundle is called - not both times. If you want to run for both writeBundle and generateBundle, use two plugin instances.

const options = {
  runOn: 'generateBundle' // tells plugin to run commands when Rollup calls generateBundle
}

once

• Type: Boolean
• Default: true

Set this option to false if you want to run the commands every time the function you selected (either generateBundle or writeBundle) is called. The rest of your Rollup configuration determines how many times this happens.

const options = {
  once: false
}

Contributing

Contributions are welcome. Please create a pull request or write up an issue. This package uses the pnpm package manager. Run pnpm run check to run all the unit tests and validation scripts.

npm install -g pnpm
pnpm install
pnpm run check

Issues

This project uses Github issues.

License

MIT