@mprt/rollup-plugin-incremental

A Rollup plugin which makes your (development) builds much faster, by recompiling only changed modules.

Requirements

This plugin requires at least rollup@2.33.1

Install

Using yarn or npm:

yarn add -D @mprt/rollup-plugin-incremental

npm install @mprt/rollup-plugin-incremental --save-dev

Usage

//some imports ...
import incremental from '@mprt/rollup-plugin-incremental'

export default {
    input: 'src/index.js',
    //ATTENTION: treeshaking must be disabled!
    treeshake: false,
    //ATTENTION: there is must be only one output! 
    output: {
        dir: 'dist',
        format: 'esm',
        //ATTENTION: preserveModules must be enabled!
        preserveModules: true,
        preserveModulesRoot: 'src',
        //ATTENTION: minifyInternalExports must be disabled!
        minifyInternalExports: false,
    },
    plugins: [
        //ATTENTION: plugin very likely should be first!
        //BTW, this plugin is noop without watch mode 
        incremental(),  
        
        //another plugins...
        
        //ATTENTION: this fixes issues with syntheticNamedExports in commonjs modules
        //it should be last 
        incremental.fixSNE(),
    ],
}

And then...

rollup -cw

There is simple typical ts, react and mobx web app in example folder.

First build will take same time as usual, but second and next builds should be really fast - below a second.

Gotchas

• If changed file is not directly transpiles to module (ie: some babel config), then full rebuild triggered.
• If error occurs during incremental build, all changed modules will be rebuild again on next build
• Currently it works by replacing input option on incremental builds, so it cannot work with another plugins which works with input, i.e. multi-entry plugin

Inter-plugin API

This plugin exposes next API:

interface IncrementalAPI {
    /** Is current (or last, if there is no current) build is incremental? */
    readonly incrementalBuild: boolean 
    /** Ids of changed modules, which triggers incremental build. Null if build is not incremental */
    readonly changedModules: null | Set<string>
}