rollup-plugin-conditional-exec

⚙️🚀 Execute commands after writing a bundle with optionally provided conditions

This package facilitates executing a given command after a bundle has been written by Rollup. The timing of the execution of the given command can be leveraged by providing a condition to satisfy before performing the command.

For example, if you are a Vite user and you generate bundled code for es & umd, you can write a condition function in your vite.config.ts that will only return true once both values have been observed, as Vite will run rollup twice to generate both of these.

I built this primarily so that after each successful bundle had been generated, yalc push would be called.

Usage

Create a rollup.config.js configuration file and import this plugin:

import conditionalExec from "rollup-plugin-conditional-exec";

export default {
  input: "src/index.js",
  output: {
    file: "dist/index.js",
    format: "cjs",
  },
  plugins: [
    conditionalExec({
      command: "yalc push",
    }),
  ],
};

Options

Typings for the options are available by importing RollupConditionalExecOptions.

command

Type: string Required: true

This is the command you want to be executed after a bundle has been written.

options

Type: object Default: { stdio: "inherit" }

See CommonExecOptions for available options.

If an options object is provided, it will override the default.

condition

Type: () => Promise<boolean> | boolean | (outputOpts: OutputOptions) => Promise<boolean> | boolean Default: () => true

Provide an optional condition to satisfy before a given command is executed. The condition command is passed in the OutputOptions that are give to writeBundle to allow you to leverage build time specific options. i.e. which bundle you are currently generating in a series of bundling operations.

afterExec

Type: () => Promise<void> | void Default: () => undefined

Provide an optional function to be executed after the command has been executed successfully. This can allow you to tidy up state, where you need to reset a state between bundles when running in a build watch mode or similar.

onError

Type: (error: Error) => Promise<void> | void Default:

(error: Error) => {
  console.error(`Exec has failed: ${error.message}`);
  console.debug(error.stack);
  throw error;
};

Provide an optional function to be executed should your provided command fail to execute successfully. By default, this will log your error and then rethrow the error to prevent a silent failure.

How it works

This plugin leverages the following hooks provided by Rollup

• Build Hooks
  • buildStart
    • An assertion is completed here to validate that the command itself is both provided and not an empty string.
• Output Generation Hooks
  • writeBundle
    • It is at this stage that commands are executed via Nodes exec function.

Simplified Flow of used hooks

┌──────────────── Rollup ────────────────┐
│                                        │
│                                        │
│   ┌──────────────┐                     │
│   │  buildStart  │                     │
│   └───────┬──────┘                     │
│           │                            │
│           │                            │
│           ▼                            │
│   ┌──────────────┐                     │
│   │  Assert cmd  │                     │
│   │              ├─── false ──┐        │
│   │  is defined  │            │        │
│   └───────┬──────┘            │        │
│           │                   │        │
│           │                   │        │
│         true                  │        │
│           │                   ▼        │
│           ▼              ┌─────────┐   │
│   ┌───────────────┐      │  Fail   │   │
│   │  writeBundle  │      │         │   │
│   └───────┬───────┘      │  Build  │   │
│           │              └─────────┘   │
│           │                   ▲        │
│           ▼                   │        │
│     ┌───────────┐             │        │
│     │  execute  │             │        │
│     │           ├──── error ──┘        │
│     │  command  │                      │
│     └─────┬─────┘                      │
│           │                            │
│           │                            │
│        success                         │
│           │                            │
│           │                            │
│           ▼                            │
│    ┌─────────────┐                     │
│    │  Completed  │                     │
│    └─────────────┘                     │
│                                        │
│                                        │
└────────────────────────────────────────┘